191 lines
5.6 KiB
C++
191 lines
5.6 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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Revision 1.1 2004/03/05 10:59:24 cignoni
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Changed name from plural to singular (normals->normal)
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Revision 1.1 2004/03/04 00:05:50 cignoni
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First working version!
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Revision 1.1 2004/02/19 13:11:06 cignoni
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Initial commit
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****************************************************************************/
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#ifndef __VCG_TRI_UPDATE_NORMALS
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#define __VCG_TRI_UPDATE_NORMALS
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namespace vcg {
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namespace tri {
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/** \addtogroup trimesh */
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/*@{*/
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/// Management, updating and computation of per-vertex and per-face normals.
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/// This class is used to compute or update the normals that can be stored in the vertex or face component of a mesh.
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template <class ComputeMeshType>
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class UpdateNormals
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{
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public:
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typedef ComputeMeshType MeshType;
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typedef typename MeshType::VertexType VertexType;
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typedef typename MeshType::VertexPointer VertexPointer;
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typedef typename MeshType::VertexIterator VertexIterator;
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typedef typename MeshType::FaceType FaceType;
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typedef typename MeshType::FacePointer FacePointer;
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typedef typename MeshType::FaceIterator FaceIterator;
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/// Calculates the vertex normal (if stored in the current face type)
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static void PerFace(ComputeMeshType &m)
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{
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if( !m.HasPerFaceNormal()) return;
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FaceIterator f;
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for(f=m.face.begin();f!=m.face.end();++f)
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if( !(*f).IsD() ) (*f).ComputeNormal();
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}
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/// Calculates the vertex normal. Without exploiting or touching face normals
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/// The normal of a vertex v is the weigthed average of the normals of the faces incident on v.
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static void PerVertex(ComputeMeshType &m)
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{
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if( !m.HasPerVertexNormal()) return;
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VertexIterator vi;
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for(vi=m.vert.begin();vi!=m.vert.end();++vi)
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if( !(*vi).IsD() && (*vi).IsRW() )
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(*vi).N() = VertexType::NormalType(0,0,0);
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FaceIterator f;
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for(f=m.face.begin();f!=m.face.end();++f)
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if( !(*f).IsD() && (*f).IsR() )
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{
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FaceType::NormalType t = (*f).Normal();
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for(int j=0; j<3; ++j)
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if( !(*f).V(j)->IsD() && (*f).V(j)->IsRW() )
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(*f).V(j)->N() += t;
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}
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}
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/// Calculates both vertex and face normals.
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/// The normal of a vertex v is the weigthed average of the normals of the faces incident on v.
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static void PerVertexPerFace(ComputeMeshType &m)
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{
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if( !m.HasPerVertexNormal() || !m.HasPerFaceNormal()) return;
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PerFace(m);
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VertexIterator vi;
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for(vi=m.vert.begin();vi!=m.vert.end();++vi)
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if( !(*vi).IsD() && (*vi).IsRW() )
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(*vi).N() = VertexType::NormalType(0,0,0);
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FaceIterator f;
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for(f=m.face.begin();f!=m.face.end();++f)
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if( !(*f).IsD() && (*f).IsR() )
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{
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for(int j=0; j<3; ++j)
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if( !(*f).V(j)->IsD() && (*f).V(j)->IsRW() )
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(*f).V(j)->N() += (*f).cN();
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}
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}
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static void PerFaceRW(ComputeMeshType &m, bool normalize=false)
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{
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if( !m.HasPerFaceNormal()) return;
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FaceIterator f;
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bool cn = true;
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if(normalize)
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{
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for(f=m.m.face.begin();f!=m.m.face.end();++f)
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if( !(*f).IsD() && (*f).IsRW() )
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{
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for(int j=0; j<3); ++j)
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if( !(*f).V(j)->IsR()) cn = false;
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if( cn ) (*f).ComputeNormalizedNormal();
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cn = true;
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}
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}
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else
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{
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for(f=m.m.face.begin();f!=m.m.face.end();++f)
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if( !(*f).IsD() && (*f).IsRW() )
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{
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for(int j=0; j<3; ++j)
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if( !(*f).V(j)->IsR()) cn = false;
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if( cn )
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(*f).ComputeNormal();
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cn = true;
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}
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}
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}
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static void PerFaceNormalized(ComputeMeshType &m)
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{
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if( !m.HasPerFaceNormal()) return;
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FaceIterator f;
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for(f=m.face.begin();f!=m.face.end();++f)
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if( !(*f).IsD() ) (*f).ComputeNormalizedNormal();
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}
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/// Calculates the vertex normal
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static void PerVertexNormalized(ComputeMeshType &m)
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{
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if( !m.HasPerVertexNormal()) return;
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PerVertex(m);
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for(VertexIterator vi=m.vert.begin();vi!=m.vert.end();++vi)
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if( !(*vi).IsD() && (*vi).IsRW() )
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(*vi).N().Normalize();
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}
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void ComputeE()
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{
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FaceIterator f;
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for(f = m.face.begin(); f!=m.face.end(); ++f)
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(*f).ComputeE();
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}
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}; // end class
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} // End namespace
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} // End namespace
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#endif
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