func ClipPlane(plane uint32, equation *float64) {
	syscall.Syscall(gpClipPlane, 2, uintptr(plane), uintptr(unsafe.Pointer(equation)), 0)
}
func ClipPlane(plane uint32, equation *float64) {
	syscall.Syscall(gpClipPlane, 2, uintptr(plane), uintptr(unsafe.Pointer(equation)), 0)
}
func ClipPlane ( plane uint32 , equation * float64 ) { syscall . Syscall ( gpClipPlane , 2 , uintptr ( plane ) , uintptr ( unsafe . Pointer ( equation ) ) , 0 ) }
// specify a plane against which all geometry is clipped
specify a plane against which all geometry is clipped