gnuplot-info

[Gnuplot-info] hidden3d rendering -- hiding too much?

[macro <tw...@gm...>]

Hi folks,

First, many, many thanks to the creators of the excellent gnuplot.  I'm new
to gnuplot but quickly realizing it's a great tool.

I have a matrix that I want to 'splot' 'with lines palette'.  It works just
beautifully if I limit the x & y range.  However, when I splot the entire
matrix (300 x 300 ish), hidden3d causes some of the mesh to disappear.  Here
is a simple script that does the same:

  reset
  set hidden3d
  set isosamples 300
  splot sin(sqrt(x*x+y*y))/sqrt(x*x+y*y) with lines palette

I'm running:
        G N U P L O T
        Version 4.4 patchlevel 2 (Gentoo revision r0)
        last modified Wed Nov 10 22:40:48 EST 2010
        System: Linux 2.6.36-gentoo-r5

Any tips appreciated.  Is it possible to use "pm3d at s depthorder" but with
white fill?  (This is analogous to an approach I've used in the past.)

Thanks!

-- 
View this message in context: http://old.nabble.com/hidden3d-rendering----hiding-too-much--tp30649897p30649897.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] hidden3d rendering -- hiding too much?

[Hans-Bernhard B. <HBB...@t-...>]

On 12.01.2011 03:24, macro wrote:

> I have a matrix that I want to 'splot' 'with lines palette'.  It works just
> beautifully if I limit the x&  y range.  However, when I splot the entire
> matrix (300 x 300 ish), hidden3d causes some of the mesh to disappear.

That's at least partly caused by 300x300 being way too high a resolution 
for this plot.  That plots consists of just about nothing but sub-pixel 
fragments of lines, the tiniest of which apparently the drawing engine 
refuses to actually output.

For a wireframe drawing to make sense, both technically and visually, 
there has to be at least a bit of white space between the lines.  At 
300x300 isosamples for that function, there just about isn't any.

Re: [Gnuplot-info] hidden3d rendering -- hiding too much?

[macro <tw...@gm...>]

Hans-Bernhard Bröker-2 wrote:
> 
> On 12.01.2011 03:24, macro wrote:
> 
>> I have a matrix that I want to 'splot' 'with lines palette'.  It works
>> just
>> beautifully if I limit the x&  y range.  However, when I splot the entire
>> matrix (300 x 300 ish), hidden3d causes some of the mesh to disappear.
> 
> That plots consists of just about nothing but sub-pixel
> fragments of lines, the tiniest of which apparently the drawing engine
> refuses to actually output.
> 

I tried a high-res bitmap output thinking more pixels might help.  It was
essentially the same.  Postscript didn't help either.



> For a wireframe drawing to make sense, both technically and visually, 
> there has to be at least a bit of white space between the lines.
> 

Hmm, can't say I agree with that assertion.  My thinking is that if the
whitespace gets too small, it should disappear, not take over.  In other
words, data should win, not whitespace.  These plots are currently done in
Matlab, and they look very good (some parts do become solid color -- and
that's okay).


-- 
View this message in context: http://old.nabble.com/hidden3d-rendering----hiding-too-much--tp30649897p30658794.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.