BSPLINE_MOVE_INTERPOLATION_POINT moves interpolation points in a specified interpolation B-spline.
---->(BSPLINE_MOVE_INTERPOLATION_POINT)---|B-spline|---+ | +----------------------------<---------------------+ | | +---------------------<---------------------+ | | | +--+--|interpolation point|----|new position|--+---->
BSPLINE_MOVE_INTERPOLATION_POINT [specify B-spline] [pick existing interpolation point] [pick new position] [pick existing interpolation point] [pick new position]