Alec Jacobson
dbba9ca921
* copyleft::marching_cubes -> marching_cubes * restor imguizmo * fix doc; lambda return type
93 lines
2.6 KiB
C++
Executable File
93 lines
2.6 KiB
C++
Executable File
#include <igl/marching_cubes.h>
|
|
#include <igl/signed_distance.h>
|
|
#include <igl/read_triangle_mesh.h>
|
|
#include <igl/opengl/glfw/Viewer.h>
|
|
#include <Eigen/Core>
|
|
#include <iostream>
|
|
|
|
#include "tutorial_shared_path.h"
|
|
|
|
int main(int argc, char * argv[])
|
|
{
|
|
using namespace Eigen;
|
|
using namespace std;
|
|
using namespace igl;
|
|
MatrixXi F;
|
|
MatrixXd V;
|
|
// Read in inputs as double precision floating point meshes
|
|
read_triangle_mesh(
|
|
TUTORIAL_SHARED_PATH "/armadillo.obj",V,F);
|
|
// number of vertices on the largest side
|
|
const int s = 50;
|
|
const RowVector3d Vmin = V.colwise().minCoeff();
|
|
const RowVector3d Vmax = V.colwise().maxCoeff();
|
|
const double h = (Vmax-Vmin).maxCoeff()/(double)s;
|
|
const RowVector3i res = (s*((Vmax-Vmin)/(Vmax-Vmin).maxCoeff())).cast<int>();
|
|
// create grid
|
|
cout<<"Creating grid..."<<endl;
|
|
MatrixXd GV(res(0)*res(1)*res(2),3);
|
|
for(int zi = 0;zi<res(2);zi++)
|
|
{
|
|
const auto lerp = [&](const int di, const int d)->double
|
|
{return Vmin(d)+(double)di/(double)(res(d)-1)*(Vmax(d)-Vmin(d));};
|
|
const double z = lerp(zi,2);
|
|
for(int yi = 0;yi<res(1);yi++)
|
|
{
|
|
const double y = lerp(yi,1);
|
|
for(int xi = 0;xi<res(0);xi++)
|
|
{
|
|
const double x = lerp(xi,0);
|
|
GV.row(xi+res(0)*(yi + res(1)*zi)) = RowVector3d(x,y,z);
|
|
}
|
|
}
|
|
}
|
|
// compute values
|
|
cout<<"Computing distances..."<<endl;
|
|
VectorXd S,B;
|
|
{
|
|
VectorXi I;
|
|
MatrixXd C,N;
|
|
signed_distance(GV,V,F,SIGNED_DISTANCE_TYPE_PSEUDONORMAL,S,I,C,N);
|
|
// Convert distances to binary inside-outside data --> aliasing artifacts
|
|
B = S;
|
|
for_each(B.data(),B.data()+B.size(),[](double& b){b=(b>0?1:(b<0?-1:0));});
|
|
}
|
|
cout<<"Marching cubes..."<<endl;
|
|
MatrixXd SV,BV;
|
|
MatrixXi SF,BF;
|
|
igl::marching_cubes(S,GV,res(0),res(1),res(2),0,SV,SF);
|
|
igl::marching_cubes(B,GV,res(0),res(1),res(2),0,BV,BF);
|
|
|
|
cout<<R"(Usage:
|
|
'1' Show original mesh.
|
|
'2' Show marching cubes contour of signed distance.
|
|
'3' Show marching cubes contour of indicator function.
|
|
)";
|
|
igl::opengl::glfw::Viewer viewer;
|
|
viewer.data().set_mesh(SV,SF);
|
|
viewer.callback_key_down =
|
|
[&](igl::opengl::glfw::Viewer & viewer, unsigned char key, int mod)->bool
|
|
{
|
|
switch(key)
|
|
{
|
|
default:
|
|
return false;
|
|
case '1':
|
|
viewer.data().clear();
|
|
viewer.data().set_mesh(V,F);
|
|
break;
|
|
case '2':
|
|
viewer.data().clear();
|
|
viewer.data().set_mesh(SV,SF);
|
|
break;
|
|
case '3':
|
|
viewer.data().clear();
|
|
viewer.data().set_mesh(BV,BF);
|
|
break;
|
|
}
|
|
viewer.data().set_face_based(true);
|
|
return true;
|
|
};
|
|
viewer.launch();
|
|
}
|