Stopped Blending
A blend face corresponding to a blended edge can be terminated before reaching the end vertices of the blended edge. This is termed a stopped blend.
Stopped blends are created by specifying a setback distance and a stop angle when attaching a blend attribute to the blended edge. Stop angle is the angle between the blended edge direction and the plane used to cap the blend, passing through the end points of the blend cross-section at given setback distance.
Figure. Stop Angle
A special case of stopped blending is when the stop angle is specified as 180 degrees. In such a case, the stop plane is constructed such that it passes through the end vertex and end points of the blend cross-section at the given setback distance.
Figure. Stop Angle at 180 degrees
Setback Difference
When setback difference is specified, the stop plane is constructed as a plane passing through the point on the blended edge at the given setback and the points on spring curves after considering the setback difference value as follows:
right spring curve setback = setback distance + 0.5*setback difference left spring curve setback = setback distance - 0.5*setback difference
Where, left and right sides are determined from the direction of the blended edge.
Note: The stop angle value specified should be 90 degrees in such a case. If the specified stop angle is other than 90 degrees, the setback difference value is ignored.
Figure. Stop Angle at 90 degrees
APIs Used to Create Stop Blends
api_set_const_chamfers
api_set_const_rounds
api_set_var_blends
api_set_abh_blends
Limitations
Entity-entity blends cannot create a stopped blend. The stopping location is based upon the edge being blended, thus entity-entity blends do not have this defined location.
[Top]
© 1989-2007 Spatial Corp., a Dassault Systèmes company. All rights reserved.