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: 21.0.0.0 (21.1.1.109)
Since:  2021

Syntax

C#
public IList<UV> ComputeDerivatives(
	double parameter,
	bool normalized
)
Visual Basic
Public Function ComputeDerivatives ( _
	parameter As Double, _
	normalized As Boolean _
) As IList(Of UV)
Visual C++
public:
IList<UV^>^ ComputeDerivatives(
	double parameter, 
	bool normalized
)

Parameters

parameter
Type: System..::..Double
The specified parameter along the curve.
normalized
Type: System..::..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

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

ExceptionCondition
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.

See Also