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Depthorder
By default the quadrangles making up a pm3d solid surface are rendered in the
order they are encountered along the surface grid points. This order may be
controlled by the options scansautomatic3#3scansforward3#3scansbackward.
These scan options are not in general compatible with hidden-surface removal.
Gnuplot does not do true hidden surface removal for solid surfaces, but often
it is sufficient to render the component quadrangles in order from furthest
to closest. This mode may be selected using the options
set pm3d depthorder hidden3d
The depthorder option orders the solid quadrangles; the hidden3d option
similarly orders the bounding lines (if drawn). Note that the global option
set hidden3d does not affect pm3d surfaces.
2012-01-19