Evaluation on an Edge

The following edge evaluation methods are available in 2D and 3D:

Table 3-22: Edge Evaluation Methods in 2D and 3D

method	2d	3d	output type	3.5a name
edgeParamRange(int)	√	√	double[2]	rng
edgeX(int, double[])	√	√	double[][D]	xx
edgeDX(int, double[])	√	√	double[][D]	dxx
edgeDDX(int, double[])	√	√	double[][D]	ddx
edgeNormal(int, double[])	√		double[][D]	nor
edgeCurvature(int, double[])	√	√	double[]	crv
edgeTorsion(int, double[])		√	double[]	crv

The first input argument of all methods is the edge number. The second input argument, when it exists, is an array of parameter values for which to perform evaluation on the edge. For all but the first method, the first index in the output corresponds to the different parameter values, and the second index corresponds to the spatial coordinates.

•	edgeParamRange returns the parameter range for evaluation on the edge.

•	edgeX evaluates the parameters to coordinate values.

•	edgeDX evaluates the parameters to first order derivative values.

•	edgeDDX evaluates the parameters to second order derivative values.

•	edgeNormal evaluates the parameters to normal vector values.

•	edgeCurvature evaluates the parameters to curvature values.

•	edgeTorsion evaluates the parameters to torsion values.