Re: Ggnuplot-beta@lists.sourceforge.netnuplot crashing for "hidden3d undefined" ?

[Ethan A M. <merritt@u.washington.edu>]

On Wednesday 24 October 2007 21:44, Philipp K. Janert wrote:
> 
> The following two commands will crash 
> gnuplot:
> 	set hidden3d undefined 2
> 	splot [][][:1] 10*exp(-(x**2 + y**2))

I'm afraid I don't know what the 'undefined' option is supposed
to do, so I can't comment on whether this is supposed to work.

> Gnuplot dies with the following message:
> 	hidden3d.c:776: store_polygon: Assertion `p->ymax <= surface_scale' failed.

But that message arises, I think, simply because of the range and
scale used for plotting.  I've been getting this message a lot
recently if I use the middle mouse button in splot mode to try
to rescale the plot.

I have tried replacing the assert statements with non-fatal
warnings. That allows many mouse operations to succeed that 
otherwise would have triggered the assertion failure, but
eventually it dies elsewhere on a segfault.

So yes, there are serious known problems with the
hidden3d scaling code.  But I think that the 'undefined'
option is not the cause; it just perturbs the chance of
hitting the true bug.

 
> Note that the plot command is such that
> there are values of the function outside
> the plot range (z-range).
> 
> I get the same effect for 
> 	set hidden3d undefined 2
> and
> 	set hidden3d undefined 3
> Only level = 1 is ok.
> 
> This occurs for both wxt and x11 terminals.
> (I didn't try any others.)
> 
> Is this a known problem?
> 
> Best,
> 
> 		Ph.
> 
> 
> 
> 
> 
> 
> Below the output of show version long:
> 
>         G N U P L O T
>         Version 4.2 patchlevel 2 
>         last modified 31 Aug 2007
>         System: Linux 2.6.18.2-34-default
> 
>         Copyright (C) 1986 - 1993, 1998, 2004, 2007
>         Thomas Williams, Colin Kelley and many others
> 
>         Type `help` to access the on-line reference manual.
>         The gnuplot FAQ is available from http://www.gnuplot.info/faq/
> 
>         Send bug reports and suggestions to 
> <http://sourceforge.net/projects/gnuplot>
> 
> Compile options:
> -READLINE  +LIBREADLINE  +HISTORY  +BACKWARDS_COMPATIBILITY  +BINARY_DATA  
> +GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION  
> -NOCWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +USE_MOUSE  +HIDDEN3D_QUADTREE  
> +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE  
> 
> 
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-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742