79 lines
4.0 KiB
C++
79 lines
4.0 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) 2004-2016 \/)\/ *
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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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/*! \file trimesh_attribute.cpp
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\ingroup code_sample
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\brief the minimal example of using the attributes
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Attributes are a simple mechanism to associate user-defined 'attributes' to the simplicies and to the mesh.
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See the page '\ref attributes' for more details.
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*/
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#include<vcg/complex/complex.h>
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#include<vcg/complex/algorithms/create/platonic.h>
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#include<wrap/io_trimesh/export_ply.h>
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class MyEdge;
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class MyFace;
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class MyVertex;
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struct MyUsedTypes : public vcg::UsedTypes< vcg::Use<MyVertex>::AsVertexType,
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vcg::Use<MyFace> ::AsFaceType>{};
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class MyVertex : public vcg::Vertex< MyUsedTypes, vcg::vertex::Coord3f,vcg::vertex::Normal3f, vcg::vertex::BitFlags>{};
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class MyFace : public vcg::Face< MyUsedTypes, vcg::face::VertexRef, vcg::face::Normal3f, vcg::face::BitFlags> {};
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class MyMesh : public vcg::tri::TriMesh< std::vector<MyVertex>, std::vector<MyFace> > {};
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int main()
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{
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MyMesh m;
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vcg::tri::Torus<MyMesh>(m, 3.0f, 1.0f);
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//! [Adding a few attributes]
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// add a per-vertex attribute with type float named "GaussianCurvature"
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MyMesh::PerVertexAttributeHandle<float>
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hvf = vcg::tri::Allocator<MyMesh>:: GetPerVertexAttribute<float> (m,std::string("GaussianCurvature"));
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MyMesh::PerVertexAttributeHandle<vcg::Point3f>
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hv3f = vcg::tri::Allocator<MyMesh>:: GetPerVertexAttribute<vcg::Point3f> (m,std::string("InvertedNormal"));
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// add a per-face attribute with type float named "FaceArea"
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MyMesh::PerFaceAttributeHandle<float>
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hff = vcg::tri::Allocator<MyMesh>:: GetPerFaceAttribute<float> (m,std::string("FaceArea"));
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//! [filling the attribute]
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vcg::tri::Allocator<MyMesh>::ClearPerVertexAttribute<float>(m,hvf, float(M_PI*2));
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vcg::tri::Allocator<MyMesh>::ClearPerVertexAttribute<vcg::Point3f>(m,hv3f, vcg::Point3f(0,0,0));
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ForEachFace(m, [&](MyFace &f){
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hff[&f]=vcg::DoubleArea(f)*0.5f;
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for(int i=0;i<3;++i){
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hvf[f.V(i)] -= vcg::Angle(f.P1(i)-f.P0(i),f.P2(i)-f.P0(i));
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hv3f[f.V(i)] -= vcg::NormalizedTriangleNormal(f);
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}
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});
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//! [Saving 3 attributes in ply, one of the 3 disguised as quality]
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vcg::tri::io::PlyInfo pi;
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pi.AddPerVertexFloatAttribute("GaussianCurvature","quality");
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pi.AddPerFaceFloatAttribute("FaceArea");
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pi.AddPerVertexPoint3fAttribute(m,"InvertedNormal");
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vcg::tri::io::ExporterPLY<MyMesh>::Save(m,"MeshWithCurvature.ply",false,pi);
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}
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