139 lines
3.4 KiB
C++
Executable File
139 lines
3.4 KiB
C++
Executable File
#include <igl/readOBJ.h>
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#include <igl/readDMAT.h>
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#include <igl/viewer/Viewer.h>
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#include <igl/barycenter.h>
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#include <igl/avg_edge_length.h>
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#include <vector>
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#include <igl/n_polyvector_general.h>
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#include <igl/n_polyvector.h>
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#include <igl/local_basis.h>
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#include <stdlib.h>
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#include <igl/jet.h>
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#include <fstream>
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// Input mesh
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Eigen::MatrixXd V;
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Eigen::MatrixXi F;
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// Per face bases
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Eigen::MatrixXd B1,B2,B3;
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// Face barycenters
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Eigen::MatrixXd B;
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// Scale for visualizing the fields
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double global_scale;
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// Random length factor
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double rand_factor = 5;
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// Create a random set of tangent vectors
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Eigen::VectorXd random_constraints(const
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Eigen::VectorXd& b1, const
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Eigen::VectorXd& b2, int n)
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{
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Eigen::VectorXd r(n*3);
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for (unsigned i=0; i<n;++i)
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{
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double a = (double(rand())/RAND_MAX)*2*M_PI;
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double s = 1 + ((double(rand())/RAND_MAX)) * rand_factor;
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Eigen::Vector3d t = s * (cos(a) * b1 + sin(a) * b2);
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r.block(i*3,0,3,1) = t;
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}
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return r;
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}
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bool key_down(igl::Viewer& viewer, unsigned char key, int modifier)
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{
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using namespace std;
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using namespace Eigen;
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if (key <'1' || key >'8')
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return false;
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viewer.data.lines.resize(0,9);
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int num = key - '0';
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// Interpolate
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cerr << "Interpolating " << num << "-PolyVector field" << endl;
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VectorXi b(3);
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b << 1511, 603, 506;
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int numConstraintsToGenerate;
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// if it's not a 2-PV or a 1-PV, include a line direction (2 opposite vectors)
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// in the field
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if (num>=5)
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numConstraintsToGenerate = num-2;
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else
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if (num>=3)
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numConstraintsToGenerate = num-1;
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else
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numConstraintsToGenerate = num;
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MatrixXd bc(b.size(),numConstraintsToGenerate*3);
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for (unsigned i=0; i<b.size(); ++i)
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{
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VectorXd t = random_constraints(B1.row(b(i)),B2.row(b(i)),numConstraintsToGenerate);
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bc.row(i) = t;
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}
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VectorXi rootsIndex(num);
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for (int i =0; i<numConstraintsToGenerate; ++i)
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rootsIndex[i] = i+1;
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if (num>=5)
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rootsIndex[num-2] = -2;
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if (num>=3)
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rootsIndex[num-1] = -1;
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// Interpolated PolyVector field
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Eigen::MatrixXd pvf;
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igl::n_polyvector_general(V, F, b, bc, rootsIndex, pvf);
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// Highlight in red the constrained faces
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MatrixXd C = MatrixXd::Constant(F.rows(),3,1);
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for (unsigned i=0; i<b.size();++i)
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C.row(b(i)) << 1, 0, 0;
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viewer.data.set_colors(C);
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for (int n=0; n<num; ++n)
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{
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const MatrixXd &VF = pvf.block(0,n*3,F.rows(),3);
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VectorXd c = VF.rowwise().norm();
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MatrixXd C2;
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igl::jet(c,1,1+rand_factor,C2);
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// viewer.data.add_edges(B - global_scale*VF, B + global_scale*VF , C2);
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viewer.data.add_edges(B, B + global_scale*VF , C2);
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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 OBJ format
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igl::readOBJ("../../shared/snail.obj", V, F);
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// Compute local basis for faces
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igl::local_basis(V,F,B1,B2,B3);
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// Compute face barycenters
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igl::barycenter(V, F, B);
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// Compute scale for visualizing fields
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global_scale = .1*igl::avg_edge_length(V, F);
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// Make the example deterministic
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srand(0);
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igl::Viewer viewer;
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viewer.data.set_mesh(V, F);
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viewer.callback_key_down = &key_down;
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viewer.core.show_lines = false;
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key_down(viewer,'3',0);
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viewer.launch();
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}
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