Polygons

2D plots:

    plot DATA {using 1:2} with polygons

plot with polygons is currently treated as plot with filledcurves closed. Each polygon may be assigned a separate color by providing a third using specifier and the keywords lc variable (value is interpreted as a linetype) or lc rgb variable (value is interpreted as a 24-bit RGB color). Only the color value from the first vertex of the polygon is used. The border line type, if any, is taken from the fill style.

3D plots:

    splot DATA {using x:y:z} with polygons
          {fillstyle <fillstyle spec>}
          {fillcolor <colorspec>}

splot with polygons uses pm3d to render individual triangles, quadrangles, and larger polygons in 3D. These may be facets of a 3D surface or isolated shapes. The code assumes that the vertices lie in a plane. Vertices defining individual polygons are read from successive records of the input file. A blank line separates one polygon from the next. Due to limitations in the pm3d code, a single border line style from set pm3d border is applied to all 3D 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