trunk/examples/walls/tetrahedron.cc

   1 // Tetrahedron 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 // Set up constants for the container geometry
  11 const double x_min=-2,x_max=2;
  12 const double y_min=-2,y_max=2;
  13 const double z_min=-2,z_max=2;
  14
  15 // Set up the number of blocks that the container is divided
  16 // into
  17 const int n_x=7,n_y=7,n_z=7;
  18
  19 // Set the number of particles that are going to be randomly
  20 // introduced
  21 const int particles=64;
  22
  23 // This function returns a random double between 0 and 1
  24 double rnd() {return double(rand())/RAND_MAX;}
  25
  26 int main() {
  27         int i=0;
  28         double x,y,z;
  29
  30         // Create a container with the geometry given above, and make it
  31         // non-periodic in each of the three coordinates. Allocate space for 8
  32         // particles within each computational block.
  33         container con(x_min,x_max,y_min,y_max,z_min,z_max,n_x,n_y,n_z,
  34                         false,false,false,8);
  35
  36         // Add four plane walls to the container to make a tetrahedron
  37         wall_plane p1(1,1,1,1);con.add_wall(p1);
  38         wall_plane p2(-1,-1,1,1);con.add_wall(p2);
  39         wall_plane p3(1,-1,-1,1);con.add_wall(p3);
  40         wall_plane p4(-1,1,-1,1);con.add_wall(p4);
  41
  42         // Randomly insert particles into the container, checking that they lie
  43         // inside the tetrahedron
  44         while(i<particles) {
  45                 x=x_min+rnd()*(x_max-x_min);
  46                 y=y_min+rnd()*(y_max-y_min);
  47                 z=z_min+rnd()*(z_max-z_min);
  48                 if (con.point_inside(x,y,z)) {
  49                         con.put(i,x,y,z);i++;
  50                 }
  51         }
  52
  53         // Output the particle positions and the Voronoi cells in Gnuplot and
  54         // POV-Ray formats
  55         con.draw_particles("tetrahedron_p.gnu");
  56         con.draw_cells_gnuplot("tetrahedron_v.gnu");
  57         con.draw_particles_pov("tetrahedron_p.pov");
  58         con.draw_cells_pov("tetrahedron_v.pov");
  59 }