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// Sphere example code
//
// Author : Chris H. Rycroft (Harvard SEAS)
// Email : chr@alum.mit.edu
// Date : August 30th 2011
#include "voro++.hh"
using namespace voro;
const double pi=3.1415926535897932384626433832795;
int main() {
int i=0;
double x,y,z,evol,vvol;
// Create a container with the geometry given above, and make it
// non-periodic in each of the three coordinates. Allocate space for
// eight particles within each computational block.
container con(-5,5,-5,5,-5,5,6,6,6,
false,false,false,8);
// Add a cylindrical wall to the container
wall_sphere sph(0,0,0,4);
con.add_wall(sph);
// Place particles in a regular grid within the frustum, for points
// which are within the wall boundaries
for(z=-4.5;z<5;z+=1) for(y=-4.5;y<5;y+=1) for(x=-4.5;x<5;x+=1) {
if (con.point_inside(x,y,z)) {
con.put(i,x,y,z);i++;
}
}
// Output the particle positions and Voronoi cells in Gnuplot format
con.draw_particles("sphere_p.gnu");
con.draw_cells_gnuplot("sphere_v.gnu");
// Compute the volume of the Voronoi cells and compare it to the
// exact frustum volume
evol=4/3.0*pi*4*4*4;
vvol=con.sum_cell_volumes();
printf("Exact sphere volume : %g\n"
"Voronoi cell volume : %g\n"
"Difference : %g\n",evol,vvol,vvol-evol);
}