func ClipPlane(plane uint32, equation *float64) {
	C.glowClipPlane(gpClipPlane, (C.GLenum)(plane), (*C.GLdouble)(unsafe.Pointer(equation)))
}
func ClipPlane(plane uint32, equation *float64) {
	C.glowClipPlane(gpClipPlane, (C.GLenum)(plane), (*C.GLdouble)(unsafe.Pointer(equation)))
}
// specify a plane against which all geometry is clipped