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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
    00030 #include "csextern.h"
    00031
    00032 #include "csgeom/box.h"
    00033 #include "csgeom/matrix3.h"
    00034
    00035 class csVector3;
    00036 class csReversibleTransform;
    00037
    00042 class CS_CRYSTALSPACE_EXPORT csOBB : public csBox3
    00043 {
    00044 private:
    00045   csMatrix3 mMat;
    00046
    00047 public:
    00051   csOBB () {}
    00052
    00056   csOBB (const csOBB &b) : csBox3 (b), mMat (b.mMat) { }
    00057
    00061   csOBB (const csBox3 &b) : csBox3 (b) { }
    00062
    00070   csOBB (const csVector3 &dir1, const csVector3 &dir2,
    00071         const csVector3 &dir3);
    00072
    00073   void AddBoundingVertex (const csVector3 &v);
    00074   csVector3 GetCorner (int corner) const;
    00075   inline const csMatrix3 &GetMatrix () const { return mMat; }
    00076
    00080   float Diameter ();
    00081
    00085   float Volume ();
    00086
    00092   void FindOBB (const csVector3 *vertex_table, int num, float eps = 0.0);
    00093
    00099   void FindOBBAccurate (const csVector3 *vertex_table, int num);
    00100 };
    00101
    00105 class CS_CRYSTALSPACE_EXPORT csOBBFrozen
    00106 {
    00107 private:
    00108   csVector3 corners[8];
    00109
    00110 public:
    00114   inline void Copy (const csOBB& obb)
    00115   {
    00116     for (int i = 0 ; i < 8 ; i++)
    00117     {
    00118       corners[i] = obb.GetCorner (i);
    00119     }
    00120   }
    00121
    00125   void Copy (const csOBB& obb, const csReversibleTransform& trans);
    00126
    00130   csOBBFrozen ()
    00131   {
    00132   }
    00133
    00137   csOBBFrozen (const csOBB& obb)
    00138   {
    00139     Copy (obb);
    00140   }
    00141
    00148   csOBBFrozen (const csOBB& obb, const csReversibleTransform& trans)
    00149   {
    00150     Copy (obb, trans);
    00151   }
    00152
    00156   inline const csVector3& GetCorner (int corner) const
    00157   {
    00158     CS_ASSERT (corner >= 0 && corner < 8);
    00159     return corners[corner];
    00160   }
    00161
    00166   bool ProjectOBB (float fov, float sx, float sy, csBox2& sbox,
    00167         float& min_z, float& max_z);
    00168 };
    00169
    00172 #endif // __CS_OBB_H__
    00173