Re: [Visualpython-users] Why no screenshot function?

[John Z. <joh...@wa...>]

Hi All,

Bruce is certainly right that for publication quality images, something like 
the POVray export is the way to go. However, for animations I have to agree 
with those who suggest the benefit of some window grab utility. A resolution 
of 1024x768 or even 640x480 (ala Youtube) is plenty good for demonstration 
movies. We frequently use these in our stereo visualizations. 

I use the PIL image grab method on Windows and xwd on linux for grabbing 
frames. It would be nice to have a platform independent way of doing this for 
any Vpython visualization. So I give a +1 to consideration this feature in a 
future version.

--John

On Monday 19 October 2009 20:44:01 Bruce Sherwood wrote:
> But that's the fundamental problem. If I understand your note correctly,
> you want "decent image resolution". The only way I know to get that is to
> use ray-tracing, through POV-ray, which is time-consuming, but no bitmap
> image can give comparable results. Moreover, the real-time shading in
> Visual is no match for ray-tracing, no matter what the resolution in dots
> per inch.
>
> However, as was pointed out you might be able to get by with using a very
> large Visual window on a very large monitor, if the dots per inch is
> adequate for your purposes and you can tolerate the shading and lighting
> done by Visual.
>
> Bruce Sherwood
>
> Samuel Pelaez wrote:
> > Hi guys,
> >
> > I definetly agree with Anders. In my work I use Visual to make an
> > animation of the time evolution of a system of particles. In order to
> > save such an animation I must save each frame using the povexport module
> > and then compile every frame with povray. Finally I create the proper
> > gif animation.
> >
> > However the povray compilation is very time-consuming if you want to get
> > a decent image resolution. If there is a "native" way (as native as
> > C/C++ can be in vpython) to take screenshots within vpython, it would
> > make things easier and most probably less time-expensive.
> >
> > Samuel.
> >
> >> El 19 de oct de 2009, 10:31 p.m., "Guy K. Kloss" <g....@ma...
> >> <mailto:g....@ma...>> escribió:
> >>
> >> On Tue, 20 Oct 2009 09:23:41 Anders Wallin wrote: > Could this perhaps
> >> be wrapped as a separate pyth...
> >>
> >> Visual is mainly C/C++. So I assume that could (easily) be added and
> >> exposed
> >> through the Boost.Python wrappers to make it all work.
> >>
> >> Guy -- Guy K. Kloss Institute of Information and Mathematical Sciences
> >> Te Kura Pūtaiao o Mōhiohio...
> >>
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-- 
John M. Zelle, Ph.D.             Wartburg College
Professor of Computer Science    Waverly, IA
joh...@wa...          (319) 352-8360