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74 lines
1.7 KiB
74 lines
1.7 KiB
#include <igl/eigs.h>
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#include <igl/cotmatrix.h>
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#include <igl/massmatrix.h>
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#include <igl/opengl/glfw/Viewer.h>
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#include <igl/parula.h>
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#include <igl/read_triangle_mesh.h>
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#include <Eigen/Sparse>
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#include <iostream>
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#include <queue>
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Eigen::MatrixXd V,U;
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Eigen::MatrixXi F;
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int c=0;
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double bbd = 1;
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bool twod = 0;
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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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using namespace igl;
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VectorXd D;
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if(!read_triangle_mesh(
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argc>1?argv[1]: TUTORIAL_SHARED_PATH "/beetle.off",V,F))
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{
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cout<<"failed to load mesh"<<endl;
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}
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twod = V.col(2).minCoeff()==V.col(2).maxCoeff();
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bbd = (V.colwise().maxCoeff()-V.colwise().minCoeff()).norm();
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SparseMatrix<double> L,M;
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cotmatrix(V,F,L);
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L = (-L).eval();
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massmatrix(V,F,MASSMATRIX_TYPE_DEFAULT,M);
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const size_t k = 5;
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if(!eigs(L,M,k+1,EIGS_TYPE_SM,U,D))
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{
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cout<<"failed."<<endl;
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}
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// Normalize
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U = ((U.array()-U.minCoeff())/(U.maxCoeff()-U.minCoeff())).eval();
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igl::opengl::glfw::Viewer viewer;
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viewer.callback_key_down = [&](igl::opengl::glfw::Viewer & viewer,unsigned char key,int)->bool
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{
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switch(key)
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{
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default:
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return false;
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case ' ':
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{
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U = U.rightCols(k).eval();
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// Rescale eigen vectors for visualization
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VectorXd Z =
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bbd*0.5*U.col(c);
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if(twod)
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{
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V.col(2) = Z;
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viewer.data().set_mesh(V,F);
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viewer.data().compute_normals();
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}
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viewer.data().set_data(U.col(c).eval());
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c = (c+1)%U.cols();
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return true;
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}
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}
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};
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viewer.data().set_mesh(V,F);
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viewer.callback_key_down(viewer,' ',0);
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viewer.data().show_lines = false;
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std::cout<<
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R"(
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[space] Cycle through eigen modes
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)";
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viewer.launch();
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}
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