[Maxima-bugs] [maxima:bugs] #4594 Maxima-5.48.1 Breaks Draw3d With Surface_Hide=True

[F R. <fru...@us...>]

I filed a bug report with Gnuplot and indeed it was a Gnuplot error.  The issue is now fixed.

However, you may want to review the Gnuplot report as it may have some relevance on how Maxima generates its draw3d() scripts:

https://sourceforge.net/p/gnuplot/bugs/2836/




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**[bugs:#4594] Maxima-5.48.1 Breaks Draw3d With Surface_Hide=True**

**Status:** wont-fix
**Group:** None
**Labels:** draw3d gnuplot 
**Created:** Wed Aug 13, 2025 02:53 PM UTC by F Russell
**Last Updated:** Thu Oct 09, 2025 07:54 PM UTC
**Owner:** nobody
**Attachments:**

- [maxout8523.gnuplot](https://sourceforge.net/p/maxima/bugs/4594/attachment/maxout8523.gnuplot) (1.0 kB; application/x-gnuplot)


After upgrading to maxima-5.48.1 all of my draw3d graphics that contain the "surface_hide=true" option now broken.  Only the axes are shown.  The surface is not drawn.

The example command is:

load(draw)$
draw3d(xrange=[-2,2], yrange=[-2,2], surface_hide=true, explicit(x^2-y^2, x, -1, 1, y, -1, 1))$

I have traced the problem to the "set pm3d at s depthorder explicit" line in the maxoutXXX.gnuplot file.  This file is passed to gnuplot and the plot fails without error but no surface is shown.

If I comment https://sourceforge.net/p/maxima/bugs/4297/out the above mentioned line the surface plot will succeed.

This was supposed to have been fixed with this report:

https://sourceforge.net/p/maxima/bugs/4297/

However, the problem persists with draw3d.

I am using maxima-5.48.1 and gnuplot-6.0.3.



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