M

CurveUV.ComputeDerivatives

Description:
Computes the first derivative, the second derivative and the unit tangent vector at the specified parameter along the curve.

public IList<UV> ComputeDerivatives(
	double parameter,
	bool normalized
)

Public Function ComputeDerivatives ( _
	parameter As Double, _
	normalized As Boolean _
) As IList(Of UV)

public:
IList<UV^>^ ComputeDerivatives(
	double parameter, 
	bool normalized
)

Double

parameter

The specified parameter along the curve.
Boolean

normalized

If false, parameter is interpreted as natural parameterization of the curve. If true, param is expected to be in [0,1] interval mapped to the bounds of the curve. Setting to true is valid only if the curve is bound.

Return Value IList<UV> The array containing three members: the first derivative (at index [0]), the second derivative (at index [1]) and the unit tangent vector (at index [2]).

Autodesk.Revit.Exceptions.ArgumentException

The given value for parameter is not finite
Autodesk.Revit.Exceptions.ArgumentOutOfRangeException

The curve cannot be evaluated as normalized because it is unbound. -or- The parameter is not a valid value for normalized evaluation.