SubDEvaluate Method (SubDComponentParameter, Point3d, Vector3d, Vector3d, Vector3d)

Evaluates the location, first derivatives and unit normal of a point on this SubD's surface.

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll)

Since: 9.0

Syntax

public bool Evaluate(
	SubDComponentParameter parameter,
	out Point3d point,
	out Vector3d ds,
	out Vector3d dt,
	out Vector3d normal
)

Public Function Evaluate ( 
	parameter As SubDComponentParameter,
	<OutAttribute> ByRef point As Point3d,
	<OutAttribute> ByRef ds As Vector3d,
	<OutAttribute> ByRef dt As Vector3d,
	<OutAttribute> ByRef normal As Vector3d
) As Boolean

Parameters

parameter: Type: Rhino.GeometrySubDComponentParameter
The parameter to evaluate.
point: Type: Rhino.GeometryPoint3d
The surface point is returned here, or Unset if this fails.
ds: Type: Rhino.GeometryVector3d
The first derivative in the direction of the first face corner parameter is returned here.
dt: Type: Rhino.GeometryVector3d
The first derivative in the direction of the second face corner parameter is returned here.
normal: Type: Rhino.GeometryVector3d
The unit surface normal is returned here. It is parallel to the cross product of ds and dt.

Return Value

Type: Boolean
True if the evaluation succeeded.

Reference

SubD Class

Evaluate Overload

Rhino.Geometry Namespace