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SurfaceCurvatureCreateFromSubD Method (SubD, SubDComponentParameter, SubDExtraordinaryVertexCurvature)

Create a SurfaceCurvature by evaluating a SubD's surface (its limit surface) at a surface parameter, choosing what to report exactly on an extraordinary vertex.

Namespace:  Rhino.Geometry
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 9.0
Syntax
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public static SurfaceCurvature CreateFromSubD(
	SubD subd,
	SubDComponentParameter parameter,
	SubDExtraordinaryVertexCurvature extraordinaryVertexCurvature
)

Parameters

subd
Type: Rhino.GeometrySubD
The SubD to evaluate.
parameter
Type: Rhino.GeometrySubDComponentParameter
The surface parameter to evaluate.
extraordinaryVertexCurvature
Type: Rhino.GeometrySubDExtraordinaryVertexCurvature
What to report when the parameter is exactly on an extraordinary vertex, where the limit surface has no curvature of its own. This changes nothing anywhere else, including inside such a vertex's corner quad.

Return Value

Type: SurfaceCurvature
A SurfaceCurvature if successful, null otherwise.
Remarks
With SectorAverage the result at an extraordinary vertex is an average of the curvature around it, so Direction(Int32) is unset: an average has no single principal direction. Point and Normal are the vertex's own and are exact.
See Also