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

Exception	Condition
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.

ComputeDerivatives Method

Syntax

Parameters

Return Value

Exceptions

See Also

Stop fighting Revit automation.