#include #include #include #include #include int main(int argc, char *argv[]) { using namespace Eigen; using namespace std; MatrixXd V; MatrixXi F; igl::readOFF(TUTORIAL_SHARED_PATH "/decimated-knight.off",V,F); // 100 random indices into rows of F VectorXi I; igl::floor((0.5*(VectorXd::Random(100,1).array()+1.)*F.rows()).eval(),I); // 50 random indices into rows of I VectorXi J; igl::floor((0.5*(VectorXd::Random(50,1).array()+1.)*I.rows()).eval(),J); VectorXi K = I(J); // igl::slice(I,J,K); no longer needed // default green for all faces MatrixXd C = RowVector3d(0.4,0.8,0.3).replicate(F.rows(),1); // Red for each in K MatrixXd R = RowVector3d(1.0,0.3,0.3).replicate(K.rows(),1); // C(K,:) = R C(K,Eigen::all) = R; // igl::slice_into(R,K,1,C); no longer needed Eigen::Array W = Eigen::VectorXd::Random(F.rows()).array()>0.5; // Set 1/4 of the colors to blue MatrixXd B = RowVector3d(0.3,0.3,1.0).replicate(W.count(),1); C(igl::find(W),Eigen::all) = B; // Plot the mesh with pseudocolors igl::opengl::glfw::Viewer viewer; viewer.data().set_mesh(V, F); viewer.data().set_colors(C); viewer.launch(); }