Function GetBCurveParams5( _
   ByVal WantCubicIn As Boolean, _
   ByVal WantNRational As Boolean, _
   ByVal ForceNonPeriodic As Boolean, _
   ByVal IsClosed As Boolean _
) As SplineParamData

Dim instance As ICurve
Dim WantCubicIn As Boolean
Dim WantNRational As Boolean
Dim ForceNonPeriodic As Boolean
Dim IsClosed As Boolean
Dim value As SplineParamData
 
value = instance.GetBCurveParams5(WantCubicIn, WantNRational, ForceNonPeriodic, IsClosed)

SplineParamData GetBCurveParams5( 
   bool WantCubicIn,
   bool WantNRational,
   bool ForceNonPeriodic,
   bool IsClosed
)

SplineParamData^ GetBCurveParams5( 
&   bool WantCubicIn,
&   bool WantNRational,
&   bool ForceNonPeriodic,
&   bool IsClosed
) 

Parameters

WantCubicIn

True to return cubic parameters, false to not

WantNRational

True to return non-rational parameters; false to return rational parameters

ForceNonPeriodic

True to convert the periodic curve to nonperiodic, false to not (see Remarks)

IsClosed

True for closed curves, false otherwise (see Remarks)

Return Value

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

If a Bcurve is closed (IsClosed = true) and periodic (ForceNonPeriodic = false), the seam at the juncture of the beginning and end of the curve is continuous and smooth. The data returned in this form contains a single knot at the juncture.

If a Bcurve is closed (IsClosed = true) and non-periodic (ForceNonPeriodic = true), the seam at the juncture is continuous, contains a cusp, and is not smooth. The data returned in this form contains multiple knots at each end of the Bcurve.

Obsolete versions of this method automatically treated closed Bcurves as periodic. Any cusps at the juncture of closed non-periodic curves, such as teardrops, were lost using these methods. The current method provides more flexibility for specifying precisely which form of the Bcurve to use to prevent unintentional data loss.

This method returns the Bcurve parameterization data in an ISplineParamData object instead of an array. Call the methods and properties on ISplineParamData to obtain the control points, knot points, dimension, order, and periodicity of the Bcurve.