The 3D ACIS® Modeler (ACIS) is Spatial’s prominent 3D solid modeling engine. 3D InterOp is a CAD data translation framework (Interoperability)

From DocR19

Use the member functions surface::singular_u, surface::singular_v to determine a singularity.

Signature

logical surface::singular_u(double) const;
logical surface::singular_v(double) const;

Header Files

#include "surface.hxx"

Scheme Commands

No Scheme command.

Notes

These functions return marked singularities at places where multiple values of a SPAparameter generate the same object-space point. This function does not distinguish between geometric and parametric singularities and will not return all known forms of parametric singularities.

These singularities can only occur at the ends of the surface parameter ranges.