surface problem (?)

[Kai Habel]

Hello all,

I noticed a strange problem with surf/mesh today. Can someone confirm
the following behavior?

I use today's tip. (hg pull + hg update) and gnuplot 4.2.3.

The command sequences below should all plot all the surface you would
get from "mesh(peaks)" but in some case it does not.

Lets start with the first example:

octave:1> s=surf(peaks)
s = -2.7829
octave:2> set(s,'FaceColor','w')
octave:3> set(s,'EdgeColor','flat')               <-- red mesh!
octave:4> drawnow("wxt","/dev/null",false,"/tmp/mesh1.gp")
octave:5> clf
octave:6> s=surf(peaks)
s = -5.4186
octave:7> set(s,'EdgeColor','flat')
octave:8> set(s,'FaceColor','w')                  <-- red mesh!
octave:9> drawnow("wxt","/dev/null",false,"/tmp/mesh2.gp")

After command #3 I see a red colored mesh with hidden line removal.
After command #8 I see the same red colored mesh as before. In both
cases I would have expected a mesh with a color determined by the z-value.

But now the strange sequence, at least here on my PC.

octave:1> s=surf(peaks)
s = -2.2645
octave:2> set(s,'EdgeColor','flat')
octave:3> set(s,'FaceColor','w')          <- o.k
octave:4> drawnow("wxt","/dev/null",false,"/tmp/mesh3.gp")
octave:5> clf
octave:6> s=surf(peaks)
s = -5.3517
octave:7> set(s,'FaceColor','w')
octave:8> set(s,'EdgeColor','flat')   <- red mesh
octave:9> drawnow("wxt","/dev/null",false,"/tmp/mesh4.gp")

After command #3 I see the correct surface (!) and after command #8 the
red mesh again.

All files "/tmp/mesh{1|2|3|4}.gp" are identical.

address@hidden:~$ diff -u /tmp/mesh1.gp /tmp/mesh2.gp
address@hidden:~$ diff -u /tmp/mesh1.gp /tmp/mesh3.gp
address@hidden:~$ diff -u /tmp/mesh1.gp /tmp/mesh4.gp

And if I load the file in gnuplot the surface looks o.k.

address@hidden:~$ gnuplot

        G N U P L O T
        Version 4.2 patchlevel 3
        last modified Mar 2008
        System: Linux 2.6.22.17-0.1-default

        Copyright (C) 1986 - 1993, 1998, 2004, 2007, 2008
        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>


Terminal type set to 'wxt'
gnuplot> load "/tmp/mesh1.gp"
gnuplot> load "/tmp/mesh2.gp"
gnuplot> load "/tmp/mesh3.gp"
gnuplot> load "/tmp/mesh4.gp"


So, can someone confirm this behavior? Any ideas where to look at?

Kai