RFNurbsSurface.GetHControlPoints

Description

Retrieves the number of control points of the NURBS surface and collects homogeneous control point coordinates in an RFHPoint array.

Syntax

Function RFNurbsSurface.GetHControlPoints(pCtrlPoint As RFHPoint, pPtsCount As Long) As RFErrorCode

The GetHControlPoints syntax has these parts:

Part	Description
pCtrlPoint	[OUT] RFHPoint Required. The first element of RFHPoint array to store control points.
pPtsCount	[OUT] Long Required. The number of control points of the NURBS surface.

Remarks

Control points are stored as follows,

pCtrlPoint (0) = Control Points (0,0)
pCtrlPoint (1) = Control Points (0,1)

pCtrlPoint (Vn - 1 ) = Control Points (0, Vn - 1)
pCtrlPoint (Vn) = Control Points (1,0)

pCtlPoint (Un X Vn -1) = Control Points (Un - 1, Vn - 1 )

where, Un = the number of control points in U parametric direction.
Vn = the number of control points in V parametric direction.
Control Points (i,j) = i'th in U parametric direction and j!/th in V parametric direction control point of NURBS surface.
The memory storage space of pCtrlPoint array needs to be allocated prior to calling this method. The required array size can be obtained by RFNurbsSurface.GetControlpointCount method which returns the number of control points of the NURBS surface.