On Thu, Jun 9, 2016 at 2:33 PM, Larry Gritz <[email protected]> wrote:
>
>
> I'd never heard or thought of the multipart UDIMs. That's a neat idea, I'm
> sure we can make that work somehow. It seems in that case that you want to
> give it the one and only true filename (no translation necessary), but then
> have the UDIM tile select a subimage ("part", in EXR terminology). I think
> that if we build this into maketx somehow, it can also add an attribute
> into the header that identifies it as a UDIM file.
>
> IIRC, OpenEXR multi-part files are not allowed to have differing
> resolutions for the parts. Is this not a fatal flaw here? Or in practice is
> that not a problem for you? I would have thought that allowing the
> different "tiles" to have differing resolutions (higher res for tiles
> corresponding to large pieces of the model, etc) would be typical for UDIM
> practice. No?
>
>
At one time there was a requirement that only the display windows were the
same, not necessarily the resolution of the data. So prior to calling the
'exrmultipart' command, we used 'oiiotool --fullsize' to set all display
windows to that of the highest resolution in the file set. But then that
requirement was lifted, at least as of version 2.1.0 we no longer have to
set the display windows equal. From this doc:
http://www.openexr.com/TechnicalIntroduction.pdf
"An OpenEXR file may contain multiple independent images or “parts” with
different sets of image channels, resolutions and data compression methods."
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