Frame(Basis& f)
Used to downcast a general basis to a frame. Only succeeds if the general basis is holding a frame.
Frame(char* namein, ASpace& ins, GeObList& t)
Builds a frame for the affine space ins, using the objects in the list t, after they are mapped into ins (or its tangent space) if necessary. The frame creates its own copy of the debug name given in the buffer namein. The last object in the list t is the point member of the frame.
Frame(Simplex& b, int n)
Builds a frame from the simplex b. The nth point in the simplex becomes the point member of the frame.