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Math3D.cpp

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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 //------------------------------------------------------------------------------

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