MAV_clipPlanes mav_clipPlanesGet(MAV_window *w, float xmin, float xmax, float ymin, float ymax, float zmin, float zmax);
MAV_clipPlanes mav_clipPlanesGetFromPixels(MAV_window *w, int xmin, int xmax, int ymin, int ymax, float zmin, float zmax);
MAV_clipPlanes mav_clipPlanesGetFromBB(MAV_BB bb);
mav_clipPlanesGetFromPixels is the same, but the 3D volume is specified in pixels.
mav_clipPlanesGetFromBB generates a set of clip planes from a BB.