NX/UG二次开发—Parasolid—PK_EDGE_ask_convexity

判断实体边的凸凹性

Convexity	Value	Example
convex	PK_EDGE_convexity_convex_c
concave	PK_EDGE_convexity_concave_c
variable the convexity varies along the edge	PK_EDGE_convexity_variable_c
smooth flat parallel surface normals, both faces have zero face curvature	PK_EDGE_convexity_smooth_flat_c
smooth convex edge convexity is smooth, both faces have positive curvature (or one has zero, one has positive)	PK_EDGE_convexity_smooth_cvx_c
smooth concave edge convexity is smooth, both faces have negative curvature (or one has zero, one has negative)	PK_EDGE_convexity_smooth_ccv_c
smooth inflection edge convexity is smooth, faces have opposite curvature	PK_EDGE_convexity_smooth_inf_c
smooth variable edge convexity is smooth, some parts are smooth convex, some parts are smooth concave	PK_EDGE_convexity_smooth_var_c
knife convex surface normals are anti-parallel and the sum of the curvatures is non-negative	PK_EDGE_convexity_knife_cvx_c
knife concave surface normals are anti-parallel and the sum of the curvatures is non-positive	PK_EDGE_convexity_knife_ccv_c