Martin,
Using depthorder is creative. I'd like to point out that depthorder is only an
approximation to what should be "hidden surfaces". I worked on many aspects of
gnuplot. Although gnuplot does have a hidden line algorithm (i.e., it can
break a mesh into line segments--based on intersections of lines--and discard
those segments which are hidden by a surface), it doesn't have an algorithm
that breaks surfaces into triangles--based on intersections of surfaces--and
discard hidden surfaces. So depthorder is an approximation that quite often
has patch that seems out of place, sticking through a surface it shouldn't, etc.
I've always felt motivated to write a hidden surface algorithm but hadn't found
the time given how much work that would require. Even the syntax "depthorder"
would be nice to deprecate, and instead simply refer to it as "hidden".
It sounds like David Bateman has a lot of knowledge about 3D visualization.
Perhaps a long term project could be started for gnuplot, but it would be a
while before I could work on such a project.
Dan
> ## workaround for visualization with gnuplot
> tmp = tmpnam();
> [fid, msg] = fopen(tmp, "w");
> if ( fid == -1 )
> error("Could not create temporary data file\n%s", msg);
> endif
> for ii = 1:size(T, 1)
> fprintf(fid, "%f %f %f %f\n", p(T(ii,1), 1), p(T(ii,1), 2), p(T(ii,1), 3),
> c(T(ii,1)));
> fprintf(fid, "%f %f %f %f\n\n", p(T(ii,2), 1), p(T(ii,2), 2), p(T(ii,2),
> 3), c(T(ii,2)));
> fprintf(fid, "%f %f %f %f\n", p(T(ii,3), 1), p(T(ii,3), 2), p(T(ii,3), 3),
> c(T(ii,3)));
> fprintf(fid, "%f %f %f %f\n\n\n", p(T(ii,3), 1), p(T(ii,3), 2), p(T(ii,3),
> 3), c(T(ii,3)));
> endfor
> fclose(fid);
> cmd = sprintf("gnuplot -p -e \"set pm3d;set style data pm3d;set pm3d
> depthorder;splot '%s' using 1:2:3:4\"", tmp);
> system(cmd, 0, "async");
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