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OgreOctreeCamera.cpp

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00001 /*
00002 -----------------------------------------------------------------------------
00003 This source file is part of OGRE
00004 (Object-oriented Graphics Rendering Engine)
00005 For the latest info, see http://www.ogre3d.org/
00006 
00007 Copyright © 2000-2004 The OGRE Team
00008 Also see acknowledgements in Readme.html
00009 
00010 This program is free software; you can redistribute it and/or modify it under
00011 the terms of the GNU Lesser General Public License as published by the Free Software
00012 Foundation; either version 2 of the License, or (at your option) any later
00013 version.
00014 
00015 This program is distributed in the hope that it will be useful, but WITHOUT
00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public License along with
00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
00022 http://www.gnu.org/copyleft/lesser.txt.
00023 -----------------------------------------------------------------------------
00024 */
00025 /***************************************************************************
00026 octreecamera.cpp  -  description
00027 -------------------
00028 begin                : Fri Sep 27 2002
00029 copyright            : (C) 2002 by Jon Anderson
00030 email                : janders@users.sf.net
00031 
00032 Enhancements 2003 - 2004 (C) The OGRE Team
00033 
00034 ***************************************************************************/
00035 #include <OgreMath.h>
00036 #include <OgreAxisAlignedBox.h>
00037 #include <OgreRoot.h>
00038 
00039 #include <OgreOctreeCamera.h>
00040 
00041 namespace Ogre
00042 {
00043 OctreeCamera::OctreeCamera( const String& name, SceneManager* sm ) : Camera( name, sm )
00044 {
00045                                                                       
00046 }
00047 
00048 OctreeCamera::~OctreeCamera()
00049 {
00050 }
00051 
00052 OctreeCamera::Visibility OctreeCamera::getVisibility( const AxisAlignedBox &bound )
00053 {
00054 
00055     // Null boxes always invisible
00056     if ( bound.isNull() )
00057         return NONE;
00058 
00059     // Make any pending updates to the calculated frustum
00060     updateView();
00061 
00062     // Get corners of the box
00063     const Vector3* pCorners = bound.getAllCorners();
00064 
00065     // For each plane, see if all points are on the negative side
00066     // If so, object is not visible.
00067     // If one or more are, it's partial.
00068     // If all aren't, full
00069 
00070     int corners[ 8 ] = {0, 4, 3, 5, 2, 6, 1, 7};
00071 
00072     int planes[ 6 ] = {FRUSTUM_PLANE_TOP, FRUSTUM_PLANE_BOTTOM,
00073                        FRUSTUM_PLANE_LEFT, FRUSTUM_PLANE_RIGHT,
00074                        FRUSTUM_PLANE_FAR, FRUSTUM_PLANE_NEAR };
00075 
00076     bool all_inside = true;
00077 
00078     for ( int plane = 0; plane < 6; ++plane )
00079     {
00080 
00081         // Skip far plane if infinite view frustum
00082         if (mFarDist == 0 && planes[ plane ] == FRUSTUM_PLANE_FAR)
00083             continue;
00084 
00085         bool all_outside = true;
00086 
00087         float distance = 0;
00088 
00089         for ( int corner = 0; corner < 8; ++corner )
00090         {
00091             distance = mFrustumPlanes[ planes[ plane ] ].getDistance( pCorners[ corners[ corner ] ] );
00092             all_outside = all_outside && ( distance < 0 );
00093             all_inside = all_inside && ( distance >= 0 );
00094 
00095             if ( !all_outside && !all_inside )
00096                 break;
00097         }
00098 
00099         if ( all_outside )
00100             return NONE;
00101     }
00102 
00103     if ( all_inside )
00104         return FULL;
00105     else
00106         return PARTIAL;
00107 
00108 }
00109 
00110 }
00111 
00112 
00113 
00114 

Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:36 2004