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List:       gnuplot-info-beta
Subject:    Re: Does "with nohidden3d" work?
From:       Ethan A Merritt <merritt () u ! washington ! edu>
Date:       2008-02-09 5:18:14
Message-ID: 200802082118.15313.merritt () u ! washington ! edu
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On Friday 08 February 2008 20:25, Philipp K. Janert wrote:
> 
> According to the manual (section 34.7 "with"),
> it is possible to use a "with nohidden3d" directive
> together with the splot command to make individual
> surfaces transparent.
> 
> That does not seem to work for me - instead, the
> entire surface disappears.
> 
> Example:
> 
> set hidden3d
> 
> splot [-2:2][-2:2] exp(-x**2-y**2), 0.4-1/(1+x**2+y**2)
> => All good, two opaque surfaces
> 
> splot [-2:2][-2:2] exp(-x**2-y**2), 0.4-1/(1+x**2+y**2) with nohidden3d
> => syntax error! although according to the spec this
> 	should be correct. (I think)

The documentation is perhaps not as clear as it should be, but the
intent is
   set hidden
   splot 'foo' with lines,  'baz' with lines nohidden
or just
   splot 'foo', 'baz' nohidden

I.e., the "nohidden" attribute is not a plot style, it is a modifier to
the plot command proper.

That said, yes it seems to be broken in both 4.2.2 and cvs although in 
different ways.  It does work for "with points", however.
I suppose that's a clue.

 
> splot [-2:2][-2:2] exp(-x**2-y**2), 0.4-1/(1+x**2+y**2) nohidden3d
> => the second surface does not show up at all
> 
> Am I using this option incorrectly?
> 
> Info on my gnuplot version below.
> 
> Best,
> 
> 		Ph.
> 
> 
> 
>         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

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