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ACIS Checker

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The ACIS checking functionality ("the Checker") is provided to help customers to detect bad data or invalidities in their models. ACIS operations are not designed to work on invalid models, therefore correct use of the Checker by customers is essential to maximize the robustness of ACIS-based products.

The architecture that this is designed around is that applications will read ACIS data from an outside source (for instance reading a SAT file), then use the Checker to identify problems within that data. Any invalid entities that are detected should then be discarded or repaired. At the end of this process, the application should have a model free of any known defects, and ACIS operations can then be called with confidence.

The standard customer interface to the Checker is api_check_entity, although some more specific API and direct-interface functions are available for certain types of data. An entity is considered to be defective if ERROR-status problems are detected when the entity is processed by api_check_entity at its highest level. If the Checker detects ERROR-status problems with a given entity, the behavior of other ACIS operations on this entity cannot be guaranteed - the operation may fail, or produce an incorrect result.

The purpose of api_check_entity means that it is not subject to the standard rules on the behavior of ACIS API functions:

• api_check_entity is expected not to fail (return an unsuccessful outcome), regardless of errors in the input data. api_check_entitys function is to detect and report errors in the input data, so its algorithms do not work on the input data in the same way as modeling operations.
• As of release R14, api_check_entity is versioned. When implementing feature-based modeling, versioning allows you to rebuild old parts using previous versions of ACIS algorithms. Although generally performing checks during a legacy rebuild operation is not usually necessary, versioning ensures that the check results for a given legacy rebuild is maintained as the application is migrated to newer versions of ACIS. Note that this is the only time when a versioned check should be performed. A part for which checking discovers no errors at a particular version is not "valid" for that version. If check errors are reported when the part is checked as the current version, then the part is defective, and operations at any version cannot be relied upon for that part.

Refer to the Example Code for api_check_entity for a working example.

Using the Checker

As mentioned above, ACIS data should be checked on read-in and repaired before modeling commences. Ensuring that ACIS operations are only called on valid models allows the overall performance of ACIS to be maximized. If ACIS operations can assume their input data is valid, they do not need to spend time performing validation checks, needlessly slowing down algorithms when the input is in fact valid.

You are advised against including the ACIS checking functionality as part of their modeling workflow, because

• ACIS operations are expected to produce a valid result if applied to a valid model, so subsequent checking should not be necessary, provided the model was good to begin with. This approach improves application performance because repeated checking is avoided.
• With continual improvements to the Checker, it is possible for previously undetected defects in a model to become apparent. Therefore, the behavior of algorithms dependent on results from the Checker would be unpredictable.

Interpreting Results from the Checker

The output from a call to api_check_entity consists of a list of zero or more objects of type insanity_list. Each of these objects represents a single problem with the input entity identified by the Checker, specifying the severity of the problem, the particular problem identified, and the entity exhibiting the problem. Note that as most entities own other sub-entities, the entities returned in the list are typically not the input entity. For instance, a body may contain a face made from an invalid surface; in this case, the insanity_list data will indicate the face made from the invalid surface, the reason the surface is invalid, and the severity of the problem.

An insanity_list can be converted into an error_info_list by using the helper function convert_insanity_list_into_error_info_list. Refer to the section Error Handling.

Checking Problem Severities

Each problem returned by api_check_entity is classified as being of one of four different severities: ERROR, WARNING, NOTE and INFO.

The most serious problems are classified as ERROR severity. As stated above, these represent issues that the algorithms in ACIS are not designed to handle, and unpredictable results and failures can be expected if applications attempt to work with ACIS using entities with such problems. Of course, it is not true that all operations on invalid entities will fail or produce incorrect results, but great care must be taken when doing this. Because the ACIS philosophy is that operations are performed on valid data, their algorithms are not designed to treat invalid data consistently. An important consequence is that as algorithms are changed between versions of ACIS, the result of attempting a particular operation on a particular invalid entity may change too.

Because of the different ways that a geometric model data can be invalid, it is unfortunately not possible to state definitively which problems will cause which operations to fail, or which algorithms are not affected by certain problems.

The WARNING category covers properties of the data that are highly undesirable and can upset certain algorithms. An example would be that a curve is found to be non-C1. Most operations in ACIS are not reliant on curves having C1 or better continuity, but the algorithms to compute area and mass properties of bodies do rely on the curve geometry having this property (refer to the section Continuity Requirements), and therefore applications wanting to use these algorithms should use the Checker to ensure that this continuity requirement is met. As with ERROR-severity problems, it is not possible to state definitively which warning-status problems will affect which operations.

The NOTE and INFO severities indicate properties of the data that may not be ideal from the point of view of ACIS, but which should not cause operations to fail or produce incorrect results.

It is possible to control whether the checks that produce warning messages are performed or not by using the show_warning_msg option. This can be used to reduce the time taken to check an entity if the application is not interested in WARNING-severity problems.

Checking Levels

Users have some control over how much work the Checker performs by setting the value of the check_level option. The range of effective values for this option is any value multiple of ten between ten and seventy inclusive, and the default value is twenty. The higher the number, the more checks the Checker will perform.

It appears to be a commonly held belief within the ACIS community that the lower level checks (levels 20 and 30) are the important checks, regardless of the severity of the problem reported. This is, however, incorrect. The allocation of checks to particular levels is governed by the computational expense of performing the check, rather than the severity of the problem checked for. There are a few exceptions to this rule. The most significant exception is that curve and surface self-intersection checks are made at level 30 or higher, even though they are very computationally expensive. This is because self-intersecting geometry is commonly encountered, and most of the time such a model is not usable in an application context.

Note:  If an operation fails on a part which the Checker reveals to have ERROR-severity problems, Spatial does not normally view the failure of the operation to be a bug.

Fixing Errors

Some of the problems detected by the checker are inconsistencies in ACIS data structures or incorrect derived values. Some of these problems can be corrected by an automatic repair algorithm. The function api_fix_check_problems is provided to perform such repairs when possible.

api_fix_check_problems is not intended to provide general healing functionality. Its purpose is to "tidy up" minor flaws in data that do not affect the shape or construction of the model, but could cause difficulties when operations are performed using that data. As such, it does not guarantee to correct any particular problem, because it may be that in a particular situation a correction would require significant alterations to be made to the geometry or topology of the model.

Other Options Influencing Checking Behavior

Several other options exist which influence the behavior of the Checker. Most of these exist in order to allow particular time-consuming checks which are normally only performed at high check levels to be made even if the check level is low.

checker_limit - Using this option allows to limit the number of checker errors obtained by an api_check_entity call. As soon as the specified limit is reached, the entity checking is aborted. This option is especially useful for parts containing many problems because obtaining all the errors can be expensive. In many cases addressing subsets of errors improves the part in general. By default this option is set to 0 and all checker errors are obtained.

check_abort - Turning this option on causes checking to be abandoned as soon as a problem is detected with the entity. This allows the checking of a set of entities to be performed as quickly as possible, when the intention is to simply discard any invalid entities in the set, so the precise number and types of problem that entities have is not relevant. Note that the discovery of a problem of any severity (not just ERROR-severity) will cause checking of the entity to be terminated. By default, this option is turned off.

check_ff_int - If this option is turned on, face-face intersection checks are performed whatever the setting of check_level. If it is turned off, face-face intersection checks are only performed at level 70. By default, this option is turned off.

check_discont - Turning on this option activates checking of the discontinuity information stored for curves and surfaces, which is otherwise not performed. By default, this option is turned off.

check_edge_on_face - Turning on this option activates a detailed check of whether the edges of a face are coincident with its surface, which is otherwise not performed. By default, this option is turned off.

r14_checks - Turning this option on activates the new checks that have been introduced in release R14. However, the new checks are not "optional"; parts for which problems are reported when r14_checks is enabled are defective. Failure of an ACIS operation on a part exhibiting such faults is not regarded as a bug. To reduce disruption when migrating to a new version of ACIS, this option has a default value of false in R14 and R15. In R16 the default value changes to true. In R17 and beyond the option no longer becomes available and the checks are always enforced. For information on which checks are affected by this option, refer to api_check_entity.

check_surface_irregular_and_selfint - By default this option is turned on and for a given surface both the irregular and self-intersection test are performed. In many cases the caller might not be interested in the self-intersection test, which can be expensive, if the surface was already found to be irregular. To avoid the self-intersection check for an irregular surface, this option should be turned off.

Checking Functionality with Other ACIS Interfaces

Apart from api_check_entity, there are several interfaces to parts of the ACIS checking functionality.

api_check_face and api_check_edge perform geometric checks on a face or an edge, respectively. They are therefore somewhat misnamed, as they do not perform other checks or check the owned geometry (vertices of an edge, or edges, coedges and vertices of a face) of the entity.

api_check_entity_ff_ints performs the same face-face intersection checks that api_check_entity does at level 70, or if the check_ff_int option is turned on.

At the direct interface level, the surface and curve classes have a check() method which can be used to perform geometric checks.

Table. Types of Checks displays all checks performed, and the associated problems that may be reported. Each check problem has a unique integer ID, obtainable via the insanity_data.get_insane_id method. An internal description of the problem, in the form of a string, is obtainable via the insanity_data.get_message method. We do not recommend applications making use of the message strings, particularly for determining workflow. Instead, use the unique integer IDs. For ease of migration to future versions of ACIS, we recommend that applications use the corresponding ID macros, which can be found in insanity.err.

Table. ID Macros displays each ID macro with a detailed description of the problem reported. When reading the information in Table. ID Macros, keep the following points in mind.

• If a basic pointer check fails, then treat it as a fatal topology error. Avoid all operations on that model. With millions of pointer accesses throughout ACIS, it is impossible to detect every invalid access without severely compromising the performance of the modeler. Ideally, the invalid entity should be repaired or removed.
• Take appropriate care when bad geometry is found. The behavior of many fundamental calculations, such as point-in-face and other intersection algorithms, may either fail or produce incorrect results. Such low-level problems propagate to higher-level geometric operations. Thus, avoid all geometric operations involving the bad entities.
• ACIS prefers that curves and surfaces generally be G2 continuous, but allows G1 continuity at the knots of curves and surfaces. Take caution when a non-G1 warning is present. Intersection algorithms may produce bad results and modeling operations such as blending, offsetting and shelling may fail. The evaluation of mass properties in ACIS requires that curves be C1 continuous.
• We do not support or recommend modeling with bad data. We recommend that you repair the bad data before modeling commences.

Table. Types of Checks

Type of Checks	Level	Brief Description	ID Macro	Message	Status
BODY	10+	Basic pointer checks	BODY_WITHOUT_LUMP	Body without lump.	Error
			LUMP_NOT_POINT_TO_BODY	Body's lump does not point to body. Fatal topology error.	Error
		TRANSFORM checks (see below)
		ATTRIB checks (see below)
	50+	Containment check	BODY_FAIL_CONT_CHK	Body fails containment check.	Error
			BODY_WARN_CONT_CHK	Body fails containment check (maybe a void).	Warning
			NO_CONT_CHK	Containment check could not be performed.	Warning
TRANSFORM	10+	Basic consistency checks	TRANSF_LARGE_TRANSLATION	Transform translation is too large.	Error
			TRANSF_NOT_IDENTITY	Matrix of non-rotation, non-reflection transform is not identity.	Error
			TRANSF_NOT_UNIT_VEC	Transform row or column is not a unit vector.	Error
			TRANSF_BAD_REFLECTION	Reflection transform determinant is not -1.0.	Error
			TRANSF_BAD_DETERMINENT (Note: This macro was inadvertently misspelled when created. Please use as documented.)	Transform determinant is not 1.0.	Error
ATTRIB	10+	Basic attribute chain check	ATTRIB_CORRUPT_CHAIN	Attribute chain is corrupt.	Error
			ATTRIB_BAD_OWNER	Attribute owner is not correct.	Error
LUMP	10+	Basic pointer checks	LUMP_WITHOUT_SHL	Lump without shell.	Error
			SHL_NOT_POINT_TO_LUMP	Lump's shell does not point to lump. Fatal topology error.	Error
			LUMP_WITHOUT_BODY	Lump without body.	Error
		ATTRIB checks (see above)
SHELL	10+	Basic pointer checks	SHL_WITHOUT_FACE	Shell without face or wire.	Error
			FACE_NOT_POINT_TO_SHL	Shell's face does not point to shell. Fatal topology error.	Error
			WIRE_NOT_POINT_TO_SHL	Shell's wire does not point to shell. Fatal topology error.	Error
			SHL_WITHOUT_LUMP	Shell without lump.	Error
			SHL_DISCONNECTED	Entities in shell are not connected.	Error
			SHL_MISSING_ENTITIES	Connected entities in shell are not listed.	Error
		ATTRIB checks (see above)
WIRE	10+	Basic pointer checks	WIRE_WITHOUT_COED	Wire without coedge.	Error
			COED_NOT_POINT_TO_WIRE	Wire's coedge does not point to wire. Fatal topology error.	Error
			COED_NEXT_NOT_WELL_CONN	Coedge's next is not well connected.	Error
			COED_PREV_NOT_WELL_CONN	Coedge's previous is not well connected.	Error
			VTX_NO_EDGE	Vertex without edge.	Error
			WIRE_WITHOUT_OWNER	Wire without owner.	Error
			VTX_NOT_SHARED	Sequential coedges do not share vertex.	Error
		ATTRIB checks (see above)
FACE	10+	Basic pointer checks	FACE_WITHOUT_LOOP	Face without loop.	Error
			WRONG_FACE_BACKPTR	Backptr to wrong face.	Error
			FACE_NO_BACKPTR	Face without backptr.	Error
			FACE_NO_SURF1	Face without SURFACE (ENTITY).	Error
			FACE_NO_SURF2	Face without surface (non-ENTITY).	Error
		Parametric range check	BAD_FACE_DOMAIN	U or V range of the face cannot be determined or bad.	Error
		Face box check	TOL_BAD_FACE_BOX	Face box with tolerant topology does not intersect vertex boxes.	Error
			FACE_BOX_TOO_SMALL	Face box too small, does not contain vertices.	Error
		Check on apex of conical face	NULL_EDGE_AT_APEX	Conical face needs NULL edge at apex.	Error
		Check face sense of a non-degenerate torus	TRS_BAD_LOOP	Torus loop seems to be badly oriented.	Error
			ACIS_ERROR	Outcome checks bad.	Error
		Check that the face's edges lie on the face's surface (Note: The option check_edge_on_face must be switched on)	EDGE_OFF_FACE	Edge is not on one of its faces.	Error
			TEDGE_OFF_FACE	Tolerant edge is not on one of its faces.	Error
		SURFACE checks (see below)
		PCURVE checks (see below)
		ATTRIB checks (see below)
	20+	Face area check	FACE_NEGA_AREA	Face with negative area.	Error
			FACE_ZERO_AREA	Face with zero area.	Error
			FACE_AREA_FAILURE	Face area calculation failed.	Error
		Check loops of a non-planar face	UNBOUND_CONE_FACE	Unbounded conical face.	Warning
			BAD_FACE_LOOP	Error in face loop.	Error
		Loop orientation check	FACE_BAD_LOOP_ORIENT	Face has loop with wrong orientation.	Error
			LOOP_ORIENT_CHECK_FAIL	Could not check loop orientation because of problem with loop.	Warning
SURFACE	10+	Form consistency check on an analytic surface	PLN_NORM_NOT_UNITVEC	Plane normal is not a unit vector.	Error
			SPH_ZERO_RAD	Sphere has zero radius.	Error
			CONE_ELL_NORM_NOT_UNITVEC	Cone's ellipse normal is not a unit vector.	Error
			CONE_ELL_ZERO_MAJ_AXIS	Cone's ellipse has zero length major axis.	Error
			CONE_ELL_NOT_PERP_TO_AXIS	Cone's ellipse normal not perpendicular to major_axis.	Error
			CONE_ELL_ZERO_RATIO	Cone's ellipse has zero radius ratio.	Error
			CONE_ELL_RATIO_GT_1	Cone's ellipse has radius ratio greater than 1.0.	Error
			CONE_ANGLE_INCONS	Cone's sine and cosine angle inconsistent.	Error
			TRS_BAD_MAJ_RAD	Torus major radius less than negative of absolute value of minor radius.	Error
			TRS_NORM_NOT_UNITVEC	Torus normal is not a unit vector.	Error
			TRS_ZERO_MAJ_RAD	Torus major radius is zero.	Error
			TRS_ZERO_MIN_RAD	Torus minor radius is zero.	Error
			SUB_SPL_SUR_FOUND	sub_spl_sur found - algorithms using surface extensions may fail.	Warning
		Form consistency check on a procedural surface's approximation	SPLSUR_NO_APPROX	Spline surface has no approximating surface.	Warning
			IRREG_SURF	Surface irregular.	Error
			PROC_SURF_DIFF_APPROX	Procedural surface and its approximation have different forms.	Error
			BS3S_U_NOT_CLOSED	bs3_surface form in u should be 'closed'.	Error
			BS3S_U_NOT_OPEN	bs3_surface form in u should be 'open'.	Error
			BS3S_V_NOT_CLOSED	bs3_surface form in v should be 'closed.'	Error
			BS3S_V_NOT_OPEN	bs3_surface form in v should be 'open'.	Error
			BS3S_U_NOT_PERIODIC	bs3_surface form in u should be 'periodic'.	Warning
			BS3S_V_NOT_PERIODIC	bs3_surface form in v should be 'periodic'.	Error
		ATTRIB checks (see above)
	20+	Non-G1 surface check (Note: This check can be invoked at a lower level by switching on the option d3_checks)	SURF_NOT_G1	Surface not G1.	Warning
			SURF_NOT_G1_NEAR_TAN	Surface near tangent, not G1.	Warning
		Check for unmarked discontinuities (Note: The option check_discont must be switched on. This check can be invoked at a lower level by switching on the option d3_checks.)	SURF_MISSING_DISC_INFO	Surface has unmarked G1 or G2 discontinuities.	Error
	30+	General surface checks (Note: These checks can be invoked at a lower level by switching on the option d3_checks.)	IRREG_SURF	Surface irregular.	Error
			SURF_DATA_MISSING	A vital part of the surface data is missing.	Error
			SURF_DATA_CONFLICTING	Surface data is conflicting.	Error
			SURF_SEFL_INT (Note: This macro was inadvertently misspelled when created. Please use as documented.)	Surface self-intersects.	Error
			BAD_CLOSURE	Surface closure wrong.	Error
			NO_BS3SURF	No underlying bs3_surface.	Error
			BAD_CTL_PNT_COIN	Error in control point coincidence.	Error
			SURF_BAD_DEGEN	Bad degeneracy in surface.	Error
			BAD_SINGULAR	Untreatable singularity in surface.	Error
			SURF_NOT_G0	Surface not G0.	Error
			SURF_NOT_G2	Surface not G2.	Warning
			SURF_NOT_C1	Surface not C1.	Warning
			SURF_BAD_APPROX	Surface approximation is bad.	Error
			BAD_VERTEX_BLEND	Vertex blend surface is illegal.	Error
			BAD_SUBSET_RANGE	Bad Subset range.	Error
			SUBSET_RANGE_MODIFIED	Bad Subset range corrected by checker.	Warning
			BAD_ROLLING_BALL_BLEND	Rolling-ball blend surface is illegal.	Error
			SURF_BAD_FITOL	Approximating surface is not within stated tolerance of true surface.	Error/Warning
			UNEXPECTED_PROBLEM	Problem not properly handled in the checker detected.	Warning
	40+	Degenerate spline surface check	COED_START_VTX_ON_POLE	Coedge's start vertex lies on pole of surface.	Warning
			COED_END_VTX_ON_POLE	Coedge's end vertex lies on pole of surface.	Warning
PCURVE	10+	Basic checks	COED_NO_PCUR	Coedge on spline surface has no PCURVE.	Error
			PCUR_NO_CUR	Pcurve has no defining curve.	Error
		Non-tolerant COEDGE checks	COED_RANGE_NOT_CONT_1	Small difference in pcurve's and coedge's range can be neglected.	Warning
			COED_RANGE_NOT_CONT	Pcurve's range does not include coedge's range.	Error
			PCUR_OUT_OF_RANGE	Pcurve is a period outside of face range.	Error
			INCONS_DIR	Pcurve direction != coedge direction.	Error
			PCUR_DIFF_LOC	Pcurve location != coedge location.	Error
			PCUR_CURVE_EVAL_FAILURE	Could not complete pcurve checking due to curve problems.	Warning
			PCUR_EVAL_PROB	There is a problem with the pcurve eval.	Error
		ATTRIB checks (see above)
	30+	TCOEDGE checks	START_INCONS_TOL_GEOM	Geometry at start of TCOEDGE and TEDGE appear inconsistent.	Error
			END_INCONS_TOL_GEOM	Geometry at end of TCOEDGE and TEDGE appear inconsistent.	Error
			TOL_GEOM_INCOMPATIBLE	TCOEDGE and TEDGE geometry appear to be incompatible.	Error
	40+	Compatibility check between surface and pcurve's surface	PCUR_SURF_DIFF	Pcurve's surface different from coedge's.	Error
		Form consistency check between pcurve and edge curve,for example, periodicity, closure.	PCUR_PEROID_DIFF_INTCUR (Note: This macro was inadvertently misspelled when created. Please use as documented.)	Periodic pcurve has different form from INTCURVE.	Warning
			PCUR_CLOSED_DIFF_INTCUR	Closed pcurve has different form from INTCURVE.	Warning
			PCUR_OPEN_DIFF_INTCUR	Open pcurve has different form from INTCURVE.	Warning
			PCUR_UNKNOWN_FORM	Pcurve with unknown form.	Error
			PCUR_NOT_PERIODIC	Pcurve not periodic on periodic ELLIPSE curve.	Warning
			PCUR_NOT_CLOSED	Pcurve not closed on closed ELLIPSE curve.	Warning
			PCUR_NOT_OPEN	Pcurve not open on open ELLIPSE curve.	Warning
			PCUR_NOT_OPEN_ON_STR	Pcurve not open on STRAIGHT.	Warning
			PCUR_DIFF_PERIOD	Pcurve period does not agree with curve period.	Warning
	50+	Compatibility check between pcurve location and (non-tolerant) coedge location	DIFF_LOC	True pcurve location from pcurve data != coedge location.	Warning
		Check that TCOEDGE lies within tolerance of corresponding TEDGE	TCOED_STRAY	TCOEDGE strays from TEDGE by more than the tolerance.	Warning
LOOP	10+	Basic pointer checks	LOOP_NO_COED	Loop without coedge.	Error
			COED_NO_PTR_TO_LOOP	Loop's coedge does not point to loop. Fatal topology error.	Error
			NEXT_NOT_TO_START	Loop back through next is not to start.	Error
			OPEN_IN_NEXT	Loop open in next() direction.	Error
			PREV_NOT_TO_START	Loop back through prev is not to start.	Error
			OPEN_IN_PREV	Loop open in previous() direction.	Error
			LOOP_NO_FACE	Loop without face.	Error
		ATTRIB checks (see above)
COEDGE	10+	Basic pointer checks	COED_NO_EDGE	Coedge without edge.	Error
			ISO_VTX_EMBEDDED	Coedge for isolated vertex is embedded in loop.	Error
			COED_NO_OWNER	Coedge without owner.	Error
			COED_EDGE_BAD_PTR	Coedge's edge does not point to coedge. Fatal topology error.	Error
			PARTNER_MISMATCH	Coedge/partner edge mismatch.	Error
			PARTNER_POINT_TO_ITSELF	Coedge/partner points to itself.	Error
			VTX_NOT_SHARED	Sequential coedges do not share vertex.	Error
			TCOED_HAS_EDGE	TCOEDGE has a EDGE.	Error
			COED_HAS_TEDGE	COEDGE has a TEDGE.	Error
			TCOED_NO_PCUR	TCOEDGE has no PCURVE.	Error
		Basic geometry checks	TCOED_DIFF_RANGE	Pcurve range != tcoedge range.	Error
			START_VTX_NOT_ON_SURF	Start vertex not on face surface.	Error
			COED_START_OUTSIDE_TOL_VTX	Coedge start point outside tolerant vertex.	Error
			END_VTX_NOT_ON_SURF	End vertex not on face surface.	Error
			COED_END_OUTSIDE_TOL_VTX	Coedge end point outside tolerant vertex.	Error
			COED_POS_OFF_FACE	Internal position on coedge off face.	Error
			ACIS_ERROR	Outcome checks bad.	Error
	30+	Medium TCOEDGE checks	BAD_TCOED_DOMAIN	Pcurve range not within surface domain on tcoedge.	Warning
			TCOED_PCUR_NOT_G1	TCOEDGE parameter space curve not G1.	Warning
		Non-G1 curve check on TCOEDGE (Note: This check can be invoked at a lower level by switching on the option d3_checks.)	TCOED_NOT_G1	TCOEDGE curve not G1.	Warning
		Check for unmarked discontinuities on TCOEDGE (Note: The option check_discont must be switched on.This check can be invoked at a lower level by switching on the option d3_checks.)	CURVE_MISSING_DISC_INFO	Curve has unmarked G1 or G2 discontinuities.	Error
	40+	Check that COEDGE has a partner on a single-sided face	NO_PARTNER	Coedge without partner on single-sided face.	Warning
		Full TCOEDGE checks (Note: These checks can be invoked at a lower level by switching on the option d3_checks.)	TCOED_IRREG	TCOEDGE curve irregular.	Error
			TCOED_SELF_INT	TCOEDGE curve self-intersects.	Error
			TCOED_WRONG_CLOSURE	TCOEDGE curve closure wrong.	Error
			TCOED_NO_BS3CUR	TCOEDGE no underlying bs3_curve.	Error
			TCOED_BAD_CTL_PNT_COIN	TCOEDGE error in control point coincidence.	Error
			TCOED_BAD_DEGEN	TCOEDGE bad degeneracy in curve.	Error
			TCOED_BAD_SINGULAR	TCOEDGE untreatable singularity in curve.	Error
			TCOED_NOT_G0	TCOEDGE curve not G0.	Error
			TCOED_NOT_G2	TCOEDGE curve not G2.	Warning
			TCOED_NOT_C1	TCOEDGE curve not C1.	Warning
			TCOED_OFF_SURF	TCOEDGE curve not on its surfaces.	Warning
			CURVE_APPROX_OVERCLAMPED	Curve approximation has knots with multiplicity greater than the curve degree.	Error
			CRV_BAD_FITOL	Approximating curve is not within stated tolerance of true curve.	Error/Warning
EDGE	10+	Basic pointer checks	EDGE_NO_BACKPTR	Edge without backptr.	Error
			EDGE_NO_EVTX	Edge without end vertex.	Error
			EDGE_NO_SVTX	Edge without start vertex.	Error
			MULT_EDGE	Vertex has edge in multiple groups.	Error
			EDGE_NO_CRV1	Edge without curve (non-ENTITY).	Error
		Basic geometry checks	SVTX_NOT_ON_CRV	Start vertex not on curve.	Error
			EVTX_NOT_ON_CRV	End vertex not on curve.	Error
			SPAR_ERR	Edge start param err.	Error
			EPAR_ERR	Edge end param err.	Error
			REV_APPROX_CRV	Approximating curve reversed.	Error
			TEDGE_NULL_PAR_RANGE	TEDGE has a NULL parameter range.	Error
		CURVE checks (see below)
		ATTRIB checks (see above)
	20+	TEDGE checks	TEDGE_HAS_LOCAL_SELF_INT	Tolerant edge tube has local self-intersections.	Warning
			ACIS_ERROR	Outcome checks bad.	Error
		Check face order if edge is owned by loop	COED_OUT_OF_ORDER	Coedges out of order about edge.	Error
		Check edge box	EDGE_BOX_TOO_SMALL	Edge box too small, does not contain vertices.	Error
			TEDGE_BOX_NOT_INT_VTX_BOX	Tolerant Edge box does not intersect vertex boxes.	Error
	60+	Convexity points check	CONVEX_POINT	Edge has convexity points.	Error
			CVXTY_ON_EDGE_MARKED_TANGENT	Edge marked as tangent incorrectly.	Error
			CVXTY_PTS_ON_TANGENT_EDGE	Tangent edge has convexity points.	Warning
			CVXTY_PTS_NOT_ON_MIXED_EDGE	Mixed convexity edge has no convexity points.	Warning
			CVXTY_ON_EDGE_MARKED_TANGENT_WARN	Edge possibly marked as tangent incorrectly.	Warning
CURVE	10+	Basic geometry checks	STR_NOT_UNITVEC	Straight direction is not a unit vector.	Error
			STR_ZERO_PAR_SCALE	Straight has zero value parameter scaling.	Error
			ELL_NORM_NOT_UNITVEC	Ellipse normal is not a unit vector.	Error
			ELL_NOT_PERP	Ellipse normal not perpendicular to major_axis.	Error
			ELL_RATIO_GT_1	Ellipse has radius ratio greater than 1.0.	Error
			ELL_ZERO_MAJ_AXIS	Ellipse has zero length major axis.	Error
			ELL_ZERO_RATIO	Ellipse has zero radius ratio.	Error
			INTCRV_INVALID_SUPPORT_SURF	Intcurve has invalid supporting surface.	Error
		Form consistency check on a procedural curve's approximation	SPL_CRV_NO_APPROX	Spline curve has no approximating curve.	Warning
			PROC_CRV_DIFF_APPROX	Procedural curve and its approximation have different forms.	Error
			BS3C_CLOSED_MRKD_OPEN	Closed bs3_curve marked as open.	Error
			BS3C_CLOSED_MRKD_PEROID (Note: This macro was inadvertently misspelled when created. Please use as documented.)	Closed bs3_curve marked as periodic.	Error/Warning
			BS3C_OPEN_NOT_MRKD_OPEN	Open bs3_curve not marked as open.	Error
	20+	Non-G1 curve checks (Note: This check may be invoked at a lower level by switching on the option d3_checks.)	SUPPORT_SURF_NOT_G1	A support surface that is not G1 continuous was found for the edge's underlying intcurve.	Warning
			SUPPORT_SURF_NOT_G1_NEAR_TAN	A support surface that is near tangent, not G1 was found for the edge's underlying curve.	Warning
			CRV_NOT_G1	Curve not G1.	Warning
			CRV_NOT_G1_NEAR_TAN	Curve near tangent, not G1.	Warning
		Unmarked discontinuities check (Note: The option check_discont must be switched on. This check may be invoked at a lower level by switching on the option d3_checks.)	CURVE_MISSING_DISC_INFO	Curve has unmarked G1 or G2 discontinuities.	Error
	30+	General curve checks (Note: These checks may be invoked at a lower level by switching on the option d3_checks.)	CRV_DATA_MISSING	A vital part of the curve data is missing.	Error
			CRV_DATA_CONFLICTING	Curve data is conflicting.	Error
			CRV_NOT_ON_SURF	Curve not on its surfaces.	Warning
			CURVE_EVAL_FAILURE	Curve evaluation failed.	Warning
			CURVE_APPROX_OVERCLAMPED	Curve approximation has knots with multiplicity greater than the curve degree.	Error
			CRV_BAD_FITOL	Approximating curve is not within stated tolerance of true curve.	Error/Warning
			IRREG_CRV	Curve irregular.	Error
			CRV_SELF_INT	Curve self-intersects.	Error
			BAD_CRV_CLS	Curve closure wrong.	Error
			NO_BS3CRV	No underlying bs3_curve.	Error
			BAD_CTL_PNT_COIN	Error in control point coincidence.	Error
			CRV_NOT_G0	Curve not G0.	Error
			CRV_NOT_G2	Curve not G2.	Warning
			CRV_NOT_C1	Curve not C1.	Warning
			IRREG_SUPPORT_SURF	An irregular support surface was found for the edge's underlying intcurve.	Error
			SUPPORT_SURF_SELF_INT	A support self-intersecting support surface was found for the edge's underlying intcurve.	Error
			BAD_SUPPORT_SURF_CLS	A support surface with bad closure was found for the edge's underlying intcurve.	Error
			NO_BS3_SUPPORT_SURF	A support surface with no underlying bs3_surface was found for the edge's underlying intcurve.	Error
			BAD_SUPPORT_SURF_CTL_PNT_COIN	A support surface with bad control point coincidence was found for the edge's underlying intcurve.	Error
			SUPPORT_SURF_BAD_DEGEN	A support surface with bad degeneracy was found for the edge's underlying intcurve.	Error
			SUPPORT_SURF_BAD_SINGULAR	A support surface with an untreatable singularity was found for the edge's underlying intcurve.	Error
			SUPPORT_SURF_NOT_G0	A support surface that is not G0 continuous was found for the edge's underlying intcurve.	Error
			SUPPORT_SURF_NOT_G2	A support surface that is not G2 continuous was found for the edge's underlying intcurve.	Warning
			SUPPORT_SURF_NOT_C1	A support surface that is not C1 continuous was found for the edge's underlying intcurve.	Warning
	70+	Parametrization check	EXTREME_PAR	Intcurve has extreme parametrization.	Warning
			CRV_ZERO_DERIV	Curve has point at which derivative is zero.	Warning
VERTEX	10+	Basic pointer checks	VTX_NO_PNT	Vertex without point.	Error
			VTX_NO_EDGE	Vertex without edge.	Error
			BAD_VTX_EDGE_PTR	Vertex's edge does not point to vertex. Fatal topology error.	Error
			VERTEX_CHAIN_OPEN	Vertex chain open. Fatal topology error.	Error
		Duplicate vertex check	DUP_VTX	Duplicate vertex.	Error
			OVERLAP_TVERT	Overlapping tolerant vertex.	Error
		Overlapping vertex check	OVERLAP_VERT	Overlapping vertex.	Warning
			PART_OVERLAP_TVERT	Partially overlapping tolerant vertex.	Warning
		Check coedge traversal around vertex	VERTEX_COEDGE_CLOSURE_MISMATCH	Vertex/coedge closure mismatch.Fatal topology error.	Error
			COEDGE_CCW_END_MISMATCH	Coedge CCW end vertex mismatch.Fatal topology error.	Error
			NO_CCW_VERTEX_CLOSURE	No CCW coedge closure around vertex.Fatal topology error.	Error
			COEDGE_CCW_NEXT_INCONSISTENT	Coedge CCW next/previous inconsistent.Fatal topology error.	Error
			NO_CW_VERTEX_CLOSURE	No CW coedge closure around vertex.Fatal topology error.	Error
			COEDGE_CW_NEXT_INCONSISTENT	Coedge CW next/previous inconsistent.Fatal topology error.	Error
			COEDGE_CW_START_MISMATCH	Coedge CW start vertex mismatch. Fatal topology error.	Error
		ATTRIB checks (see above)
LAW	10+	Basic form checks	INTERNAL_LAW_IS_BAD	Internal law is NULL.	Note
			LAW_APPROX_ERR	Law derivative approximation error.	Note
Improper intersections	70+	Solid check (Note: These checks may be invoked at a lower level by switching on the option check_ff_int.)	FF_INT_FAIL	Intersection failed.	Warning
		Check for improper face-face intersections	FF_INT_FACE_INT	Improper face intersection.	Error
		Check for coincident face intersections	FF_INT_FACE_COIN	Coincident face intersection.	Error
		Check for improper edge-edge intersections for face edges (Note: The option check_ee_int_always must be switched on.)	FF_INT_EDGE_INT	Improper edge intersection.	Error
		Check for improper shell containments	FF_INT_SHL_INT	Shell intersection.	Warning
			FF_INT_SHL_CONT	Improper shell containment.	Error
		Check for improper lump containments	FF_INT_LMP_INT	Lump intersection.	Warning
			FF_INT_LMP_CONT	Improper lump containment.	Error
		Wire checks
		Check for improper edge-edge intersections for wire edges	FF_INT_EDGE_INT	Improper edge intersection.	Error
Cellular Topology	10+	All cellular topology checks	CT_NOT_POINT_TO_LUMP	Cell does not point to its lump.	Error
			CT_NO_CSHL	Cell has no cshells.	Error
			CT_NOT_VALIDATED	Cell is not validated.	Error
			CT_2D_CELL_NO_CFACE	2D cell has no cfaces.	Error
			CT_NOT_POINT_TO_CELL	Cshell does not point to its cell.	Error
			CT_CSHL_NO_CFACE	Cshell has no cfaces.	Error
			CT_NOT_INSIDE_CSHL	Cshell does not contain other cshells.	Error
			CT_CFACE_NOT_POINT_TO_OWNER	Cface does not point to its owner.	Error
			CT_CFACE_NOT_POINT_TO_FACE	Cface does not point to a face.	Error
			CT_POINT_TO_NO_ATTRIB_FACE	Cface points to face with no attribute.	Error
			CT_ATTRIB_NOT_POINT_TO_FACE	Cface attribute does not point to cface.	Error
			CT_WRONG_SENSE_OR_ATTRIB	Cface sense or attribute pointer is wrong.	Error
			CT_NO_CLOSED_INWARD	Cface has no closest inward on a coedge.	Error
			CT_DIFF_INWARD_OWNER	Cface has closest inward with different owner.	Error
			CT_NO_ATTRIB	Face has no ct attrib.	Error
			CT_SSF_NO_BACK_CFACE	Single sided face does not have back cface.	Error
			CT_DSF_NO_BACK_CFACE	Double sided face does not have back cface.	Error
			CT_NO_OWNER	Cface does not have owner.	Error
			CT_DSF_NO_FRONT_CFACE	Double sided face does not have front cface.	Error
			CT_NOT_IN_HIERACHY	Some cfaces are not in hierarchy.	Error
Sliver faces	30+	Check for sliver faces.	SLIVER_FACE_REMOVED	Sliver face detected and replaced with tedge.	Warning
			SLIVER_FACE_DETECTED	Sliver face detected.	Warning
			NO_SLIVER_FACE_TEST	Test for sliver faces was not performed.	Warning

Table. ID Macros

ID Macro	Message	Status	Description
ACIS_ERROR	outcome checks bad	Error	Face check: Failed to complete face sense check of a non-degenerate torus, which suggests there are geometric problems with this face.
		Error	Coedge check: The coedge check was aborted, possibly due to an exception being thrown during geometric checks.  Auxiliary information available.  Further investigation required.
		Error	Edge check: The edge check was aborted, possibly due to an exception being thrown during geometric checks.  Further investigation required.
ATTRIB_BAD_OWNER	attribute owner is not correct	Error	Any operations where attributes may be handled should be avoided.  Traversal of a corrupt chain could cause a hang.
ATTRIB_CORRUPT_CHAIN	attribute chain is corrupt	Error	Any operations where attributes may be handled should be avoided.  Traversal of a corrupt chain could cause a hang.
BAD_CLOSURE	surface closure wrong	Error	The form of the surface is incorrect. Geometric operations on this surface may fail or produce bad results.
BAD_CRV_CLS	curve closure wrong	Error	The form of the curve is incorrect.  Geometric operations on this curve may fail or produce bad results.
BAD_CTL_PNT_COIN	error in control point coincidence	Error	Surface check: The surface's definition contains coincident control points. All geometric operations on this surface should be avoided.  The surface should be replaced with a valid surface.
		Error	Curve check: The curve's definition contains coincident control points.  All geometric operations on this curve should be avoided.  The curve should be replaced with a valid curve.
BAD_FACE_DOMAIN	U or V range of the face cannot be determined or bad	Error	The face's parametric data is corrupted. All geometric operations on this face should be avoided.
BAD_FACE_LOOP	error in face loop	Error	There is a bad loop in the face. Caution is advised: point-in-face tests will fail or produce bad results.
BAD_ROLLING_BALL_BLEND	Rolling-ball blend surface is illegal	Error	The rolling-ball blend surface is invalid.  Geometric tests on the defining geometry gave inconsistent results. All geometric operations on this surface should be avoided.
BAD_SINGULAR	untreatable singularity in surface	Error	The surface contains a singularity which is not handled by ACIS. The surface is illegal and should be replaced with a valid surface.
BAD_SUBSET_RANGE	Bad Subset range	Error	The surface is subsetted to a range outside of the unsubsetted surface range. All geometric operations on this surface should be avoided.
BAD_SUPPORT_SURF_CLS	A support surface with bad closure was found for the edge's underlying intcurve.	Error	See BAD_CLOSURE.
BAD_SUPPORT_SURF_CTL_PNT_COIN	A support surface with bad control point coincidence was found for the edge's underlying intcurve.	Error	See BAD_CTL_PNT_COIN.
BAD_TCOED_DOMAIN	pcurve range not within surface domain on tcoedge	Warning	The tcoedge's pcurve range does not lie within tolerance of the range of the surface. Auxiliary information available. Evaluations outside the surface range may fail or produce bad results.
BAD_VERTEX_BLEND	Vertex blend surface is illegal	Error	The vertex blend surface is corrupted.  Support surfaces with singularities were encountered. Evaluations on the surface are likely to fail. All geometric operations on this surface should be avoided. Try replacing the blend surface with a larger blend.
BAD_VTX_EDGE_PTR	vertex's edge does not point to vertex. Fatal topology error.	Error	The vertex points to an edge which does not point back to the vertex.
BODY_FAIL_CONT_CHK	body fails containment check	Error	Unable to perform a point-in-body test, which suggests there are geometric problems with this body.
BODY_WARN_CONT_CHK	body fails containment check (maybe a void)	Warning	A point-in-body test did not return the expected "outside" result.  The body may be a void.  Modeling operations, for example, Booleans, may produce quizzical results.
BODY_WITHOUT_LUMP	body without lump	Error	A body's lump pointer should always be non-NULL.
BS3C_CLOSED_MRKD_OPEN	closed bs3_curve marked as open	Error	The bs3_curve is closed but it is marked as open.  Curve evaluations, especially at the ends of the curve, are likely to produce bad results.  The Checker will attempt to repair the problem if api_fix_check_problems is on.
BS3C_CLOSED_MRKD_PEROID (Note: This macro was inadvertently misspelled when created. Please use as documented.)	closed bs3_curve marked as periodic	Error/ Warning	The bs3_curve is closed but marked as periodic.  An error is reported if the curve is an exact intcurve, otherwise a warning is reported.  Occasionally, approximations to a periodic curve are closed but do not meet the periodicity requirement.  Provided the discontinuity at the seam is parametric, rather than geometric, ACIS should be able to handle such data.  Otherwise, curve evaluations, especially at the ends of the curve, are likely to produce bad results.  In the case of an error being reported, the Checker will attempt to repair the problem if the option api_fix_check_problems is on.
BS3C_OPEN_NOT_MRKD_OPEN	open bs3_curve not marked as open	Error	The bs3_curve is open but is marked as closed or periodic.  Curve evaluations, especially at the ends of the curve, are likely to produce bad results.  The Checker will attempt to repair the problem if api_fix_check_problems is on.
BS3S_U_NOT_CLOSED	bs3_surface form in u should be 'closed'	Error	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Surface evaluations, especially at the surface boundaries, are likely to produce bad results.  The checker will attempt to repair this problem if the option api_fix_check_problems is on.
BS3S_U_NOT_OPEN	bs3_surface form in u should be 'open'	Error	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Surface evaluations, especially at the surface boundaries, are likely to produce bad results.  The checker will attempt to repair this problem if the option api_fix_check_problems is on.
BS3S_U_NOT_PERIODIC	bs3_surface form in u should be 'periodic'	Warning	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Occasionally, approximations to a periodic surface are closed but do not meet the periodicity requirement.  Provided the discontinuity at the seam is parametric, rather than geometric, ACIS should be able to handle such data.  Otherwise, surface evaluations, especially at the surface boundaries, are likely to produce bad results.
BS3S_V_NOT_CLOSED	bs3_surface form in v should be 'closed'	Error	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Surface evaluations, especially at the surface boundaries, are likely to produce bad results.  The checker will attempt to repair this problem if the option api_fix_check_problems is on.
BS3S_V_NOT_OPEN	bs3_surface form in v should be 'open'	Error	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Surface evaluations, especially at the surface boundaries, are likely to produce bad results.  The checker will attempt to repair this problem if the option api_fix_check_problems is on.
BS3S_V_NOT_PERIODIC	bs3_surface form in v should be 'periodic'	Error	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Occasionally, approximations to a periodic surface are closed but do not meet the periodicity requirement.  Provided the discontinuity at the seam is parametric, rather than geometric, ACIS should be able to handle such data.  Otherwise, surface evaluations, especially at the surface boundaries, are likely to produce bad results.
COED_EDGE_BAD_PTR	coedge's edge does not point to coedge. Fatal topology error.	Error	The coedge's edge points to a ring of partner coedges that does not include the given coedge.
COED_END_OUTSIDE_TOL_VTX	Coedge end point outside tolerant vertex	Error	The coedge's end_pos and the coedge's end vertex position do not lie within tolerance of each other. Auxiliary information available. Intersection algorithms are likely to fail or produce bad results.
COED_END_VTX_ON_POLE	coedge's end vertex lies on pole of surface	Warning	This warning is not known to cause problems in ACIS.
COED_HAS_TEDGE	COEDGE has a TEDGE	Error	A non-tolerant coedge's edge should also be non-tolerant.
COED_NEXT_NOT_WELL_CONN	coedge's next is not well connected	Error	The coedge and its next coedge do not share a common vertex.
COED_NO_EDGE	coedge without edge	Error	A coedge's edge pointer should always be non-NULL.
COED_NO_OWNER	coedge without owner	Error	A coedge's owner pointer should always point to a wire or loop.
COED_NO_PCUR	coedge on spline surface has no PCURVE	Error	A coedge on a spline surface should always have a pcurve.  Geometric operations involving this coedge are likely to fail.
COED_NO_PTR_TO_LOOP	loop's coedge does not point to loop. Fatal topology error.	Error	The loop has a coedge which does not point back to the loop.
COED_NOT_POINT_TO_WIRE	wire's coedge does not point to wire. Fatal topology error.	Error	The wire has a coedge which does not point back to the wire.
COED_OUT_OF_ORDER	Coedges out of order about edge	Error	Either the coedges are not ordered correctly, or the sidedness of the faces is wrong.
COED_POS_OFF_FACE	internal position on coedge off face	Error	A point on the coedge was found to not lie on the face's surface.  Auxiliary information available.  Intersection algorithms are likely to produce bad results.
COED_PREV_NOT_WELL_CONN	coedge's previous is not well connected	Error	The coedge and its previous coedge do not share a common vertex.
COED_RANGE_NOT_CONT	pcurve's range does notinclude coedge's range	Error	A difference between the pcurve range and coedge range was found.  Geometric operations involving this coedge may produce bad results.
COED_RANGE_NOT_CONT_1	small difference in pcurve's and coedge's range can be neglected	Warning	A small difference (<SPAresabs) between the pcurve range and coedge range was found, but ACIS should be able to handle such data.
COED_START_OUTSIDE_TOL_VTX	Coedge start point outside tolerant vertex	Error	The coedge's start_pos and the coedge's start vertex position do not lie within tolerance of each other.  Auxiliary information available.  Intersection algorithms are likely to fail or produce bad results.
COED_START_VTX_ON_POLE	coedge's start vertex lies on pole of surface	Warning	This warning is not known to cause problems in ACIS.
COEDGE_CCW_END_MISMATCH	coedge CCW end vertex mismatch.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
COEDGE_CCW_NEXT_INCONSISTENT	coedge CCW next/previous inconsistent.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
COEDGE_CW_NEXT_INCONSISTENT	coedge CW next/previous inconsistent.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
COEDGE_CW_START_MISMATCH	coedge CW start vertex mismatch.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
CONE_ANGLE_INCONS	cone's sine and cosine angle inconsistent	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
CONE_ELL_NORM_NOT_UNITVEC	cone's ellipse normal is not a unit vector	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
CONE_ELL_NOT_PERP_TO_AXIS	cone's ellipse normal not perpendicular to major_axis	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
CONE_ELL_RATIO_GT_1	cone's ellipse has radius ratio greater than 1.0	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
CONE_ELL_ZERO_MAJ_AXIS	cone's ellipse has zero length major axis	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
CONE_ELL_ZERO_RATIO	cone's ellipse has zero radius ratio	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
CONVEX_POINT	Edge has convexity points	Error	Convexity points were found on the edge. Auxiliary information available. The edge should be split at its convexity points, or marked as tangent if considered appropriate. The Checker will attempt to split the edge if the option api_fix_check_problems is on.
CRV_BAD_FITOL	Approximating curve is not within stated tolerance of true curve	Error/ Warning	If the claimed fit tolerance is less than SPAresabs, but it needs to be more than SPAresabs, an error is thrown. Otherwise, if the claimed fit tolerance is already larger than SPAresabs, but smaller than it needs to be, a warning is thrown.  Auxiliary information may be available. Very basic geometric tests, such as test_point_tol, could fail.
CRV_DATA_CONFLICTING	Curve data is conflicting	Error	Internal inconsistencies exist in the curve definition. The Checker will attempt to repair them if the option api_fix_check_problems is on.
CRV_DATA_MISSING	A vital part of the curve data is missing	Error	Some defining data (for example, a support surface) is missing from the data. Evaluation of the curve is unlikely to succeed, meaning that most operations involving it will be unsuccessful.
CRV_NOT_C1	curve not C1	Warning	The curve is not C1-continuous.  Mass properties calculations are liable to fail or be inaccurate.
CRV_NOT_G0	curve not G0	Error	The curve is not G0-continuous.  The curve is illegal and should be replaced with a valid curve.
CRV_NOT_G1	curve not G1	Warning	The curve is not tangent-continuous.  Most operations valid for non-G1 geometry should work.  If problems occur, try splitting the owning edge at its discontinuities.
CRV_NOT_G1_NEAR_TAN	curve near tangent, not G1	Warning	Curve is not tangent-continuous, but its largest tangent discontinuity subtends an angle of less than one degree. Most operations valid for non-G1 geometry should work.
CRV_NOT_G2	curve not G2	Warning	The curve is not G2-continuous.  Most operations should succeed.  If problems occur, try splitting the owning edge at its discontinuities.
CRV_NOT_ON_SURF	curve not on its surfaces	Warning	Points on the curve were found to not lie on at least one supporting surface.  Although presented as a warning, this may be a serious error.  Geometric algorithms are likely to fail or produce bad results.
CRV_SELF_INT	curve self-intersects	Error	The curve is self-intersecting.  All geometric operations on this curve should be avoided.
CRV_ZERO_DERIV	Curve has point at which derivative is zero	Warning	Unable to compute the arc length metric due to a zero derivative.
CT_2D_CELL_NO_CFACE	2D cell has no cfaces	Error	A 2D cell's cface pointer should always be non-NULL.
CT_ATTRIB_NOT_POINT_TO_FACE	Cface attribute does not point to cface	Error	An ATTRIB_FACECFACE attribute should always point back to its cface.
CT_CFACE_NOT_POINT_TO_FACE	Cface does not point to a face	Error	A cface's face pointer should always be non-NULL.
CT_CFACE_NOT_POINT_TO_OWNER	Cface does not point to its owner	Error	A cface should always point back to its owner.
CT_CSHL_NO_CFACE	Cshell has no cfaces	Error	A cshell's cface pointer should always be non-NULL.
CT_DIFF_INWARD_OWNER	Cface has closest inward with different owner	Error	An attempt to find the next inward cface along a coedge returned a cface with a different owner.
CT_DSF_NO_BACK_CFACE	Double sided face does not have back cface	Error	A double-sided face has an ATTRIB_FACECFACE attribute whose back cface pointer is NULL.
CT_DSF_NO_FRONT_CFACE	Double sided face does not have front cface	Error	A double-sided face has an ATTRIB_FACECFACE attribute whose front cface pointer is NULL.
CT_NO_ATTRIB	Face has no ct attrib	Error	A lump was found to have an ATTRIB_CELL attribute but the lump has a face with no ATTRIB_FACECFACE attribute.
CT_NO_CLOSED_INWARD	Cface has no closest inward on a coedge	Error	An attempt to find the next inward cface along a coedge returned NULL.  Either the pointers are corrupt or the owning CSHELL is incomplete.
CT_NO_CSHL	Cell has no cshells	Error	A 3D cell's cshell pointer should always be non-NULL.
CT_NO_OWNER	Cface does not have owner	Error	A cface's owner pointer should always be non-NULL.
CT_NOT_IN_HIERACHY	Some cfaces are not in hierarchy	Error	The number of cfaces in a lump was counted in two different ways and they did not match.
CT_NOT_INSIDE_CSHL	Cshell does not contain other cshells	Error	One cshell was found to have a point which was not inside another cshell.  Auxiliary information is available.
CT_NOT_POINT_TO_CELL	Cshell does not point to its cell	Error	A 3D cell's cshell does not point back to the cell.
CT_NOT_POINT_TO_LUMP	Cell does not point to its lump	Error	A 2D or 3D cell should always point back to its owning lump.
CT_NOT_VALIDATED	Cell is not validated	Error	The 3D cell is not validated.  Check the automatic update properties of the owning lump.
CT_POINT_TO_NO_ATTRIB_FACE	Cface points to face with no attribute	Error	A cface's face should always have an ATTRIB_FACECFACE attribute.
CT_SSF_NO_BACK_CFACE	Single sided face does not have back cface	Error	A single-sided face has an ATTRIB_FACECFACE attribute whose back cface pointer is NULL.
CT_WRONG_SENSE_OR_ATTRIB	Cface sense or attribute pointer is wrong	Error	If the cface's ATTRIB_FACECFACE attribute points back to it via the front cface pointer, then its sense should be outside.  If the cface's ATTRIB_FACECFACE attribute points back it via the back cface pointer, then its sense should be inside.
CURVE_APPROX_OVERCLAMPED	Curve approximation has knots with multiplicity greater than the curve degree	Error	Overclamped spline curves are typically non-G0, or have points of zero derivative. Most geometric algorithms will fail to handle such curves
CURVE_EVAL_FAILURE	Curve evaluation failed	Warning	A curve evaluation failed.  Although presented as a warning, this may be a serious error.  Other errors are likely to be reported.
CURVE_MISSING_DISC_INFO	Curve has unmarked G1 or G2 discontinuities	Error	The discontinuities of the curve were computed and did not match the data stored.  The Checker will repair the discontinuity data if the option api_fix_check_problems is on.
CVXTY_ON_EDGE_MARKED_TANGENT	Edge marked as tangent incorrectly.	Error	An edge has been marked as tangent, but convexity points were found that cannot be ignored.  The Checker will reset the marking to unknown if the option api_fix_check_problems is on.  Splitting the edge is recommended.
CVXTY_ON_EDGE_MARKED_TANGENT_WARN	Edge possibly marked as tangent incorrectly.	Warning	An edge has been marked as tangent, but convexity points were found within a loose tolerance.  The Checker will reset the marking to unknown if the option api_fix_check_problems is on.
CVXTY_PTS_NOT_ON_MIXED_EDGE	Mixed convexity edge has no convexity points.	Warning	An edge has been marked as having mixed convexity but no convexity points were found.  Blending, shelling and skinning operations may produce bad results.
CVXTY_PTS_ON_TANGENT_EDGE	Tangent edge has convexity points.	Warning	An edge has been marked as tangent, but convexity points were found.  Blending, shelling and skinning operations may produce bad results.
DIFF_LOC	True pcurve location from pcurve data != coedge location	Warning	There is a point on the pcurve which evaluates (implicitly via the surface) to a point on the edge curve which is more than SPAresfit away.  Auxiliary information available.  Caution is advised.  If problems occur, try regenerating the pcurve.
DUP_VTX	duplicate vertex	Error	Two vertices lie within SPAresabs of each other.  Auxiliary information available.  Modeling operations in the vicinity of this area will fail or produce bad results.
EDGE_BOX_TOO_SMALL	Edge box too small, does not contain vertices	Error	The edge's bounding box is corrupted.  Clash detection, used extensively throughout ACIS, is likely to give incorrect results.  Try resetting the box.
EDGE_NO_BACKPTR	edge without backptr	Error	An edge's owner should always be non-NULL.  This is not necessarily a bad edge, especially if the edge has been intentionally isolated, but it indicates that the entity is not valid as an edge belonging to a larger model.  The edge should be repaired or removed, for example, put the edge in a wire body if it has been intentionally isolated.
EDGE_NO_CRV1	edge without curve (non-ENTITY)	Error	The edge has a non-NULL geometry pointer but the underlying equation is NULL, thus lacking its fundamental definition.
EDGE_NO_EVTX	edge without end vertex	Error	An edge's end pointer should always be non-NULL.
EDGE_NO_SVTX	edge without start vertex	Error	An edge's start pointer should always be non-NULL.
EDGE_OFF_FACE	Edge is not on one of its faces	Error	A point was found on the edge which is more than SPAresabs away from one of its connecting faces.  Intersection algorithms are likely to fail or produce incorrect results.
ELL_NORM_NOT_UNITVEC	ellipse normal is not a unit vector	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
ELL_NOT_PERP	ellipse normal not perpendicular to major_axis	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
ELL_RATIO_GT_1	ellipse has radius ratio greater than 1.0	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
ELL_ZERO_MAJ_AXIS	ellipse has zero length major axis	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
ELL_ZERO_RATIO	ellipse has zero radius ratio	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
END_INCONS_TOL_GEOM	Geometry at end of TCOEDGE and TEDGE appear inconsistent	Error	Unable to point-perp from the end of the tcoedge to the tedge and unable to find a suitable point-perp from the tcoedge to the end of the tedge.  Geometric operations involving the tedge may produce bad results.
END_VTX_NOT_ON_SURF	end vertex not on face surface	Error	The end vertex position does not lie on the face's surface.  Auxiliary information available.  Intersection algorithms are likely to fail or produce bad results.
EPAR_ERR	edge end param err	Error	There is a mismatch between the edge's end_pos and the edge's end vertex.  Intersection algorithms are likely to fail or produce bad results.
EVTX_NOT_ON_CRV	end vertex not on curve	Error	The edge's end vertex was found to not lie on the edge's curve.  Auxiliary information available.  Intersection algorithms are likely to fail or produce bad results.
EXTREME_PAR	intcurve has extreme parametrization	Warning	In general, an intcurve's parametrization is expected not to exceed 1.0.  If its parametrization greatly exceeds 1.0, ACIS algorithms are likely to be unstable.  Auxiliary information available.
FACE_AREA_FAILURE	Face area calculation failed	Error	Failed to calculate the face area, which suggests that the face is too small to work with accurately, or there are problems with the surface.
FACE_BAD_LOOP_ORIENT	face has loop with wrong orientation	Error	There is a bad loop in the face.  Auxiliary information available.  Caution is advised: point-in-face tests will fail or produce bad results.
FACE_BOX_TOO_SMALL	Face box too small, does not contain vertices	Error	The face's bounding box is corrupted.  Clash detection, used extensively throughout ACIS, is likely to give incorrect results.  Try resetting the box.
FACE_NEGA_AREA	face with negative area	Error	The face area was computed to be negative, which suggests that the face is too small to work with accurately, or there are problems with the surface.  Auxiliary information available.
FACE_NO_BACKPTR	face without backptr	Error	The face's owner pointer is NULL.  This is not necessarily a bad face, especially if the face has been intentionally isolated, but it indicates that the entity is not valid as a face belonging to a larger model.  The face should be repaired or removed, for ecample, put the face in a sheet body if it has been intentionally isolated.
FACE_NO_SURF1	face without SURFACE (ENTITY)	Error	A face's geometry pointer should always be non-NULL.  All geometric operations on this face should be avoided.
FACE_NO_SURF2	face without surface (non-ENTITY)	Error	The face's geometry pointer has no underlying equation.  All geometric operations on this face should be avoided.
FACE_NOT_POINT_TO_SHL	shell's face does not point to shell. Fatal topology error.	Error	The shell has a face which does not point back to the shell.  The face should be repaired before use or removed.
FACE_WITHOUT_LOOP	face without loop	Error	With the exception of a complete sphere and a complete torus, a face's loop pointer should always be non-NULL.  The model should be repaired before use.
FACE_ZERO_AREA	face with zero area	Error	The face area was computed to be zero which suggests that the face is too small to work with accurately, or there are problems with the surface.
FF_INT_EDGE_INT	improper edge intersection	Error	Two edges were found to intersect but the topology in the model did not reflect all of the intersections.  This is a self-intersecting body.  Modeling operations, such as Booleans, will either fail or produce bad results.
FF_INT_FACE_COIN	coincident face intersection	Error	Two distinct faces were found to coincide.  This is a self-intersecting body.  Modeling operations, such as Booleans, will either fail or produce bad results.
FF_INT_FACE_INT	improper face intersection	Error	Two faces were found to intersect but the topology in the model did not reflect all of the intersections.  This is a self-intersecting body.  Modeling operations, such as Booleans, will either fail or produce bad results.
FF_INT_FAIL	intersection failed	Warning	An intersection between two faces in the same body failed, so it was not possible to determine whether they intersected improperly.  Most modeling operations will not need to perform this intersection.
FF_INT_LMP_CONT	improper lump containment	Error	Two lumps in the same body have an incorrect containment relationship - neither lump should contain a point from the other.  Incomplete lumps are excluded from this test.
FF_INT_LMP_INT	lump intersection	Warning	If there is a lump intersection, there will be other errors such as improper face-face intersections.
FF_INT_SHL_CONT	improper shell containment	Error	Two shells in the same lump have an incorrect containment relationship - neither shell should contain a point from the other.  Double-sided shells are excluded from this test.
FF_INT_SHL_INT	shell intersection	Warning	If there is a shell intersection, there will be other errors such as improper face-face intersections.
INCONS_DIR	pcurve direction != coedge direction	Error	The pcurve does not look to be a good match with edge curve in three-space - there is a point where the direction of the pcurve and the direction of the edge curve appear to be reversed.  Auxiliary information available.  If problems occur, try regenerating the pcurve.
INTCRV_INVALID_SUPPORT_SURF	Intcurve has invalid supporting surface.	Error	The intcurve has an exact spline supporting surface but the underlying surface data is missing.  This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
INTERNAL_LAW_IS_BAD	internal law is NULL	Note	The law is missing its fundamental definition.  It should be repaired before use or removed.
IRREG_CRV	curve irregular	Error	A curve evaluation failed.  All geometric operations on this curve should be avoided.
IRREG_SUPPORT_SURF	An irregular support surface was found for the edge's underlying intcurve.	Error	See IRREG_SURF.
IRREG_SURF	surface irregular	Error	A surface evaluation failure occurred. Potential auxiliary information and subcategory information available: BAD_APPROXIMATING_SURFACE and HIGH_CURVATURE.  All geometric operations on this surface should be avoided.
ISO_VTX_EMBEDDED	coedge for isolated vertex is embedded in loop	Error	The coedge's geometry is NULL but its next and previous pointers suggest that the coedge belongs to a loop.
LAW_APPROX_ERR	law derivative approximation error	Note	The law's derivative approximation is not sufficiently accurate.  Geometric operations may fail or produce bad results.
LOOP_NO_COED	loop without coedge	Error	A loop's coedge pointer should always be non-NULL.
LOOP_NO_FACE	loop without face	Error	A loop's face pointer should always be non-NULL.
LOOP_ORIENT_CHECK_FAIL	Could not check loop orientation because of problem with loop	Warning	A point-in-loop test failed, which suggests that many geometric algorithms will fail on this model.  Further investigation required.
LUMP_NOT_POINT_TO_BODY	body's lump does not point to body. Fatal topology error.	Error	The body has a lump which does not point back to the body.  The lump should be repaired before use or removed.
LUMP_WITHOUT_BODY	lump without body	Error	A lump's owner pointer should always be non-NULL.  The model should be repaired before use, for example, remove the lump or put the lump into a body.
LUMP_WITHOUT_SHL	lump without shell	Error	A lump's shell pointer should always be non-NULL.  The model should be repaired before use.
MULT_EDGE	vertex has edge in multiple groups	Error	Every edge associated with the vertex should belong to only one manifold group.  Auxiliary information may be available.
NEXT_NOT_TO_START	loop back through next is not to start	Error	Traversal of the coedges did not for a correct loop.
NO_BS3_SUPPORT_SURF	A support surface with no underlying bs3_surface was found for the edge's underlying intcurve.	Error	See NO_BS3SURF.
NO_BS3CRV	no underlying bs3_curve	Error	The curve's approximation is missing or could not be constructed.  It is likely that the curve is badly defined and will not evaluate properly.
NO_BS3SURF	no underlying bs3_surface	Error	The surface's approximation is missing or could not be constructed. It is likely that the surface is badly defined and will not evaluate properly.
NO_CCW_VERTEX_CLOSURE	no CCW coedge closure around vertex.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
NO_CONT_CHK	Containment check could not be performed	Warning	Unable to compute a body box, which suggests the body may be a void or it has geometric problems.
NO_CW_VERTEX_CLOSURE	no CW coedge closure around vertex.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
NO_PARTNER	coedge without partner on single-sided face	Warning	In normal circumstances, a COEDGE on a single-sided face should have a partner.  Exceptions are when the face is in isolation, such as when it has been unhooked.
NO_SLIVER_FACE_TEST	Test for sliver faces was not performed	Warning	Unable to compute a body box, and/or surface approximation.  There may be geometric problems with this face.
NULL_EDGE_AT_APEX	conical face needs NULL edge at apex	Error	A point-in-face calculation suggests that the apex of a cone lies inside the face but there is no topology there.  A degenerate edge should be created at the apex.
OPEN_IN_NEXT	loop open in next() direction	Error	Traversal of the coedges did not form a closed loop.
OPEN_IN_PREV	loop open in previous() direction	Error	Traversal of the coedges did not form a closed loop.
OVERLAP_TVERT	overlapping tolerant vertex	Error	A tolerant vertex lies within the tolerance of another tolerant vertex.  Auxiliary information available.  Modeling operations in the vicinity of this area will fail or produce bad results.
OVERLAP_VERT	overlapping vertex	Warning	Although the vertices are not duplicate, they overlap within tolerance of each other.  Auxiliary information available.  Short edges may be present.  Further modeling operations that refine the model in this area may corrupt the model.
PART_OVERLAP_TVERT	Partially overlapping tolerant vertex	Warning	Although the vertices are not duplicate, they overlap within tolerance of each other.  Auxiliary information available.  Short edges may be present.  Further modeling operations that refine the model in this area may corrupt the model.
PARTNER_MISMATCH	coedge/partner edge mismatch	Error	There is a partner coedge in the ring which does not point to the coedge's edge.
PARTNER_POINT_TO_ITSELF	coedge/partner points to itself	Error	A coedge's partner should not be the same coedge.
PCUR_CLOSED_DIFF_INTCUR	closed pcurve has different form from INTCURVE	Warning	The pcurve is closed but the edge curve is not closed.  Further operations may corrupt the model.  If problems occur, try adjusting the range of the pcurve or regenerating it.
PCUR_CURVE_EVAL_FAILURE	Could not complete pcurve checking due to curve problems	Warning	Unable to evaluate the corresponding curve.  It is likely that other curve problems will be reported.  Replacing the curve is recommended.
PCUR_DIFF_LOC	pcurve location != coedge location	Error	The pcurve does not look to be a good match with edge curve in three-space - there is a point on the curve which evaluates (implicitly via the pcurve) to a point on the surface which is more than SPAresabs away.  Auxiliary information available.  If problems occur, try regenerating the pcurve.
PCUR_DIFF_PERIOD	pcurve period does not agree with curve period	Warning	The pcurve's periodic range does not agree with the edge curve's periodic range. Further operations may corrupt the model. The Checker will attempt to repair this problem if api_fix_check_problems is on.
PCUR_EVAL_PROB	There is a problem with the pcurve eval	Error	Pcurve evaluation failures were encountered during checking of this pcurve. Expect other problem reports for this pcurve.
PCUR_NO_CUR	pcurve has no defining curve	Error	The coedge's pcurve is missing its underlying curve and is undefined.  Geometric operations involving this coedge are likely to fail.
PCUR_NOT_CLOSED	pcurve not closed on closed ELLIPSE curve	Warning	The elliptic edge curve is closed but the pcurve is not closed.  Further operations may corrupt the model.  If problems occur, try regenerating the pcurve.
PCUR_NOT_OPEN	pcurve not open on open ELLIPSE curve	Warning	The elliptic edge curve is open but the pcurve is not open.  Further operations may corrupt the model.  If problems occur, try regenerating the pcurve.
PCUR_NOT_OPEN_ON_STR	pcurve not open on STRAIGHT	Warning	The straight edge curve is open but the pcurve is not open.  Further operations may corrupt the model.  If problems occur, try regenerating the pcurve.
PCUR_NOT_PERIODIC	pcurve not periodic on periodic ELLIPSE curve	Warning	The elliptic edge curve is periodic but the pcurve is not periodic.  Further operations may corrupt the model.  If problems occur, try regenerating the pcurve.
PCUR_OPEN_DIFF_INTCUR	open pcurve has different form from INTCURVE	Warning	The pcurve is open but the edge curve is closed.  Evaluations at the ends of the curve may give bad results.  Further operations may corrupt the model.  If problems occur, try regenerating the pcurve.
PCUR_OUT_OF_RANGE	pcurve is a period outside of face range	Error	The pcurve's range does not lie in the range of the surface.  This error arises in particular when the pcurve's surface is periodic but the face's surface is not periodic,for example, the face's (periodic) surface has been subsetted to the range of the face.  The pcurve must evaluate in the correct range for the face.  Try adjusting the range of the pcurve.
PCUR_PEROID_DIFF_INTCUR (Note: This macro was inadvertently misspelled when created. Please use as documented.)	periodic pcurve has different form from INTCURVE	Warning	The pcurve is periodic but the edge curve is not periodic.  Further operations may corrupt the model.  If problems occur, try adjusting the range of the pcurve or regenerating it.
PCUR_SURF_DIFF	pcurve's surface different from coedge's	Error	The pcurve's geometry is defined on a different surface to that used by the coedge's face. There is probably an invisible hole in the body which will cause most algorithms to fail.
PCUR_UNKNOWN_FORM	pcurve with unknown form	Error	The pcurve's form is undefined.  Further investigation required.
PLN_NORM_NOT_UNITVEC	plane normal is not a unit vector	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
PREV_NOT_TO_START	loop back through prev is not to start	Error	Traversal of the coedges did not form a correct loop.
PROC_CRV_DIFF_APPROX	procedural curve and its approximation have different forms	Error	There is a mismatch between the open/closed/periodic forms of an intcurve and its underlying bs3 approximation.  Curve evaluations, especially at the ends of the curve, are likely to produce bad results.
PROC_SURF_DIFF_APPROX	procedural surface and its approximation have different forms	Error	There is a mismatch between the open/closed/periodic forms of the spline surface and its underlying bs3 approximation.  Surface evaluations, especially at the surface boundaries, are likely to produce bad results.  The checker will attempt to repair this problem if the option api_fix_check_problems is on.
REV_APPROX_CRV	approximating curve reversed	Error	There is a point where the curve direction and the approximating curve direction are reversed.
SHL_DISCONNECTED	Entities in shell are not connected	Error	This breaks the fundamental definition of a shell.  The shell should be repaired before use or removed.
SHL_MISSING_ENTITIES	Connected entities in shell are not listed	Error	Traversal of the shell found more entities than listed in the shell's chain.  Auxiliary information available.  The model should be repaired before use.
SHL_NOT_POINT_TO_LUMP	lump's shell does not point to lump. Fatal topology error.	Error	The lump has a shell which does not point back to the lump.  The shell should be repaired before use or removed.
SHL_WITHOUT_FACE	shell without face or wire	Error	The shell's face and wire pointers should not be both NULL.  The shell should be repaired before use or removed.
SHL_WITHOUT_LUMP	shell without lump	Error	A shell's owner pointer should always be non-NULL.  The model should be repaired before use.
SLIVER_FACE_DETECTED	sliver face detected	Warning	Sliver faces are usually the result of misaligned geometry in earlier modeling operations.  Wherever possible, sliver faces should be replaced with tolerant edges.
SLIVER_FACE_REMOVED	sliver face detected and replaced with tedge	Warning	Fixing options were switched on, and a sliver face was replaced with a tolerant edge.  To control this manually, call api_detect_sliver_faces.
SPAR_ERR	edge start param err	Error	There is a mismatch between the edge's start_pos and the edge's start vertex.  Intersection algorithms are likely to fail or produce bad results.
SPH_ZERO_RAD	sphere has zero radius	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
SPL_CRV_NO_APPROX	spline curve has no approximating curve	Warning	Unable to construct the curve's approximation. It is very likely that other curve problems will be reported in such a case.
SPLSUR_NO_APPROX	spline surface has no approximating surface	Warning	The calculation of the surface's approximation failed. It is very likely that other surface problems will be reported in such a case.
START_INCONS_TOL_GEOM	Geometry at start of TCOEDGE and TEDGE appear inconsistent	Error	Unable to point-perp from the start of the tcoedge to the tedge and unable to find a suitable point-perp from the tcoedge to the start of the tedge.  Geometric operations involving the tedge may produce bad results.
START_VTX_NOT_ON_SURF	start vertex not on face surface	Error	The start vertex position does not lie on the face's surface.  Auxiliary information available.  Intersection algorithms are likely to fail or produce bad results.
STR_NOT_UNITVEC	straight direction is not a unit vector	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
STR_ZERO_PAR_SCALE	straight has zero value parameter scaling	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
SUB_SPL_SUR_FOUND	sub_spl_sur found - algorithms using surface extensions may fail	Warning	A sub_spl_sur is an obsolete surface type.  Avoid surface extensions and other algorithms involving the manipulation of this surface.
SUBSET_RANGE_MODIFIED	Bad Subset range corrected by checker	Warning	A bad subset range was detected but it was corrected because the option api_fix_check_problems was switched on.
SUPPORT_SURF_BAD_DEGEN	A support surface with bad degeneracy was found for the edge's underlying intcurve.	Error	See SURF_BAD_DEGEN.
SUPPORT_SURF_BAD_SINGULAR	A support surface with an untreatable singularity was found for the edge's underlying intcurve.	Error	See BAD_SINGULAR.
SUPPORT_SURF_NOT_C1	A support surface that is not C1 continuous was found for the edge's underlying intcurve.	Warning	See SURF_NOT_C1.
SUPPORT_SURF_NOT_G0	A support surface that is not G0 continuous was found for the edge's underlying intcurve.	Error	See SURF_NOT_G0.
SUPPORT_SURF_NOT_G1	A support surface that is not G1 continuous was found for the edge's underlying intcurve.	Warning	See SURF_NOT_G1.
SUPPORT_SURF_NOT_G1_NEAR_TAN	A support surface that is near tangent, not G1 was found for the edge's underlying curve	Warning	See SURF_NOT_G1_NEAR_TAN.
SUPPORT_SURF_NOT_G2	A support surface that is not G2 continuous was found for the edge's underlying intcurve.	Warning	See SURF_NOT_G2.
SUPPORT_SURF_SELF_INT	A support self-intersecting support surface was found for the edge's underlying intcurve.	Error	See SURF_SEFL_INT.
SURF_BAD_APPROX	Surface approximation is bad	Error	The surface approximation's fit tolerance is considered too large by normal standards.  This should not cause major problems, but if problems are encountered, try generating a tighter approximation or investigate the original surface.
SURF_BAD_DEGEN	bad degeneracy in surface	Error	The surface has adjacent degenerate boundaries. Geometric operations on this surface are likely to fail.
SURF_BAD_FITOL	Approximating surface is not within stated tolerance of true surface	Error/ Warning	If the claimed fit tolerance is less than SPAresabs, but it needs to be more than SPAresabs, an error is thrown.  Otherwise, if the claimed fit tolerance is already larger than SPAresabs, but smaller than it needs to be, a warning is thrown.  Auxiliary information may be available.  Very basic geometric tests, such as test_point_tol, could fail.
SURF_DATA_CONFLICTING	Surface data is conflicting	Error	Internal inconsistencies exist in the surface definition. The Checker will attempt to repair these if api_fix_check_problems is turned on.
SURF_DATA_MISSING	A vital part of the surface data is missing	Error	Some defining data (for example, a support surface) is missing from the data. Evaluation of the surface is likely to fail, meaning that most geometric operations on the surface will fail.
SURF_MISSING_DISC_INFO	Surface has unmarked G1 or G2 discontinuities	Error	The discontinuities of the surface were computed and did not match the data stored.  The Checker will repair the discontinuity data if the option api_fix_check_problems is on.
SURF_NOT_C1	surface not C1	Warning	The surface is not C1-continuous.  Intersection algorithms are liable to be slow.  Mass properties calculations are liable to fail or be inaccurate.
SURF_NOT_G0	surface not G0	Error	The surface is not G0-continuous.  The surface is illegal and should be replaced with a valid surface.
SURF_NOT_G1	surface not G1	Warning	The surface is not G1-continuous.  Caution is advised.  Avoid intersections involving this surface and modeling operations such as blending, offsetting and shelling.  Splitting the owning face at its discontinuities is recommended.
SURF_NOT_G1_NEAR_TAN	surface near tangent, not G1	Warning	The surface is non-G1, but normal discontinuity of the surface is small (usually less than one degree). Most operations valid for non-G1 geometry should work.
SURF_NOT_G2	surface not G2	Warning	The surface is not G2-continuous.  Most operations should succeed but there may be occasional problems, such as coincidence detection.  If problems occur, try splitting the owning face at its discontinuities.
SURF_SEFL_INT (Note: This macro was inadvertently misspelled when created. Please use as documented.)	surface self-intersects	Error	The surface is self-intersecting.  All geometric operations on this surface should be avoided.
SVTX_NOT_ON_CRV	start vertex not on curve	Error	The edge's start vertex was found to not lie on the edge's curve.  Auxiliary information available.  Intersection algorithms are likely to fail or produce bad results.
TCOED_BAD_CTL_PNT_COIN	TCOEDGE error in control point coincidence	Error	See BAD_CTL_PNT_COIN.
TCOED_BAD_DEGEN	TCOEDGE bad degeneracy in curve?	Error	See CRV_BAD_DEGEN.
TCOED_BAD_SINGULAR	TCOEDGE untreatable singularity in curve?	Error	See CRV_BAD_SINGULAR.
TCOED_DIFF_RANGE	Pcurve range != tcoedge range	Error	There is a mismatch between the range of the tolerant coedge and its underlying geometry.  Auxiliary information available.  This tcoedge should be repaired before use.
TCOED_HAS_EDGE	TCOEDGE has a EDGE	Error	A tolerant coedge's edge should also be tolerant.
TCOED_IRREG	TCOEDGE curve irregular	Error	See IRREG_CRV.
TCOED_NO_BS3CUR	TCOEDGE no underlying bs3_curve	Error	See NO_BS3CRV.
TCOED_NO_PCUR	TCOEDGE has no PCURVE	Error	The tolerant coedge has a NULL geometry pointer, thus lacking its fundamental definition.
TCOED_NOT_C1	TCOEDGE curve not C1	Warning	See CRV_NOT_C1.
TCOED_NOT_G0	TCOEDGE curve not G0	Error	See CRV_NOT_G0.
TCOED_NOT_G1	TCOEDGE curve not G1	Warning	See CRV_NOT_G1.
TCOED_NOT_G2	TCOEDGE curve not G2	Warning	See CRV_NOT_G2.
TCOED_OFF_SURF	TCOEDGE curve not on its surfaces	Warning	See CRV_NOT_ON_SURF.
TCOED_PCUR_NOT_G1	TCOEDGE parameter space curve not G1	Warning	The tcoedge's pcurve is not G1 in parameter space.  Auxiliary information available.  It is likely that the tcoedge's 3D curve will have problems.
TCOED_SELF_INT	TCOEDGE curve self-intersects	Error	See CRV_SELF_INT.
TCOED_STRAY	TCOEDGE strays from TEDGE by more than the tolerance	Warning	This warning suggests that the tolerance of the edge may be too small.  Auxiliary information available.  Further operations may corrupt the model.
TCOED_WRONG_CLOSURE	TCOEDGE curve closure wrong	Error	See BAD_CRV_CLS.
TEDGE_BOX_NOT_INT_VTX_BOX	Tolerant Edge box does not intersect vertex boxes	Error	The edge's bounding box is corrupted.  Clash detection, used extensively throughout ACIS, is likely to give incorrect results.  Try resetting the box.
TEDGE_HAS_LOCAL_SELF_INT	tolerant edge tube has local self-intersections	Warning	The tolerant edge's curve intersects itself within its tolerance.  Auxiliary information available.  Geometric algorithms involving this edge, including Boolean operations, may fail or produce bad results.
TEDGE_NULL_PAR_RANGE	TEDGE has a NULL parameter range	Error	A tolerant edge must have a finite parameter range.  This edge must be repaired before use.
TEDGE_OFF_FACE	Tolerant edge is not on one of its faces	Error	A point was found on the tolerant edge, whose distance from a connecting face is more than the edge's tolerance.  Intersection algorithms are likely to fail or produce incorrect results.
TOL_BAD_FACE_BOX	Face box with tolerant topology does not intersect vertex boxes	Error	The face's bounding box is corrupted.  Clash detection, used extensively throughout ACIS, is likely to give incorrect results.  Try resetting the box.
TOL_GEOM_INCOMPATIBLE	TCOEDGE and TEDGE geometry appear to be incompatible	Error	The tcoedge geometry does not look to be a good match with the tedge geometry - there is a point where the direction of the tcoedge and the direction of the tedge appear to be different.  Auxiliary information available.  Geometric operations involving the tedge may produce bad results.
TRANSF_BAD_DETERMINENT (Note: This macro was inadvertently misspelled when created. Please use as documented.)	Transform determinant is not 1.0	Error	Transforms are often applied before performing geometric calculations in ACIS.  Thus, a bad transformation will cause many geometric algorithms to fail or produce bad results.
TRANSF_BAD_REFLECTION	Reflection transform determinant is not -1.0	Error	Transforms are often applied before performing geometric calculations in ACIS.  Thus, a bad transformation will cause many geometric algorithms to fail or produce bad results.
TRANSF_LARGE_TRANSLATION	Transform translation is too large	Error	Transforms are often applied before performing geometric calculations in ACIS.  Thus, a bad transformation will cause many geometric algorithms to fail or produce bad results.
TRANSF_NOT_IDENTITY	Matrix of non-rotation, non-reflection transform is not identity	Error	Transforms are often applied before performing geometric calculations in ACIS.  Thus, a bad transformation will cause many geometric algorithms to fail or produce bad results.
TRANSF_NOT_UNIT_VEC	Transform row or column is not a unit vector	Error	Transforms are often applied before performing geometric calculations in ACIS.  Thus, a bad transformation will cause many geometric algorithms to fail or produce bad results.
TRS_BAD_LOOP	torus loop seems to be badly oriented	Error	A point-in-face calculation suggests that there is a badly oriented loop in a toroidal face.  Geometric algorithms are likely to fail or produce incorrect results.
TRS_BAD_MAJ_RAD	torus major radius less than negative of absolute value of minor radius	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
TRS_NORM_NOT_UNITVEC	torus normal is not a unit vector	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
TRS_ZERO_MAJ_RAD	torus major radius is zero	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
TRS_ZERO_MIN_RAD	torus minor radius is zero	Error	This fundamental flaw in the definition geometry should be repaired before any geometric operation is attempted.
UNBOUND_CONE_FACE	unbounded conical face	Warning	An unbounded conical or cylindrical face was encountered.  Geometric operations, such as point-in-face, may produce bad results.
UNEXPECTED_PROBLEM	Problem not properly handled in the checker detected	Warning	Problems were encountered when exploring the surface.  Geometric operations on this surface may fail.  Caution is advised.
VERTEX_CHAIN_OPEN	vertex chain open.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
VERTEX_COEDGE_CLOSURE_MISMATCH	vertex/coedge closure mismatch.  Fatal topology error.	Error	All operations should be avoided.  Traversal of a corrupt ring of coedges could lead to a hang.
VTX_NO_EDGE	vertex without edge	Error	Wire check: The vertex, found by traversing the coedges, does not point back to an edge.
		Error	Vertex check: A vertex should always point back to an edge.
VTX_NO_PNT	vertex without point	Error	A vertex's geometry pointer should always be non-NULL.
VTX_NOT_SHARED	sequential coedges do not share vertex	Error	Wire check: The ring of wire coedges around a vertex was traversed and not all coedges pointed correctly to the vertex.
		Error	Coedge check: The loop of coedges was traversed and not all coedges pointed to the correct vertex.
WIRE_NOT_POINT_TO_SHL	shell's wire does not point to shell. Fatal topology error.	Error	The shell has a wire which does not point back to the shell.  The wire should be repaired before use or removed.
WIRE_WITHOUT_COED	wire without coedge	Error	A wire's coedge pointer should always be non-NULL.
WIRE_WITHOUT_OWNER	wire without owner	Error	A wire's owner pointer should always be non-NULL.  The wire should be repaired before modeling. For example, remove the wire or put the wire into a shell.
WRONG_FACE_BACKPTR	backptr to wrong face	Error	The face has a loop which does not point back to the face.  The loop should be repaired before use or removed.

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Example Code for api_check_entity

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