49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
#include <igl/opengl/glfw/Viewer.h>
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#include <igl/copyleft/tetgen/tetrahedralize.h>
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#include <igl/readOBJ.h>
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#include <igl/marching_tets.h>
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#include <Eigen/Core>
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#include "tutorial_shared_path.h"
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int main(int argc, char * argv[])
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{
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// Load a surface mesh which is a cube
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Eigen::MatrixXd surfaceV;
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Eigen::MatrixXi surfaceF;
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igl::readOBJ(TUTORIAL_SHARED_PATH "/cube.obj", surfaceV, surfaceF);
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// Find the centroid of the loaded mesh
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Eigen::RowVector3d surfaceCenter = surfaceV.colwise().sum() / surfaceV.rows();
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// Center the mesh about the origin
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surfaceV.rowwise() -= surfaceCenter;
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// Tetrahedralize the surface mesh
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Eigen::MatrixXd TV; // Tet mesh vertices
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Eigen::MatrixXi TF; // Tet mesh boundary face indices
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Eigen::MatrixXi TT; // Tet mesh tetrahedron indices
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igl::copyleft::tetgen::tetrahedralize(surfaceV, surfaceF, "pq1.414a0.0001", TV, TT, TF);
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// Compute a scalar at each tet vertex which is the distance from the vertex to the origin
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Eigen::VectorXd S = TV.rowwise().norm();
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// Compute a mesh (stored in SV, SF) representing the iso-level-set for the isovalue 0.5
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Eigen::MatrixXd SV;
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Eigen::MatrixXi SF;
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igl::marching_tets(TV, TT, S, 0.45, SV, SF);
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// Draw the mesh stored in (SV, SF)
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igl::opengl::glfw::Viewer viewer;
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viewer.data().set_mesh(SV, SF);
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viewer.callback_key_down =
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[&](igl::opengl::glfw::Viewer & viewer, unsigned char key, int mod)->bool
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{
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viewer.data().set_face_based(true);
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return true;
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};
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viewer.launch();
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}
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