Re: [Gnuplot-info] maxima + gnupolot: 3D rendering bug?

[Stanislav M. <sta...@gm...>]

On Tue, 2010-12-07 at 11:51 +0000, Stanislav Maslovski wrote:
> Hello,
> 
> Can anyone advise me on how can I workaround the problem with 3D
> rendering in the plot [1]? The problem is that the surfaces that must be
> hidden are seen in this plot (to clearly see them,
> load "maxout.gnuplot" and try rotating the plot).
> 
> The plot was generated in maxima, using the draw3d command. Any help
> will be very much appreciated!
> 
> [1] http://zalil.ru/30094104 (wait 10 secs, and download will start)

Replying to myself: actually, after reading some docs (and the code) I
realized that it was a limitation of the rendering algorithm used by the
gnuplot (a variant of painter's algorithm). So, I solved this issue by
patching pm3d.c:pm3d_depth_queue_flush() so that sorting of quadrangles
was done based on the average depth of 4 corners.

It would be nice if this could be made configurable. I will probably
come out with a patch in the next couple of days to enable this feature.

--
Stanislav