branches/exact/examples/extra/superellipsoid.cc

   1 // Superellipsoid example code
   2 //
   3 // Author   : Chris H. Rycroft (LBL / UC Berkeley)
   4 // Email    : chr@alum.mit.edu
   5 // Date     : August 30th 2011
   6
   7 #include "voro++.hh"
   8 using namespace voro;
   9
  10 // This function returns a random floating point number between 0 and 1
  11 double rnd() {return double(rand())/RAND_MAX;}
  12
  13 int main() {
  14         double x,y,z,rsq,r;
  15         voronoicell v;
  16
  17         // Initialize the Voronoi cell to be a cube of side length 2, centered
  18         // on the origin
  19         v.init(-1,1,-1,1,-1,1);
  20
  21         // Cut the cell by 5000 random planes that are scaled to create a
  22         // superellipsoid
  23         for(int i=0;i<5000;i++) {
  24                 x=2*rnd()-1;
  25                 y=2*rnd()-1;
  26                 z=2*rnd()-1;
  27                 rsq=x*x*x*x+y*y*y*y+z*z*z*z;
  28                 if(rsq>0.01&&rsq<1) {
  29                         r=1/sqrt(sqrt(rsq));
  30                         x*=r;y*=r;z*=r;
  31                         v.plane(x*x*x,y*y*y,z*z*z,x*x*x*x+y*y*y*y+z*z*z*z);
  32                 }
  33         }
  34
  35         // Output the Voronoi cell to a file, in the gnuplot format
  36         v.draw_gnuplot(0,0,0,"superellipsoid.gnu");
  37
  38         // Output the Voronoi cell to a file in POV-Ray formats
  39         v.draw_pov(0,0,0,"superellipsoid_v.pov");
  40         v.draw_pov_mesh(0,0,0,"superellipsoid_m.pov");
  41 }