FaceComputeDerivatives Method

public Transform ComputeDerivatives(
	UV point
)

Public Function ComputeDerivatives ( 
	point As UV
) As Transform

public:
Transform^ ComputeDerivatives(
	UV^ point
)

member ComputeDerivatives : 
        point : UV -> Transform 

Parameters

point  UV

The parameters to be evaluated, in natural parameterization of the face.

Return Value

• Origin is the point on the face (equivalent to Evaluate(UV));
• BasisX is the tangent vector along the U coordinate (partial derivative with respect to U).
• BasisY is the tangent vector along the V coordinate (partial derivative with respect to V).
• BasisZ is the underlying surface's normal vector. This is not necessarily aligned with the normal vector pointing out of a solid that contains the face, to get that value use ComputeNormal(UV).

Reference