Edge.ComputeDerivatives Method

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0)

Syntax

C#

public Transform ComputeDerivatives(
	double parameter
)

Parameters

parameter  Double

The parameter to be evaluated.

Return Value

Transform
The transformation containing a tangent vector, derivative of tangent vector, and bi-normal vector.

Remarks

The following is the meaning of the transformation members:

• Origin is the point on the edge (equivalent to Evaluate);
• BasisX is the tangent vector (the first derivative);
• BasisY is the second derivative;
• BasisZ is the bi-normal vector (tangent x normal).

Normal and bi-normal are zero if the edge is straight at the point. None of the vectors are normalized.

See Also

Reference