[61] | 1 | /*
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| 2 | -----------------------------------------------------------------------------
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| 3 | This source file is part of OGRE
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| 4 | (Object-oriented Graphics Rendering Engine)
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| 5 | For the latest info, see http://www.ogre3d.org/
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| 6 |
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| 7 | Copyright (c) 2000-2005 The OGRE Team
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| 8 | Also see acknowledgements in Readme.html
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify it under
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software
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| 12 | Foundation; either version 2 of the License, or (at your option) any later
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| 13 | version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT
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| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License along with
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| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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| 22 | http://www.gnu.org/copyleft/lesser.txt.
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| 23 | -----------------------------------------------------------------------------
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| 24 | */
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| 25 | /***************************************************************************
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| 26 | octreecamera.cpp - description
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| 27 | -------------------
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| 28 | begin : Fri Sep 27 2002
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| 29 | copyright : (C) 2002 by Jon Anderson
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| 30 | email : janders@users.sf.net
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| 31 |
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| 32 | Enhancements 2003 - 2004 (C) The OGRE Team
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| 33 |
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| 34 | ***************************************************************************/
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| 35 | #include <OgreMath.h>
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| 36 | #include <OgreAxisAlignedBox.h>
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| 37 | #include <OgreRoot.h>
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| 38 |
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| 39 | #include <OgreOctreeCamera.h>
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| 40 |
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| 41 | namespace Ogre
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| 42 | {
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| 43 | OctreeCamera::OctreeCamera( const String& name, SceneManager* sm ) : Camera( name, sm )
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| 44 | {
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| 45 |
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| 46 | }
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| 47 |
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| 48 | OctreeCamera::~OctreeCamera()
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| 49 | {
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| 50 | }
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| 51 |
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| 52 | OctreeCamera::Visibility OctreeCamera::getVisibility( const AxisAlignedBox &bound )
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| 53 | {
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| 54 |
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| 55 | // Null boxes always invisible
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| 56 | if ( bound.isNull() )
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| 57 | return NONE;
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| 58 |
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| 59 | // Make any pending updates to the calculated frustum
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| 60 | updateView();
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| 61 |
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| 62 | // Get corners of the box
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| 63 | const Vector3* pCorners = bound.getAllCorners();
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| 64 |
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| 65 | // For each plane, see if all points are on the negative side
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| 66 | // If so, object is not visible.
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| 67 | // If one or more are, it's partial.
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| 68 | // If all aren't, full
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| 69 |
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| 70 | int corners[ 8 ] = {0, 4, 3, 5, 2, 6, 1, 7};
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| 71 |
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| 72 | int planes[ 6 ] = {FRUSTUM_PLANE_TOP, FRUSTUM_PLANE_BOTTOM,
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| 73 | FRUSTUM_PLANE_LEFT, FRUSTUM_PLANE_RIGHT,
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| 74 | FRUSTUM_PLANE_FAR, FRUSTUM_PLANE_NEAR };
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| 75 |
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| 76 | bool all_inside = true;
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| 77 |
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| 78 | for ( int plane = 0; plane < 6; ++plane )
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| 79 | {
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| 80 |
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| 81 | // Skip far plane if infinite view frustum
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| 82 | if (mFarDist == 0 && planes[ plane ] == FRUSTUM_PLANE_FAR)
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| 83 | continue;
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| 84 |
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| 85 | bool all_outside = true;
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| 86 |
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| 87 | float distance = 0;
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| 88 |
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| 89 | for ( int corner = 0; corner < 8; ++corner )
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| 90 | {
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| 91 | distance = mFrustumPlanes[ planes[ plane ] ].getDistance( pCorners[ corners[ corner ] ] );
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| 92 | all_outside = all_outside && ( distance < 0 );
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| 93 | all_inside = all_inside && ( distance >= 0 );
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| 94 |
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| 95 | if ( !all_outside && !all_inside )
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| 96 | break;
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| 97 | }
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| 98 |
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| 99 | if ( all_outside )
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| 100 | return NONE;
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| 101 | }
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| 102 |
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| 103 | if ( all_inside )
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| 104 | return FULL;
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| 105 | else
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| 106 | return PARTIAL;
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| 107 |
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| 108 | }
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| 109 |
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| 110 | }
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| 111 |
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| 112 |
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| 113 |
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| 114 |
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