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46 lines
1.2 KiB
46 lines
1.2 KiB
1 year ago
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#include <igl/readOFF.h>
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#include <igl/unproject_onto_mesh.h>
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#include <igl/opengl/glfw/Viewer.h>
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#include <iostream>
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int main(int argc, char *argv[])
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{
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// Mesh with per-face color
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Eigen::MatrixXd V, C;
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Eigen::MatrixXi F;
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// Load a mesh in OFF format
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igl::readOFF(TUTORIAL_SHARED_PATH "/fertility.off", V, F);
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// Initialize white
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C = Eigen::MatrixXd::Constant(F.rows(),3,1);
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igl::opengl::glfw::Viewer viewer;
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viewer.callback_mouse_down =
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[&V,&F,&C](igl::opengl::glfw::Viewer& viewer, int, int)->bool
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{
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int fid;
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Eigen::Vector3f bc;
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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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if(igl::unproject_onto_mesh(Eigen::Vector2f(x,y), viewer.core().view,
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viewer.core().proj, viewer.core().viewport, V, F, fid, bc))
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{
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// paint hit red
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C.row(fid)<<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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std::cout<<R"(Usage:
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[click] Pick face on shape
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)";
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// Show mesh
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viewer.data().set_mesh(V, F);
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viewer.data().set_colors(C);
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viewer.data().show_lines = false;
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viewer.launch();
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}
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