CurveUVComputeDerivatives Method

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

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)

Syntax

C++

Copy

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
)

member ComputeDerivatives : 
        parameter : float * 
        normalized : bool -> IList<UV>

Parameters

parameter Double: The specified parameter along the curve.
normalized Boolean: 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

IListUV
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]).

Exceptions

Exception	Condition
ArgumentException	The given value for parameter is not finite
ArgumentOutOfRangeException	The curve cannot be evaluated as normalized because it is unbound. -or- The parameter is not a valid value for normalized evaluation.

Reference

CurveUV Class

Autodesk.Revit.DB Namespace