torus.pov
706c4ccdaefdefficient_neuronet

torus.pov
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			#version 3.6;

			// Increase the trace level for more accurate reflections
			global_settings {
			max_trace_level 64
			}

			// Right-handed coordinate system in which the z-axis points upwards
			camera {
			location <0,-40,34>
			sky z
			right -0.4ximage_width/image_height
			up 0.4*z
			look_at <0,0,-1.31>
			}

			// White background
			background{rgb 1}

			// Two lights with slightly different colors
			light_source{<-16,-20,43> color rgb <0.72,0.69,0.69>}
			light_source{<30,-15,12> color rgb <0.34,0.37,0.37>}

			// Radius of the Voronoi cell network, and the particle radius
			#declare r=0.06;
			#declare s=0.5;

			// Particles
			union{
			#include "torus_p.pov"
			pigment{rgb 0.97}
			finish{reflection 0.1 ambient 0.30 specular 0.3}
			}

			// Voronoi cells, using a radial pigment map
			union{
			#include "torus_v.pov"
			pigment{radial pigment_map {
			[0 rgb <0.5,0.7,1>]
			[0.25 rgb <0.38,0.82,0.92>]
			[0.5 rgb <0.5,0.7,1>]
			[0.75 rgb <0.65,0.4,1>]
			[1 rgb <0.5,0.7,1>]}
			rotate <270,0,0>}
			finish{specular 0.3 ambient 0.3 reflection 0.1}
			}