The body to apply the feature to

Array of excluded faces or NULL if not used
The excluded faces are not considered
when applying the feature.

Number of faces in the exclude array

SO direction to use for the isocline
direction. If NULL_TAG is used, then
0,0,1 of the WCS will be created for
the direction vector tag and used.

String value of the angle expression
in degrees. This expression is then
evaluated for the isocline angle.

Optional SO second direction to apply
to the steep faces from the first
direction. This must not be parallel
with the first direction. It applies a second
isocline direction to the resultant steep
faces from the first direction using the
same angle expression. If this option
is used, the angle expression must be
positive.