74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
#include <igl/marching_cubes.h>
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#include <iostream>
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#include <cstdio>
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#include "igl/MCTables.hh"
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typedef float ScalarType;
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typedef unsigned IndexType;
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int main(int argc, char * argv[])
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{
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Eigen::Matrix<ScalarType, 1, 3> bb_min, bb_max;
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bb_min<<0.,0.,0.;
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bb_max<<1.,1.,1.;
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//diagonal
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Eigen::Matrix<ScalarType, 1, 3> diff = bb_max - bb_min;
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//center of the sphere
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Eigen::Matrix<ScalarType, 1, 3> center = 0.5 * (bb_min + bb_max);
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IndexType xres, yres, zres;
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xres = yres = zres = 10;
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ScalarType radius = 0.42;
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//steps in x,y,z direction
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ScalarType dx = diff[0] / (ScalarType)(xres-1);
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ScalarType dy = diff[1] / (ScalarType)(yres-1);
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ScalarType dz = diff[2] / (ScalarType)(zres-1);
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Eigen::Matrix<ScalarType, Eigen::Dynamic, 3> points(xres*yres*zres,3);
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Eigen::Matrix<ScalarType, Eigen::Dynamic, 1> values(xres*yres*zres,1);
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Eigen::Matrix<ScalarType, Eigen::Dynamic, 3> vertices;
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Eigen::Matrix<IndexType, Eigen::Dynamic, 3> faces;
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std::cerr<<"Sphere -- construct grid"<<std::endl;
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for (unsigned int x=0; x<xres; ++x)
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for (unsigned int y=0; y<yres; ++y)
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for (unsigned int z=0; z<zres; ++z)
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{
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int index = x + y*xres + z*xres*yres;
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points.row(index) = bb_min +
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ScalarType(x)*Eigen::Matrix<ScalarType, 1, 3>(dx,0.,0.) +
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ScalarType(y)*Eigen::Matrix<ScalarType, 1, 3>(0.,dy,0.) +
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ScalarType(z)*Eigen::Matrix<ScalarType, 1, 3>(0.,0.,dz);
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values[index] = (points.row(index) - center).squaredNorm() - radius*radius;
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}
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std::cerr<<"Sphere -- marching cubes"<<std::endl;
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igl::marching_cubes(values,
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points,
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xres,
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yres,
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zres,
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vertices,
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faces);
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std::cerr<<"Sphere -- saving"<<std::endl;
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FILE * fid = fopen("sphere.obj","w");
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for (unsigned i = 0; i<vertices.rows(); ++i)
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fprintf(fid,"v %.10g %.10g %.10g\n",vertices(i,0),vertices(i,1),vertices(i,2));
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for (unsigned i = 0; i<faces.rows(); ++i)
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fprintf(fid,"f %d %d %d\n",faces(i,0)+1,faces(i,1)+1,faces(i,2)+1);
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fclose(fid);
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std::cerr<<"Sphere -- done."<<std::endl;
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return 0;
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}
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