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lscm_parametrization.h: first version.

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mtarini 2014-12-22 15:25:30 +00:00
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/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2014 \/)\/ *
* 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. *
* *
****************************************************************************/
/* Optimizes given UV-mapping with
* [Least Square Conformal Maps]
* (minimizes angle distrotions).
*
* Needs:
* (-) per-vertex texture coords
* (-) some fixed boundary:
* Fixed vertices are the flagged ones.
* By default: (use fixedMask parameter to customize)
* BORDER or SELECTED verts are fixed.
*
* Example of usage:
* MyMesh m;
* vcg::tri::UpdateFlags< MyMesh >::VertexBorderFromNone( m );
* vcg::tri::OptimizeUV_LSCM( m );
*
*/
#include <igl/lscm.h>
#include <vcg/complex/algorithms/mesh_to_matrix.h>
namespace vcg{
namespace tri{
template<class MeshType >
void OptimizeUV_LSCM( MeshType& m ,
unsigned int fixedMask =
MeshType::VertexType::BORDER |
MeshType::VertexType::SELECTED
)
{
// check requirements
vcg::tri::VertexVectorHasPerVertexTexCoord( m.vert );
vcg::tri::VertexVectorHasPerVertexFlags( m.vert );
Eigen::MatrixXd V;
Eigen::MatrixXi F;
Eigen::VectorXi b;
Eigen::MatrixXd bc;
Eigen::MatrixXd V_uv;
vcg::tri::MeshToMatrix< MeshType >::GetTriMeshData( m, F, V );
// build fixed points data
int nFixed = 0;
for (int i=0; i<(int)m.vert.size(); i++) {
if (m.vert[i].Flags()&fixedMask) nFixed++;
}
// all fixed, nothing to do? get out to avoid crashes
if (nFixed == m.vert.size()) return;
b.resize(nFixed);
bc.resize(nFixed,2);
for (int i=0,k=0; i<(int)m.vert.size(); i++) {
if (m.vert[i].Flags()&fixedMask) {
b(k) = i;
bc(k,0) = m.vert[i].T().P()[0];
bc(k,1) = m.vert[i].T().P()[1];
k++;
}
}
// apply Least Square Conformal Maps
::igl::lscm(V,F,b,bc,V_uv);
// copy results back to mesh
for (int i=0; i<(int)m.vert.size(); i++) {
m.vert[i].T().P()[0] = V_uv(i,0);
m.vert[i].T().P()[1] = V_uv(i,1);
}
}
}} // namespaces