v := attach.weight.face(a)
attach.weight.face(a) := v

Get a vector with all components in the range 0 to 1.0. For type 3 attachments (face), returns the location of the gridpoints in the face with respect to the face vertices. The fourth quad weight can be computed by subtracting all three weights on the vector from 1.0. If the attachment type is a type other than 3, the function returns a vector with all values set to 0.0.

Returns:v - vector
Accepts:v - vector
Arguments:a - attach pointer