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Namespace: Autodesk.Revit.DB Class: Edge

Edge.ComputeDerivatives

Method
Description:
Returns the vectors describing the edge at the specified parameter.
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.
Syntax 
public Transform ComputeDerivatives(
	double parameter
)
Parameters
Parameter Type Description
parameter Double The parameter to be evaluated.
Return Value
Type Description
Transform The transformation containing a tangent vector, derivative of tangent vector, and bi-normal vector.