source: GTP/trunk/App/Demos/Geom/OgreStuff/include/opt/OgreOctree.h @ 1092

Revision 1092, 4.9 KB checked in by gumbau, 18 years ago (diff)

LodStrips? and LODTrees demos

Line 
1/*
2-----------------------------------------------------------------------------
3This source file is part of OGRE
4(Object-oriented Graphics Rendering Engine)
5For the latest info, see http://www.ogre3d.org/
6
7Copyright (c) 2000-2005 The OGRE Team
8Also see acknowledgements in Readme.html
9
10This program is free software; you can redistribute it and/or modify it under
11the terms of the GNU Lesser General Public License as published by the Free Software
12Foundation; either version 2 of the License, or (at your option) any later
13version.
14
15This program is distributed in the hope that it will be useful, but WITHOUT
16ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19You should have received a copy of the GNU Lesser General Public License along with
20this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22http://www.gnu.org/copyleft/lesser.txt.
23-----------------------------------------------------------------------------
24*/
25/***************************************************************************
26octree.h  -  description
27-------------------
28begin                : Mon Sep 30 2002
29copyright            : (C) 2002 by Jon Anderson
30email                : janders@users.sf.net
31
32Enhancements 2003 - 2004 (C) The OGRE Team
33***************************************************************************/
34
35#ifndef OCTREE_H
36#define OCTREE_H
37
38#include <OgreAxisAlignedBox.h>
39#include <OgreWireBoundingBox.h>
40
41#include <list>
42
43namespace Ogre
44{
45
46class OctreeNode;
47
48typedef std::list < OctreeNode * > NodeList;
49
50
51/** Octree datastructure for managing scene nodes.
52@remarks
53This is a loose octree implementation, meaning that each
54octant child of the octree actually overlaps it's siblings by a factor
55of .5.  This guarantees that any thing that is half the size of the parent will
56fit completely into a child, with no splitting necessary.
57*/
58
59class Octree
60{
61public:
62    Octree( Octree * p );
63    ~Octree();
64
65    /** Adds an Octree scene node to this octree level.
66    @remarks
67    This is called by the OctreeSceneManager after
68    it has determined the correct Octree to insert the node into.
69    */
70    void _addNode( OctreeNode * );
71
72    /** Removes an Octree scene node to this octree level.
73    */
74    void _removeNode( OctreeNode * );
75
76    /** Returns the number of scene nodes attached to this octree
77    */
78    int numNodes()
79    {
80        return mNumNodes;
81    };
82
83    /** The bounding box of the octree
84    @remarks
85    This is used for octant index determination and rendering, but not culling
86    */
87    AxisAlignedBox mBox;
88    WireBoundingBox* mWireBoundingBox;
89   
90    /** Creats the wire frame bounding box for this octant
91    */
92    WireBoundingBox* getWireBoundingBox();
93
94    /** Vector containing the dimensions of this octree / 2
95    */
96    Vector3 mHalfSize;
97
98    /** 3D array of children of this octree.
99    @remarks
100    Children are dynamically created as needed when nodes are inserted in the Octree.
101    If, later, the all the nodes are removed from the child, it is still kept arround.
102    */
103    Octree * mChildren[ 2 ][ 2 ][ 2 ];
104
105    /** Determines if this octree is twice as big as the given box.
106    @remarks
107    This method is used by the OctreeSceneManager to determine if the given
108    box will fit into a child of this octree.
109    */
110    bool _isTwiceSize( AxisAlignedBox &box );
111
112    /**  Returns the appropriate indexes for the child of this octree into which the box will fit.
113    @remarks
114    This is used by the OCtreeSceneManager to determine which child to traverse next when
115    finding the appropriate octree to insert the box.  Since it is a loose octree, only the
116    center of the box is checked to determine the octant.
117    */
118    void _getChildIndexes( AxisAlignedBox &, int *x, int *y, int *z );
119
120    /** Creates the AxisAlignedBox used for culling this octree.
121    @remarks
122    Since it's a loose octree, the culling bounds can be different than the actual bounds of the octree.
123    */
124    void _getCullBounds( AxisAlignedBox * );
125
126
127    /** Public list of SceneNodes attached to this particular octree
128    */
129    NodeList mNodes;
130
131protected:
132
133    /** Increments the overall node count of this octree and all it's parents
134    */
135    inline void _ref()
136    {
137        mNumNodes++;
138
139        if ( mParent != 0 ) mParent -> _ref();
140    };
141
142    /** Decrements the overall node count of this octree and all it's parents
143    */
144    inline void _unref()
145    {
146        mNumNodes--;
147
148        if ( mParent != 0 ) mParent -> _unref();
149    };
150
151    ///number of SceneNodes in this octree and all it's children.
152    int mNumNodes;
153
154    ///parent octree
155    Octree * mParent;
156
157};
158
159}
160
161#endif
162
163
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