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IGetBCurveParams Method (ICurve)

Obsolete. Superseded by ICurve::IGetBCurveParams3.

.NET Syntax

Visual Basic (Declaration) 
Function IGetBCurveParams() As Double
Visual Basic (Usage) 
Dim instance As ICurve
Dim value As Double
value = instance.IGetBCurveParams()
double IGetBCurveParams()
double IGetBCurveParams(); 

Return Value

Pointer to an array of doubles describing the parameters of the curve (see Remarks)



Call ICurve::IGetBCurveParamsSize2 to determine the size of the array returned and whether the curve data returned by ICurve::IGetBCurveParams is cubic rational or not.

To control the accuracy of the curve data, see IModeler::SetToleranceValue.

The return value is an array of doubles. The array size is ( 2 + numKnots + numControlPointDoubles) where numKnots is (numControlPoints + order). The array is as follows:

[ packedDouble1, packedDouble2, knot1, knot2,..., ControlPoint1[Dimension], ControlPoint2[Dimension],...


  • packedDouble1 is an integer pair containing the Dimension and Order
  • packedDouble2  is an integer pair containing the NumControlPoints and Periodicity
  • knot1
  • knot2


  • ControlPoint1[dimension]
  • ControlPoint2[dimension]


The size of the control point array is based on the curve dimension:

  • If Dimension = 3, then ControlPoint is an array of 3 doubles ( x, y, z )
  • If Dimension = 4, then ControlPoint is an array of 4 doubles ( x, y, z, w ) where
    w = weight

See Also

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