frustum.cc
706c4ccdaefdefficient_neuronet

frustum.cc
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			// Frustum example code
			//
			// Author : Chris H. Rycroft (LBL / UC Berkeley)
			// 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(-1.2,1.2,-1.2,1.2,0,1,14,14,7,
			false,false,false,8);

			// Add a cylindrical wall to the container
			wall_cone cone(0,0,2,0,0,-1,atan(0.5));
			con.add_wall(cone);

			// Place particles in a regular grid within the frustum, for points
			// which are within the wall boundaries
			for(z=0.1;z<1;z+=0.2) for(y=-0.85;y<1;y+=0.2) for(x=-0.95;x<1;x+=0.2) {
			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("frustum_p.gnu");
			con.draw_cells_gnuplot("frustum_v.gnu");

			// Output the particle positions and Voronoi cells in POV-Ray format
			con.draw_particles_pov("frustum_p.pov");
			con.draw_cells_pov("frustum_v.pov");

			// Compute the volume of the Voronoi cells and compare it to the
			// exact frustum volume
			evol=pi1(0.50.5+0.51+1*1)/3;
			vvol=con.sum_cell_volumes();
			printf("Exact frustum volume : %g\n"
			"Voronoi cell volume : %g\n"
			"Difference : %g\n",evol,vvol,vvol-evol);
			}