woops, forgot to include the link to the tool:
http://antimentalray.livejournal.com

looks like it has to be compiled though :/

-----
Deke Kincaid
Creative Specialist
The Foundry
Mobile: (310) 883 4313
Tel: (310) 399 4555 - Fax: (310) 450 4516

The Foundry Visionmongers Ltd.
Registered in England and Wales No: 4642027


On Thu, Jan 31, 2013 at 11:51 AM, Deke Kincaid <[email protected]>wrote:

> Mango: Last I knew you had to write an output shader for mental ray to
> calculate this and it is not done by default.  It is easiest to wrap this
> up into a post conversion script when you convert the file to scanline.  In
> Nuke you can hit “x” and type “autocrop” and it will analyze the sequence
> and create a bbox which you can then write out.
>
> This guy wrote a little tool called exr4nuke which does this automatically
> for you:
>
>
> There is a plugin for MR in Maya called “Mental Core” which allows you to
> write out scanline exr’s, embedded camera metadata (not sure about adding
> the bbox/datawindow).
> http://core-cg.com/
> http://core-cg.com/documentation/refpasses.html#compositing-render-passes
>
> Also from doing some more research, it appears that Mental Ray defaults
> now to outputting scanline exr files with zips compression.  I’m not sure
> which version though as even the nvidia people from the thread below think
> it is possibly in Maya 2013 but not sure if it actually made it into it:
>
> http://forum.nvidia-arc.com/showthread.php?9434-OpenExr-and-zip-scanline-compressions&highlight=nukehttp://forum.nvidia-arc.com/showthread.php?9434-OpenExr-and-zip-scanline-compressions&highlight=nuke
>
> -----
> Deke Kincaid
> Creative Specialist
> The Foundry
> Mobile: (310) 883 4313
> Tel: (310) 399 4555 - Fax: (310) 450 4516
>
> The Foundry Visionmongers Ltd.
> Registered in England and Wales No: 4642027
>
>
> On Thu, Jan 31, 2013 at 10:48 AM, Magno Borgo <[email protected]> wrote:
>
>>  **
>> Let me ask something related to the thread.
>> My EXRs  coming from maya2013 /mental ray renders do not have bounding
>> box, am I missing some rendering option to get that?
>>
>> Magno.
>>
>>
>>
>>  Well, as Deke mentioned, this option may just be applying ZIP
>> compression to the individual tiles, as opposed to buffering the tile data
>> and then writing a a scanline-based image at the end.
>>
>> -Nathan
>>
>>
>>
>>
>> --
>> Magno Borgo
>> www.boundaryvfx.com
>> www.borgo.tv
>> Brasil:Curitiba:GMT= -2 (dst)
>>
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>
>
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