Added sample to show how to save in PLY a given PerVertex or PerFace attribute

This commit is contained in:
Paolo Cignoni 2018-02-13 19:44:49 +01:00
parent 4768a26558
commit db7394d19b
3 changed files with 74 additions and 0 deletions

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TEMPLATE = subdirs
SUBDIRS = trimesh_allocate \
trimesh_attribute \
trimesh_attribute_saving \
trimesh_ball_pivoting \
trimesh_base \
trimesh_closest \

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/****************************************************************************
* 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 using the attributes
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/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;
Torus<MyMesh>(m, 3.0f, 1.0f);
//! [Adding an attribute]
// add a per-vertex attribute with type float named "GaussianCurvature"
MyMesh::PerVertexAttributeHandle<float>
hv = vcg::tri::Allocator<MyMesh>:: GetPerVertexAttribute<float> (m,std::string("GaussianCurvature"));
// add a per-face attribute with type float named "FaceArea"
MyMesh::PerFaceAttributeHandle<float>
hf = vcg::tri::Allocator<MyMesh>:: GetPerFaceAttribute<float> (m,std::string("FaceArea"));
//! [filling the attribute]
vcg::tri::Allocator<MyMesh>::ClearPerVertexAttribute<float>(m,hv, float(M_PI*2));
ForEachFace(m, [&](MyFace &f){
hf[&f]=vcg::DoubleArea(f)*0.5f;
for(int i=0;i<3;++i)
hv[f.V(i)] -= vcg::Angle(f.P1(i)-f.P0(i),f.P2(i)-f.P0(i));
});
//! [Saving two attributes in ply, one of the two disguised as quality]
vcg::tri::io::PlyInfo pi;
pi.AddPerVertexFloatAttribute("GaussianCurvature","quality");
pi.AddPerFaceFloatAttribute("FaceArea");
vcg::tri::io::ExporterPLY<MyMesh>::Save(m,"MeshWithCurvature.ply",true,pi);
}

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include(../common.pri)
TARGET = trimesh_attribute_saving
SOURCES += trimesh_attribute_saving.cpp ../../../wrap/ply/plylib.cpp