Intersections

56.1 Introduction

The following intersection functionality is available:

Function	Finds intersections between	Notes
PK_CURVE_intersect_curve	specified regions of two curves	Coincident intersections are returned for all points lying at the bounds of regions of coincidence, including the ends of fully coincident curves (or regions of curves). By using sp-curves, this function can be used indirectly to perform curve/curve intersection in the parametric space of a surface.
PK_SURF_intersect_curve	a surface and a curve	Coincident intersections are returned for all points lying at the bounds of regions of coincidence, including the ends of the bounded curve, which are coincident with the surface.
PK_FACE_intersect_curve	a face and the specified region of a curve	The intersections are ordered along the bounded curve, and are classified according to the direction of the curve.
PK_FACE_intersect_face	two faces	If the faces are from the same body any curves returned are created as construction geometry in the body. If the faces are from different bodies and any of the curves returned are of type intersection curve, then these curves refer to copies of the surfaces of faces. Note: No attempt is made to define surface regions of partial coincidence, and if the surfaces of faces are fully coincident no intersection data is returned.
PK_SURF_intersect_surf	two surfaces	The two surfaces must both be orphans or from the same body. In the second case any resulting curves are created as construction geometry on the body. Note: No attempt is made to define surface regions of partial coincidence, and if the surfaces of faces are fully coincident no intersection data are returned.
PK_FACE_intersect_surf	a face and a surface	The surface must be an orphan or owned by the same body as the face. If the surface is not an orphan then any curves are created as construction geometry. If the surface is an orphan and any of the curves returned are intersection curves, then these curves refer to the surface and a copy of the surface of the face. Note: No attempt is made to define surface regions of partial coincidence, and if the surfaces of faces are fully coincident no intersection data are returned.

Note: These functions partially support facet geometry. See the PK Interface Programming Reference Manual for more information.

All functions, except PK_FACE_intersect_curve, take an options structure which for performance purposes allows you to specify areas of interest in the body by stipulating:

`box`

A 3-space box of interest

all intersections inside the specified box are returned, but ones outside of it may not be
applies to all functions except PK_FACE_intersect_curve

`uvbox_1` and `uvbox_2`

Parameter boxes for the two entities

the intersection curves returned are not trimmed to lie within the boundaries of the parameter box(es)
applies to PK_FACE_intersect_face and PK_FACE_intersect_surf

`common_surf`

The surface which contains both of the curves

applies to PK_CURVE_intersect_curve

Contents

56.1 Introduction

box

uvbox_1 and uvbox_2

common_surf

`box`

`uvbox_1` and `uvbox_2`

`common_surf`