question

Chinh Cao avatar image
Chinh Cao asked

Problems exporting separate EXRs for AOVs per Light group using aiAOVDriver

Heyy,

I'm having a small little problem regarding the final image exported with custom aiAOVDriver. What I'm trying to achieve is the same as what's described in this thread here: https://answers.arnoldrenderer.com/questions/34256/is-it-possible-to-have-lightgroups-aov-merged-in-d.html.

I've got everything to work mostly. The only problem is EXRs exported with custom drivers don't have a main RGBA channel exported, so it contains all the AOVs in it, but in Nuke the RGB and alpha channel is black/empty. Hopefully the attached screenshot help clarify my problems a bit better.
Thanks for the help guys~!


empty_rgba.png




aiAOVDriver_setup.pngblack_preview_in_windows.pngworking_aov_2.pngworking_aov.png

mtoaaovslight group
aiaovdriver-setup.png (107.7 KiB)
working-aov-2.png (235.2 KiB)
working-aov.png (595.5 KiB)
empty-rgba.png (21.5 KiB)
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Stephen Blair avatar image
Stephen Blair answered

Hard to tell, I think I'd need to see a scene, or at least an Arnold log.

Do you really need the separate EXRs like that? Because it takes a lot of manual set up.

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Chinh Cao avatar image
Chinh Cao answered

Hey Stephen,

Here's the scene that I used. Can't find a way to upload the .ma in here so I have to share through google drive, hopefully that's okay. Just want so more control in comp when it's needed, and I managed to automate the process so it won't be to bad to set up :)

https://drive.google.com/file/d/1KpRoqNjBX5PUGFjbOeZprF741wWIdw_5/view?usp=sharing

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Stephen Blair avatar image
Stephen Blair answered

Hi

The files like blue.exr do not have RGBA channels, that's why you don't see anything. For the beauty RGBA in blue.exr, it's blue_beauty

Here's the channel list for blue.exr (I got this with oiiotool -v --info)

  • blue_beauty.R, blue_beauty.G, blue_beauty.B, blue_beauty.A,
  • blue_coat.R, blue_coat.G, blue_coat.B, blue_coat.A,
  • blue_coat_indirect.R, blue_coat_indirect.G, blue_coat_indirect.B, blue_coat_indirect.A,
  • blue_diffuse.R, blue_diffuse.G, blue_diffuse.B, blue_diffuse.A,
  • blue_diffuse_indirect.R, blue_diffuse_indirect.G, blue_diffuse_indirect.B, blue_diffuse_indirect.A,
  • blue_specular.R, blue_specular.G, blue_specular.B, blue_specular.A,
  • blue_specular_indirect.R, blue_specular_indirect.G, blue_specular_indirect.B, blue_specular_indirect.A
  • blue_subsurface.R, blue_subsurface.G, blue_subsurface.B, blue_subsurface.A,
  • blue_subsurface_indirect.R, blue_subsurface_indirect.G, blue_subsurface_indirect.B, blue_subsurface_indirect.A


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