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set isosurface {mixed|triangles}
set isosurface {no}insidecolor <n>
Surfaces plotted by the command splot $voxelgrid with isosurface are by
default constructed from a mixture of quadrangles and triangles. The use
of quadrangles creates a less complicated visual impression. This is the
default. This command proveds an option to tessellate with only triangles.
By default the inside of an isosurface is drawn in a separate color.
The method of choosing that color is the same as for hidden3d surfaces,
where an offset 4#4n5#5 is added to the base linetype. To draw both the inside
and outside surfaces in the same color, use set isosurface noinsidecolor.