Function IGetControlPoints( _
   ByVal Row As System.Integer, _
   ByVal Column As System.Integer, _
   ByVal Count As System.Integer _
) As System.Double

Dim instance As IBSurfParamData
Dim Row As System.Integer
Dim Column As System.Integer
Dim Count As System.Integer
Dim value As System.Double
 
value = instance.IGetControlPoints(Row, Column, Count)

System.double IGetControlPoints( 
   System.int Row,
   System.int Column,
   System.int Count
)

System.double IGetControlPoints( 
&   System.int Row,
&   System.int Column,
&   System.int Count
) 

Parameters

Row

1 <= index of row <= ControlPointRowCount

Column

1 <= index of column <= ControlPointColumnCount

Count

ControlPointDimension

Return Value

• in-process, unmanaged C++: Pointer to an array of doubles 

Control points are stored in (ControlPointColumnCount*ControlPointRowCount) vectors of dimension ControlPointDimension. The U direction of surface is in the row direction. The V direction of surface is in the column direction.

• For non-rational surfaces ControlPointDimension = 3, and control point coordinates are stored as [x0,y0,z0,x1,y1,z1,.........].

• For rational surfaces ControlPointDimension = 4, and control point coordinates and weights are stored as [x0,y0,z0,w0,x1,y1,z1,w1,........].

• For example, 6 control points are stored in 6 vectors of dimension 3 in a 2X3 matrix as follows: