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GetPCurveParams Method (ICurve)

Obsolete. Superseded by ICurve::GetPCurveParams2.

.NET Syntax

Visual Basic (Declaration) 
Function GetPCurveParams() As System.Object
Visual Basic (Usage) 
Dim instance As ICurve
Dim value As System.Object
value = instance.GetPCurveParams()
System.object GetPCurveParams()
System.Object^ GetPCurveParams(); 

Return Value

Array of doubles describing the parameters of the curve (see Remarks)



This method returns the curve as a series of segments, each of which has this form:

(w0*a0 + w1*a1*t + w2*a2*t**2 + w3*a3*t**3) 

p(t) = --------------------------------------------

(w0 + w1*t + w2*t**2 + w3*t**3) 

Where w is the weight coefficient and a is the polynomial coefficient.

The coefficients returned are vectors of dimensions "dim". For example, if the curve is rational, then dimension = 4, and the coefficients returned for each segment are as follows:


However, if the curve is returned as non-rational, then dimension = 3, and its coefficients are:


The size of the return value array is (3 + NumberKnots + NumberSegments x Order x Dimension).

The array is as follows:

[ packedDouble1, packedDouble2, packedDouble3, knot1, knot2,..., CoefficientsSegment1[Dimension], CoefficientsSegment2[Dimension],... ]


packedDouble1: Integer pair containing Reserved and Order

packedDouble2: Integer pair containing NumberSegments and Periodicity

packedDouble3: Integer pair containing NumberKnots and Dimension







The coefficients for each segment start with the constant term and end with the term of highest degree (for example, ConstantX, ConstantY, ConstantZ, AX, AY, AZ, BX, BY, BZ). The total number of coefficients is:

(NumberSegments) x (Order) x (Dimension).


See Also

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