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ComputeDerivatives Method

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

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

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]).
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.
See Also