// Filename: rotate_to.h
// Created by:  drose (04Nov99)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////

#ifndef ROTATE_TO_H
#define ROTATE_TO_H

////////////////////////////////////////////////////////////////////
//
// rotate_to()
//
// This function computes a suitable rotation matrix to rotate vector
// a onto vector b.  That is, it computes mat so that a * mat = b.
// The rotation axis is chosen to give the smallest possible rotation
// angle.
//
////////////////////////////////////////////////////////////////////

#include <math.h>
#include "pandabase.h"
#include "luse.h"

BEGIN_PUBLISH

EXPCL_PANDA_MATHUTIL void rotate_to(LMatrix3f &mat, const LVector3f &a, const LVector3f &b);
EXPCL_PANDA_MATHUTIL void rotate_to(LMatrix3d &mat, const LVector3d &a, const LVector3d &b);

EXPCL_PANDA_MATHUTIL void rotate_to(LMatrix4f &mat, const LVector3f &a, const LVector3f &b);
EXPCL_PANDA_MATHUTIL void rotate_to(LMatrix4d &mat, const LVector3d &a, const LVector3d &b);

END_PUBLISH

#endif
