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csgeom/obb.h

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00001 /*
00002     Copyright (C) 2002 by Jorrit Tyberghein
00003     Copyright (C) 2002 by Daniel Duhprey
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 #ifndef __CS_OBB_H__
00021 #define __CS_OBB_H__
00022 
00029 #include "csgeom/box.h"
00030 #include "csgeom/matrix3.h"
00031 
00032 class csVector3;
00033 class csReversibleTransform;
00034 
00039 class csOBB : public csBox3
00040 {
00041 private:
00042   csMatrix3 mMat;
00043 
00044 public:
00048   csOBB () {}
00049 
00053   csOBB (const csOBB &b) : csBox3 (b), mMat (b.mMat) { }
00054 
00058   csOBB (const csBox3 &b) : csBox3 (b) { }
00059 
00067   csOBB (const csVector3 &dir1, const csVector3 &dir2,
00068         const csVector3 &dir3);
00069 
00070   void AddBoundingVertex (const csVector3 &v);
00071   csVector3 GetCorner (int corner) const; 
00072   const csMatrix3 &GetMatrix () const { return mMat; }
00073 
00077   float Diameter ();
00078 
00082   float Volume ();
00083 
00089   void FindOBB (const csVector3 *vertex_table, int num, float eps = 0.0);
00090 
00096   void FindOBBAccurate (const csVector3 *vertex_table, int num);
00097 };
00098 
00102 class csOBBFrozen
00103 {
00104 private:
00105   csVector3 corners[8];
00106 
00107 public:
00111   void Copy (const csOBB& obb)
00112   {
00113     for (int i = 0 ; i < 8 ; i++)
00114     {
00115       corners[i] = obb.GetCorner (i);
00116     }
00117   }
00118 
00122   void Copy (const csOBB& obb, const csReversibleTransform& trans);
00123 
00127   csOBBFrozen ()
00128   {
00129   }
00130 
00134   csOBBFrozen (const csOBB& obb)
00135   {
00136     Copy (obb);
00137   }
00138 
00145   csOBBFrozen (const csOBB& obb, const csReversibleTransform& trans)
00146   {
00147     Copy (obb, trans);
00148   }
00149 
00153   const csVector3& GetCorner (int corner) const
00154   {
00155     CS_ASSERT (corner >= 0 && corner < 8);
00156     return corners[corner];
00157   }
00158 
00163   bool ProjectOBB (float fov, float sx, float sy, csBox2& sbox,
00164         float& min_z, float& max_z);
00165 };
00166 
00169 #endif // __CS_OBB_H__
00170 

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