Evaluation on a Face

Use the following method for face evaluation in 3D. They do not work on virtual geometry objects.

Table 3-23: Face Evaluation Methods in 3D

method	output type	3.5a name
faceParamRange(int)	double[4]	rng, flgeomfs
faceX(int, double[][2])	double[][3]	xx
faceDX(int, double[][2])	double[][3][2]	dx
faceDDX(int, double[][2])	double[][3][2][2]	ddx
faceNormal(int, double[][2])	double[][3]	nor
faceFF1(int, double[][2])	double[][2]	ff1
faceFF2(int, double[][2])	double[][2]	ff2
faceGaussCurvature(int, double[][2])	double[]	crv
faceMeanCurvature(int, double[][2])	double[]	crv

The first input argument of all methods is the face number. The second input argument, when it exists, is a matrix of parameter points, for which to perform evaluation. For all but the first method, the first index in the output corresponds to the different parameter points.

•	faceParamRange returns two parameter ranges for evaluation on the face.

•	faceX evaluates the parameters to coordinate values.

•	faceDX evaluates the parameters to first order derivative values.

•	faceDDX evaluates the parameters to second order derivative values.

•	faceNormal evaluates the parameters to normal vector values.

•	faceFF1 evaluates the parameters to the first fundamental form values.

•	faceFF2 evaluates the parameters to the second fundamental form values.

•	faceGaussCurvature evaluates the parameters to Gauss curvature values.

•	faceMeanCurvature evaluates the parameters to mean curvature values.