[Sidefx-houdini-list] Practical RAT size limits

Frederic Servant frederic.servant at gmail.com
Wed Aug 26 19:33:51 EDT 2009


Quick update: I was finally able to generate 80k x 40k .rat maps by writting
a raw image loader derived from the HDK sample IMG_Raw and using the icp
command to convert to .rat, nothing else worked for me.
--
Frederic Servant
R&D Engineer
La Maison
www.alamaison.fr


On Thu, Aug 20, 2009 at 3:52 PM, Frederic Servant <
frederic.servant at gmail.com> wrote:

> 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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>>
>
>



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