add vcglib

vcglib/apps/sample/trimesh_attribute_ply/trimesh_attribute_ply.cpp

@@ -0,0 +1,122 @@
+/****************************************************************************
+* VCGLib                                                            o o     *
+* Visual and Computer Graphics Library                            o     o   *
+*                                                                _   O  _   *
+* Copyright(C) 2004-2016                                           \/)\/    *
+* Visual Computing Lab                                            /\/|      *
+* ISTI - Italian National Research Council                           |      *
+*                                                                    \      *
+* All rights reserved.                                                      *
+*                                                                           *
+* This program is free software; you can redistribute it and/or modify      *
+* it under the terms of the GNU General Public License as published by      *
+* the Free Software Foundation; either version 2 of the License, or         *
+* (at your option) any later version.                                       *
+*                                                                           *
+* This program is distributed in the hope that it will be useful,           *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
+* GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
+* for more details.                                                         *
+*                                                                           *
+****************************************************************************/
+/*! \file trimesh_attribute.cpp
+\ingroup code_sample
+
+\brief the minimal example of saving and loading attributes into PLY
+
+Attributes are a simple mechanism to associate user-defined 'attributes' to the simplicies and to the mesh.
+See the page '\ref attributes' for more details.
+*/
+
+#include<vcg/complex/complex.h>
+#include<vcg/complex/algorithms/create/platonic.h>
+#include<wrap/io_trimesh/import_ply.h>
+#include<wrap/io_trimesh/export_ply.h>
+class MyEdge;
+class MyFace;
+class MyVertex;
+struct MyUsedTypes : public vcg::UsedTypes<	vcg::Use<MyVertex>::AsVertexType,
+                                            vcg::Use<MyFace>  ::AsFaceType>{};
+
+class MyVertex  : public vcg::Vertex< MyUsedTypes, vcg::vertex::Coord3f,vcg::vertex::Normal3f, vcg::vertex::BitFlags>{};
+class MyFace    : public vcg::Face< MyUsedTypes, vcg::face::VertexRef, vcg::face::Normal3f, vcg::face::BitFlags> {};
+
+class MyMesh : public vcg::tri::TriMesh< std::vector<MyVertex>, std::vector<MyFace> > {};
+int main()
+{
+  MyMesh m;
+  vcg::tri::Torus<MyMesh>(m, 3.0f, 1.0f);
+  //! [Adding a few attributes]
+  // add a per-vertex attribute with type float named "GaussianCurvature"
+  MyMesh::PerVertexAttributeHandle<float> 
+      hvf = vcg::tri::Allocator<MyMesh>:: GetPerVertexAttribute<float> (m,std::string("GaussianCurvature"));
+  
+  MyMesh::PerVertexAttributeHandle<vcg::Point3f> 
+      hv3f = vcg::tri::Allocator<MyMesh>:: GetPerVertexAttribute<vcg::Point3f> (m,std::string("InvertedNormal"));
+  
+  // add a per-face attribute with type float named "FaceArea"
+  MyMesh::PerFaceAttributeHandle<float> 
+      hff = vcg::tri::Allocator<MyMesh>:: GetPerFaceAttribute<float> (m,std::string("FaceArea"));
+  //! [filling the attributes]
+  vcg::tri::Allocator<MyMesh>::ClearPerVertexAttribute<float>(m,hvf, float(M_PI*2));
+  vcg::tri::Allocator<MyMesh>::ClearPerVertexAttribute<vcg::Point3f>(m,hv3f, vcg::Point3f(0,0,0));
+  
+  ForEachFace(m, [&](MyFace &f){
+    hff[&f]=vcg::DoubleArea(f)*0.5f;
+    for(int i=0;i<3;++i){
+      hvf[f.V(i)] -= vcg::Angle(f.P1(i)-f.P0(i),f.P2(i)-f.P0(i)); 
+      hv3f[f.V(i)] -= vcg::NormalizedTriangleNormal(f);
+    }
+  }); 
+  
+  //! [Saving 3 attributes in ply, one of the 3 is saved as the standard ply property quality]
+  vcg::tri::io::PlyInfo pi;
+  
+  // // The first attribute is a per-vertex float attribute named "GaussianCurvature" and is saved as quality even if this mesh has not quality
+  // pi.AddPerVertexFloatAttribute("GaussianCurvature","quality");
+  pi.AddPerVertexFloatAttribute("GaussianCurvature");
+  pi.AddPerFaceFloatAttribute("FaceArea");
+  pi.AddPerVertexPoint3fAttribute(m,"InvertedNormal");
+  vcg::tri::io::ExporterPLY<MyMesh>::Save(m,"MeshWithCurvature.ply",false,pi);
+  
+  printf("Face 0 has area %f\n",hff[&m.face[0]]);
+  printf("Vertex 1 has GaussianCurvature %f\n",hvf[1]);
+  
+  /******************************************************************************/
+  
+  //! Now Trying to reload it in a new mesh
+  MyMesh mi;
+  //! use an attribute with a slightly different name for testing
+  MyMesh::PerFaceAttributeHandle<float> 
+      ihff = vcg::tri::Allocator<MyMesh>:: GetPerFaceAttribute<float> (mi,std::string("MyFaceArea"));
+  
+  MyMesh::PerVertexAttributeHandle<float> 
+      ihvf = vcg::tri::Allocator<MyMesh>:: GetPerVertexAttribute<float> (mi,std::string("GaussianCurvature"));
+  
+  vcg::tri::io::PlyInfo piOpen0;
+  // Use load Mask to get info about the file
+  int mask=0;
+  vcg::tri::io::ImporterPLY<MyMesh>::LoadMask("MeshWithCurvature.ply",mask,piOpen0);
+  
+  
+  
+  vcg::tri::io::PlyInfo piOpen;
+  piOpen.AddPerFaceFloatAttribute("MyFaceArea", "FaceArea");
+  piOpen.AddPerVertexFloatAttribute("GaussianCurvature");
+  piOpen.AddPerVertexPoint3fAttribute(mi,"InvertedNormal");
+  
+  
+  int ret = vcg::tri::io::ImporterPLY<MyMesh>::Open(mi,"MeshWithCurvature.ply",piOpen);
+  if(ret!=0)
+  {
+    printf("Unable to open MeshWithCurvature.ply for '%s'\n",vcg::tri::io::ImporterPLY<MyMesh>::ErrorMsg(ret));
+    return -1;
+  }
+  
+  printf("Loaded %i vertices and %i faces\n",mi.VN(),mi.FN());
+  printf("Face 0 has area %f\n",ihff[&mi.face[0]]);
+  printf("Vertex 1 has GaussianCurvature %f\n",ihvf[1]);
+  
+  
+}