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ObjRefSurfaceParameter Method
If the reference geometry is a surface, brep with one face, or surface edge with a selection point, then this gets the surface paramters of the selection point.

Namespace: Rhino.DocObjects
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public Surface SurfaceParameter(
	out double u,
	out double v
)

Parameters

u
Type: SystemDouble
The U value is assigned to this out parameter during the call.
v
Type: SystemDouble
The V value is assigned to this out parameter during the call.

Return Value

Type: Surface
If the selection point was on a surface, then the surface is returned.
See Also