[Sidefx-houdini-list] Practical RAT size limits

Frederic Servant frederic.servant at gmail.com
Thu Aug 20 09:52:31 EDT 2009


Hi Mark,

I store my intermediate results in .rat files. I use the sequence and mosaic
cops to assemble the images.
--
Frederic Servant
R&D Engineer
La Maison
www.alamaison.fr

On Thu, Aug 20, 2009 at 3:34 PM, Mark Elendt <mark at sidefx.com> wrote:

> On Thursday Aug 20 at 12:42, Frederic Servant wrote:
> > Hi list,
> >
> > I'm trying to assemble  huge RAT maps (80000 x 40000) but it seems I hit
> a
> > wall if any dimension exceeds ~32000 pixels (2^15?).
> >
> > Does anyone have more insight of the limitations of the RAT file format
> and
> > / or COP processing generally in houdini, dimension-wise?
>
> I was able to generate a 40000x40000 .rat file which seems to work (on
> my 32-bit machine).  In a terminal:
>
>    % icomposite -w 40000 -h 40000 c.rat = $HH/pic/circle.pic
>
> will generate a 40Kx40K image.  This appears to be correct (when I
> access it as a texture).  So, I'm guessing that you're running into
> issues in other parts of the process.
>
> Some image formats store their resolution as 16-bit integers (maximum
> resolution of 32767).  Are you storing intermediate results in
> temporary files (i.e. .bmp files have a maximum resolution of 32K)?
>
> --
> Mark Elendt
>
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