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 * 3D数学実装 00022 * @author Junpee 00023 */ 00024 00025 #include "LampBasic.h" 00026 #include "Core/System/Math3D.h" 00027 00028 namespace Lamp{ 00029 00030 //------------------------------------------------------------------------------ 00031 // 法線の計算 00032 Vector3 Math3D::calculateNormal(const Vector3& vertex0, 00033 const Vector3& vertex1, const Vector3& vertex2){ 00034 Vector3 edge0(vertex1), edge1(vertex2); 00035 edge0 -= vertex0; 00036 edge1 -= vertex0; 00037 return edge0.crossProduct(edge1).normalize(); 00038 } 00039 //------------------------------------------------------------------------------ 00040 // Zルックアット回転 00041 Vector3 Math3D::lookAtZ(const Vector3& target){ 00042 Vector3 direction(target); 00043 direction.normalize(); 00044 // return Vector3(Math::asin(direction.y), 00045 // Math::atan2(direction.x, direction.z), 0.f); 00046 return Vector3(Math::asin(-direction.y), 00047 Math::atan2(direction.x, direction.z), 0.f); 00048 } 00049 //------------------------------------------------------------------------------ 00050 } // End of namespace Lamp 00051 //------------------------------------------------------------------------------