NurbsSurface.EvaluatePosition operator


Returns the Position and optionally U tangent, V Tangent,Normal at a given UV value.

Note: This method uses output arguments. C# and some scripting languages (such as JScript and PerlScript) don't support arguments passed by reference. However, there is a alternate version of this method which is considered safe to use with C#, JScript and PerlScript: NurbsSurface.EvaluatePosition2.

C# Syntax

NurbsSurface.EvaluatePosition( Double in_dUValue, Double in_dVValue, Object& out_pPosition, Object& out_pUTangent, Object& out_pVTangent, Object& out_pNormal );

Scripting Syntax

NurbsSurface.EvaluatePosition( UValue, VValue, [Position], [UTangent], [VTangent], [Normal] );


Parameter Type Description
UValue Double The UValue at which we want to evaluate the surface.
VValue Double The VValue at which we want to evaluate the surface.
Position SIVector3 (contains the position) Position at the given UV.
UTangent SIVector3 (contains the U tangent) Tangent in U at the given UV.
VTangent SIVector3 (contains the V tangent) Tangent in V at the given UV.
Normal SIVector3 (contains the normal) Normal at the given UV.


VBScript Example

set oRoot = Application.ActiveProject.ActiveScene.Root
set oSphere = oRoot.AddGeometry( "Sphere", "NurbsSurface" )
oSphere.ActivePrimitive.Geometry.Surfaces(0).EvaluatePosition _
        3.0, 4.0, oPosition,oUTangent,oUTangent,oNormal
LogMessage "The position at 3.0, 4.0 is x :" &  oPosition.x & _
        " y: " & oPosition.y & " z: " & oPosition.z