source: downloads/PlugIns/OctreeSceneManager/src/OgreOctreeCamera.cpp @ 6

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
/***************************************************************************
octreecamera.cpp  -  description
-------------------
begin                : Fri Sep 27 2002
copyright            : (C) 2002 by Jon Anderson
email                : janders@users.sf.net

Enhancements 2003 - 2004 (C) The OGRE Team

***************************************************************************/
#include <OgreMath.h>
#include <OgreAxisAlignedBox.h>
#include <OgreRoot.h>

#include <OgreOctreeCamera.h>

namespace Ogre
{
OctreeCamera::OctreeCamera( const String& name, SceneManager* sm ) : Camera( name, sm )
{
                                                                      
}

OctreeCamera::~OctreeCamera()
{
}

OctreeCamera::Visibility OctreeCamera::getVisibility( const AxisAlignedBox &bound )
{

    // Null boxes always invisible
    if ( bound.isNull() )
        return NONE;

    // Get centre of the box
    Vector3 centre = bound.getCenter();
    // Get the half-size of the box
    Vector3 halfSize = bound.getHalfSize();

    bool all_inside = true;

    for ( int plane = 0; plane < 6; ++plane )
    {

        // Skip far plane if infinite view frustum
        if (plane == FRUSTUM_PLANE_FAR && mFarDist == 0)
            continue;

                // This updates frustum planes and deals with cull frustum
        Plane::Side side = getFrustumPlane(plane).getSide(centre, halfSize);
        if(side == Plane::NEGATIVE_SIDE) return NONE;
        // We can't return now as the box could be later on the negative side of a plane.
        if(side == Plane::BOTH_SIDE) 
                all_inside = false;
    }

    if ( all_inside )
        return FULL;
    else
        return PARTIAL;

}

}