74 lines
1.9 KiB
C++
Executable File
74 lines
1.9 KiB
C++
Executable File
#include <igl/readOFF.h>
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#include <igl/viewer/Viewer.h>
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#include <igl/embree/EmbreeIntersector.h>
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#include <igl/embree/unproject_onto_mesh.h>
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#include <algorithm>
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// Mesh
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Eigen::MatrixXd V;
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Eigen::MatrixXi F;
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// Per-vertex color
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Eigen::MatrixXd C;
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igl::embree::EmbreeIntersector* ei;
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std::vector<int> picked_vertices;
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bool mouse_down(igl::viewer::Viewer& viewer, int button, int modifier)
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{
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using namespace Eigen;
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using namespace std;
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int vid, fid;
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// Cast a ray in the view direction starting from the mouse position
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double x = viewer.current_mouse_x;
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double y = viewer.core.viewport(3) - viewer.current_mouse_y;
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bool hit = igl::embree::unproject_onto_mesh(Vector2f(x,y),
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F,
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viewer.core.view * viewer.core.model,
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viewer.core.proj,
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viewer.core.viewport,
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*ei,
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fid,
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vid);
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// If the ray hits a face, assign a red color to the closest vertex
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if (hit)
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{
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cerr << "Picked face(vertex): " << fid << " (" << vid << ")" << endl;
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C.row(vid) << 1,0,0;
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viewer.data.set_colors(C);
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return true;
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}
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return false;
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}
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int main(int argc, char *argv[])
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{
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using namespace Eigen;
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using namespace std;
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// Load a mesh in OFF format
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igl::readOFF("../shared/fertility.off", V, F);
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// Create a BVH for raycasting
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ei = new igl::embree::EmbreeIntersector();
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ei->init(V.cast<float>(),F);
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// Initialize the colors to white for all vertices
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C = MatrixXd::Constant(V.rows(),3,1);
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// Show mesh
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igl::viewer::Viewer viewer;
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viewer.data.set_mesh(V, F);
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viewer.callback_mouse_down = &mouse_down;
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viewer.data.set_colors(C);
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viewer.core.show_lines = false;
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viewer.launch();
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}
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