[Sidefx-houdini-list] Mantra with deep EXR for holdout (from other renderers)

[Halfdan Ingvarsson]

Hello Kiyoshi-san

mantra (and Houdini, by extension) writes out deep OpenEXR images using 
the standard OpenEXR naming convention for the opacity and depth 
channels (i.e. RA/GA/BA and Z, respectively).

The one difference is that we don't write out a ZBack, but then again, 
we don't interpret it either. This is on our TODO list, since it makes 
hard to distinguish between volumes and hard surfaces.

However, it's difficult for me to know whether VRay and 3Delight are 
writing out images we can't read, or we're not reading the images 
properly. In my tests, I generated a deep EXR holdout images in Nuke, 
which worked well.

Do you mind logging a bug with support, including a sample scene and the 
relevant images generated by the two renderers? I'll have a look as soon 
as I can.

All the best,

  - ½

On 13-11-22 01:24 PM, KIYOSHI ABE wrote:
> Hi All,
>
> I have a problem with mantra rendering with deep EXR images which were
> generated with other renderers for holdout(Houdini 13 on Linux).
>
> Using RAT or deep EXR rendered with "Deep Resolver" : "Deep Camera Map" on
> mantra ROP can render images with holdout which I want. I set "Background
> Images" on View tab in mantra node to these deep images and turned on
> "Background Images as Matte".
>
>
> Instead of mantra generated deep images, I tried to use Open EXR deep
> images from VRay and 3delight for the holdout. However mantra didn't seem
> to recognise  them and rendered images "without" holdout.
>
> These images with other renderers have different name channels. I suspected
>   this naming issue caused that mantra wasn't able to render with holdout.
> So I tried to rename channel names with COP. But COP didn't deal with deep
> images, Nuke 7 can not rename channels either. (Nuke7, I couldn't find
> "shuffle" for deep images. )
>
> Have anyone had same issue and sorted? Or is there any other reason for
> this?
>
> Kind Regards,
> Kiyoshi
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