The only constraint is that the values for a particular control point must occupy contiguous memory locations. Must be positive. This allows control points to be embedded in arbitrary data structures. The only constraint is that the values for a particular control point must occupy contiguous memory locations. Must be positive.
Points Specifies a pointer to the array of control points.
Changes to the contents of Points have no effect after glMap2 is called. The glMap2 subroutine is called between a call to glBegin and the corresponding call to glEnd . Associated Gets Associated gets for the glMap2 subroutine are as follows. OpenGL Overview .