set xyplane at 0;
set view equal xyz;
set view 70,40,1,1
unset border;
unset tics;
set pm3d depth;
set pm3d border lc "black" lw 1.5;
splot 'icosahedron.dat' with polygons fs transparent solid 0.8 fc bgnd;

1. 正四面体　04-regular-tetrahedron.dat
2. 正六面体 06-regular-hexahedron.dat
3. 正八面体 08-regular-octahedron.dat
4. 正十二面体 12-regular-dodecahedron.dat
5. 正二十面体　20-regular-icosahedron.dat