pm3d face and line color control or surface color

[Daniel J S. <dan...@ie...>]

I have a question for anyone who might know how pm3d color can be 
controlled.  I'm trying to do something that is actually rather simple, 
which is basically a 3D surface plot with a color different from 
white/background.  Think of a typical hidden3d surface plot but with the 
interior of the mesh elements with a color other than white.

I can get something close using pm3d, but not exactly.  Also, pm3d has 
the limitation of not working so well with hidden3d, but that's of 
secondary importance.  In the demo

rgb_variable.dem

are a couple examples where the pm3d colors can be controlled with color 
information in a file.  It is something like this:

with pm3d lc rgb variable

and with RGB values in the data file, all having the same value, the 
pm3d plot does come out to have the correct color.  It's a bit odd in 
the sense that "lc" or "linecolor" controls the face color, rather than 
some line color.  Unfortunately, the lines used in the pm3d plot seems 
random, perhaps, or not controllable as far as I can tell.  I try 
something like

with pm3d lc rgb variable linestyle 2

and that cause pm3d to go back to using palette lookup for the color 
(which is at the extreme end of the palette because RGB triples work out 
to very large numbers).

Is there some way of controlling face color and line color in pm3d at 
the moment?

Dan