00001 //------------------------------------------------------------------------------ 00002 // Lamp : Open source game middleware 00003 // Copyright (C) 2004 Junpei Ohtani ( Email : junpee@users.sourceforge.jp ) 00004 // 00005 // This library is free software; you can redistribute it and/or 00006 // modify it under the terms of the GNU Lesser General Public 00007 // License as published by the Free Software Foundation; either 00008 // version 2.1 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 // Lesser General Public License for more details. 00014 // 00015 // You should have received a copy of the GNU Lesser General Public 00016 // License along with this library; if not, write to the Free Software 00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00018 //------------------------------------------------------------------------------ 00019 00020 /** @file 00021 * 平面交差実装 00022 * @author Junpee 00023 */ 00024 00025 #include "LampBasic.h" 00026 #include "Geometry/Intersection/PlaneIntersection.h" 00027 00028 namespace Lamp{ 00029 00030 //------------------------------------------------------------------------------ 00031 // 点 00032 //------------------------------------------------------------------------------ 00033 // 点交差 00034 bool PlaneIntersection::intersect( 00035 const Plane& plane, const Vector3& point, float range){ 00036 Assert(false); 00037 return false; 00038 } 00039 //------------------------------------------------------------------------------ 00040 // 平面 00041 //------------------------------------------------------------------------------ 00042 // 平面交差 00043 bool PlaneIntersection::intersect(const Plane& plane0, const Plane& plane1){ 00044 // 面が平行でなければ交差している 00045 Vector3 cross = plane0.getNormal().crossProduct(plane1.getNormal()); 00046 return (cross.getSquaredLength() > Math::epsilon); 00047 } 00048 //------------------------------------------------------------------------------ 00049 // レイ 00050 //------------------------------------------------------------------------------ 00051 // レイ交差 00052 bool PlaneIntersection::intersect(const Plane& plane, const Ray& ray){ 00053 const Vector3& normal = plane.getNormal(); 00054 float denominator = ray.getDirection().dotProduct(normal); 00055 float distance = plane.getDistance(ray.getOrigin()); 00056 if(Math::abs(denominator) <= Math::epsilon){ 00057 // 面に平行なレイは原点が面に接していれば交差 00058 return (Math::abs(distance) <= Math::epsilon); 00059 } 00060 float t = ((-distance) / denominator); 00061 // tが0以上なら交差 00062 return (t >= 0.f); 00063 } 00064 //------------------------------------------------------------------------------ 00065 // セグメント 00066 //------------------------------------------------------------------------------ 00067 // セグメント交差 00068 bool PlaneIntersection::intersect(const Plane& plane, const Segment& segment){ 00069 const Vector3& normal = plane.getNormal(); 00070 float denominator = segment.getDirection().dotProduct(normal); 00071 float distance = plane.getDistance(segment.getOrigin()); 00072 if(Math::abs(denominator) <= Math::epsilon){ 00073 // 面に平行なセグメントは原点が面に接していれば交差 00074 return (Math::abs(distance) <= Math::epsilon); 00075 } 00076 float t = ((-distance) / denominator); 00077 // tが0以上1以下なら交差 00078 return ((t >= 0.f) && (t <= 1.f)); 00079 } 00080 //------------------------------------------------------------------------------ 00081 // 球 00082 //------------------------------------------------------------------------------ 00083 // 球交差 00084 bool PlaneIntersection::intersect(const Plane& plane, const Sphere& sphere){ 00085 // 面と球の距離が球半径以内なら交差 00086 float distance = plane.getDistance(sphere.getCenter()); 00087 return (Math::abs(distance) <= sphere.getRadius()); 00088 } 00089 //------------------------------------------------------------------------------ 00090 // 三角 00091 //------------------------------------------------------------------------------ 00092 // 三角交差 00093 bool PlaneIntersection::intersect(const Plane& plane, const Triangle& triangle){ 00094 Assert(false); 00095 return false; 00096 } 00097 //------------------------------------------------------------------------------ 00098 } // End of namespace Lamp 00099 //------------------------------------------------------------------------------