splot DATA {using x:y:z} with polygons {fillstyle <fillstyle spec>} {fillcolor <colorspec>}
The fill style and color may be specified in the splot command, otherwise the global fillstyle from set style fill is used. Due to limitations in the pm3d code, a single border line style from set pm3d border is applied to all polygons. This restriction may be removed in a later gnuplot version.
pm3d sort order and lighting are applied to the faces. It is probably always desirable to use set pm3d depthsort.
[r][rt][width=3in,keepaspectratio]figure_polygons
set xyplane at 0 set view equal xyz 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