CGAL 6.2 - Triangulated Surface Mesh Deformation

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Surface_mesh_deformation/deform_mesh_for_botsch08_format_sre_arap.cpp
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Polyhedron_items_with_id_3.h>
#include <CGAL/Surface_mesh_deformation.h>
#include <fstream>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef CGAL::Polyhedron_3<Kernel, CGAL::Polyhedron_items_with_id_3> Polyhedron;
typedef boost::graph_traits<Polyhedron>::vertex_descriptor vertex_descriptor;
typedef boost::graph_traits<Polyhedron>::vertex_iterator vertex_iterator;
typedef CGAL::Surface_mesh_deformation<Polyhedron,CGAL::Default, CGAL::Default, CGAL::SRE_ARAP> Surface_mesh_deformation;
int main(int argc,char** argv)
{
std::string off_name=CGAL::data_file_path("meshes/cactus.off"),
sel_name="data/cactus.sel",
def_name="data/cactus.def";
if ( argc!=4){
std::cerr <<"Usage " << argv[0] << " input.off input.sel input.def\n";
std::cerr <<"Using default values: " << off_name << " " << sel_name << " " << def_name << "\n";
}
else
{
off_name=argv[1];
sel_name=argv[2];
def_name=argv[3];
}
Polyhedron mesh;
std::ifstream input(off_name);
if ( !input || !(input >> mesh) || mesh.empty() ) {
std::cerr<< off_name << " is not a valid off file" << std::endl;
return 1;
}
input.close();
// Init the indices of the halfedges and the vertices.
set_halfedgeds_items_id(mesh);
// Create a deformation object
Surface_mesh_deformation deform_mesh(mesh);
// Changing alpha value
deform_mesh.set_sre_arap_alpha(0.02);
// Definition of the region of interest (use the whole mesh)
vertex_iterator vb,ve;
std::tie(vb, ve) = vertices(mesh);
//the selection is set by a file
input.open(sel_name);
std::string line;
std::vector<vertex_descriptor> control_vertices;
while(getline(input, line))
{
if (line[0]=='#') continue;
if (line[0]=='1') deform_mesh.insert_roi_vertex(*vb);
if (line[0]=='2') {
deform_mesh.insert_control_vertex(*vb);
control_vertices.push_back(*vb);
}
++vb;
if (vb==ve) break;
}
input.close();
std::cout << "Using " << control_vertices.size() << " control vertices\n";
// The definition of the ROI and the control vertices is done, call preprocess
bool is_matrix_factorization_OK = deform_mesh.preprocess();
if(!is_matrix_factorization_OK){
std::cerr << "Error in preprocessing, check documentation of preprocess()" << std::endl;
return 1;
}
//define the transformation
input.open(def_name);
double m00, m01, m02, m03, m10, m11, m12, m13, m20, m21, m22, m23, hw, sink;
getline(input, line); // skip first comment line
input >> m00 >> m01 >> m02 >> m03;
input >> m10 >> m11 >> m12 >> m13;
input >> m20 >> m21 >> m22 >> m23;
input >> sink >> sink >> sink >> hw;
std::cout << "Setting target positions\n";
Kernel::Aff_transformation_3 aff(m00, m01, m02, m03, m10, m11, m12, m13, m20, m21, m22, m23);
for(vertex_descriptor vd : control_vertices)
{
Surface_mesh_deformation::Point pos = vd->point().transform(aff);
deform_mesh.set_target_position(vd, pos);
}
// Call the function deform() with one-time parameters:
std::cout << "Deforming the mesh\n";
deform_mesh.deform(1000, 1e-4);
// Save the deformed mesh into a file
std::ofstream output("deform_res.off");
output << mesh;
output.close();
}
CGAL::Polyhedron_3
CGAL::Surface_mesh_deformation
Class providing the functionalities for deforming a triangulated surface mesh.
Definition: Surface_mesh_deformation.h:205
Kernel
CGAL::Simple_cartesian