b0fd49d598
* Start CMake refactoring. * WIP on instlal(). * Handle install + hunter setup. * Handle module options + igl_include helper. * Build all tutorials again. * Update CMake for unit tests. * Update triangle lib. * Update Hunter integration. * Fix for header-only mode. * Fix Windows compilation + add GMP/MPFR find_package + set VS folders. * Fix CGAL build. * Add copy dll for Windows + improve find gmp/mpfr. * Update Github Actions. * Update README. * Fixes for CMake 3.18 * Fix include option. * Rename libigl_imgui_front to avoid conflicts. * Fix when disabling unit tests. * Build imguizmo with C++11. * Update CMake option comments. * Rename nonfree -> restricted. * Update triangle and tetgen versions. * Fix compilation issue. * Update continuous.yml * remove cork * finding matlab with default * mosek module compiles; default detected; osx dylib hack * Reduce build parallelism. * Fix find GMP/MPFR on Windows + cleanup CGAL changes. * Update readme. Co-authored-by: Alec Jacobson <alecjacobson@adobe.com> Co-authored-by: Alec Jacobson <alecjacobson@gmail.com>
52 lines
1.4 KiB
C++
Executable File
52 lines
1.4 KiB
C++
Executable File
#include <igl/avg_edge_length.h>
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#include <igl/barycenter.h>
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#include <igl/grad.h>
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#include <igl/jet.h>
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#include <igl/readDMAT.h>
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#include <igl/readOFF.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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using namespace Eigen;
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using namespace std;
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MatrixXd V;
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MatrixXi F;
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// Load a mesh in OFF format
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igl::readOFF(TUTORIAL_SHARED_PATH "/cheburashka.off", V, F);
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// Read scalar function values from a file, U: #V by 1
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VectorXd U;
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igl::readDMAT(TUTORIAL_SHARED_PATH "/cheburashka-scalar.dmat",U);
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// Compute gradient operator: #F*3 by #V
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SparseMatrix<double> G;
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igl::grad(V,F,G);
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// Compute gradient of U
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MatrixXd GU = Map<const MatrixXd>((G*U).eval().data(),F.rows(),3);
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// Compute gradient magnitude
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const VectorXd GU_mag = GU.rowwise().norm();
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igl::opengl::glfw::Viewer viewer;
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viewer.data().set_mesh(V, F);
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viewer.data().set_data(U);
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// Average edge length divided by average gradient (for scaling)
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const double max_size = igl::avg_edge_length(V,F) / GU_mag.mean();
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// Draw a black segment in direction of gradient at face barycenters
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MatrixXd BC;
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igl::barycenter(V,F,BC);
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const RowVector3d black(0,0,0);
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viewer.data().add_edges(BC,BC+max_size*GU, black);
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// Hide wireframe
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viewer.data().show_lines = false;
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viewer.launch();
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}
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