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OgrePlane.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 © 2000-2002 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 #include "OgreStableHeaders.h"
00026 #include "OgrePlane.h"
00027 
00028 namespace Ogre {
00029     //-----------------------------------------------------------------------
00030     Plane::Plane ()
00031     {
00032         normal = Vector3::ZERO;
00033         d = 0.0;
00034     }
00035     //-----------------------------------------------------------------------
00036     Plane::Plane (const Plane& rhs)
00037     {
00038         normal = rhs.normal;
00039         d = rhs.d;
00040     }
00041     //-----------------------------------------------------------------------
00042     Plane::Plane (const Vector3& rkNormal, Real fConstant)
00043     {
00044         normal = rkNormal;
00045         d = -fConstant;
00046     }
00047     //-----------------------------------------------------------------------
00048     Plane::Plane (const Vector3& rkNormal, const Vector3& rkPoint)
00049     {
00050         normal = rkNormal;
00051         d = -rkNormal.dotProduct(rkPoint);
00052     }
00053     //-----------------------------------------------------------------------
00054     Plane::Plane (const Vector3& rkPoint0, const Vector3& rkPoint1,
00055         const Vector3& rkPoint2)
00056     {
00057         redefine(rkPoint0, rkPoint1, rkPoint2);
00058     }
00059     //-----------------------------------------------------------------------
00060     Real Plane::getDistance (const Vector3& rkPoint) const
00061     {
00062         return normal.dotProduct(rkPoint) + d;
00063     }
00064     //-----------------------------------------------------------------------
00065     Plane::Side Plane::getSide (const Vector3& rkPoint) const
00066     {
00067         Real fDistance = getDistance(rkPoint);
00068 
00069         if ( fDistance < 0.0 )
00070             return Plane::NEGATIVE_SIDE;
00071 
00072         if ( fDistance > 0.0 )
00073             return Plane::POSITIVE_SIDE;
00074 
00075         return Plane::NO_SIDE;
00076     }
00077     //-----------------------------------------------------------------------
00078     void Plane::redefine(const Vector3& rkPoint0, const Vector3& rkPoint1,
00079         const Vector3& rkPoint2)
00080     {
00081         Vector3 kEdge1 = rkPoint1 - rkPoint0;
00082         Vector3 kEdge2 = rkPoint2 - rkPoint0;
00083         normal = kEdge1.crossProduct(kEdge2);
00084         normal.normalise();
00085         d = -normal.dotProduct(rkPoint0);
00086     }
00087     //-----------------------------------------------------------------------
00088     std::ostream& operator<< (std::ostream& o, Plane& p)
00089     {
00090         o << "Plane(normal=" << p.normal << ", d=" << p.d << ")";
00091         return o;
00092     }
00093 } // namespace Ogre

Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:39 2004