topic Re: Mental Ray EXR Render Passes Come Out Black in Maya Shading, Lighting and Rendering Forum

Mental Ray EXR Render Passes Come Out Black

Anonymous — Wed, 12 Jul 2017 13:23:23 GMT

I'm trying to render out some passes via mental ray to an OpenEXR file. Tried both 16/32 bit and a lot of other combinations and still all my passes come out black. The only time I got a non black result was when I applied the Lambert material and was able to see the diffuse channel (but all other passes were still black). Otherwise I was using mental ray materials.

Attempting to use mental ray to render out an EXR file for multi-pass compositing in NUKE, any help would be appreciated!

Re: Mental Ray EXR Render Passes Come Out Black

mspeer — Wed, 12 Jul 2017 15:38:56 GMT

Hi!

More Info please, Maya Version, Mental Ray Version, Materials, how do you setup/render passes...

Re: Mental Ray EXR Render Passes Come Out Black

Anonymous — Thu, 13 Jul 2017 14:42:36 GMT

Sure thing:

Maya 2016

Mental Ray for Maya 2016 (I think, not sure how find that out)

Using all mia_material_x with a physical sun and sky

Have tried to set up the passes by using the passes tab in the render settings as well as using the passes menu under the scenes tab.

Let me know if there's any other info I can provide.

Re: Mental Ray EXR Render Passes Come Out Black

mspeer — Thu, 13 Jul 2017 17:31:26 GMT

Hi!

The passes in Maya 2016 are for the "new" Mila Material that's why it's called Mila Light Path.

There are however some Standard Utility Passes at the lower bottom that will work with other Materials too.

You could try using Render Layers to get the expected result with Mia Material but using Mila Material should be way faster and easier.

Re: Mental Ray EXR Render Passes Come Out Black

Anonymous — Thu, 13 Jul 2017 18:23:32 GMT

Ahh cool. Yeah now I'm seeing the passes come through! Thanks for that tip. I suppose I can research this but why is there no shadow pass (and some other common passes) in the Passes menu?

Thanks again!

Re: Mental Ray EXR Render Passes Come Out Black

mspeer — Thu, 13 Jul 2017 19:10:23 GMT

Hi!

"why is there no shadow pass (and some other common passes) in the Passes menu?"

Better to ask NVIDIA...

...,but maybe because these are Material/Light Passes.

For other passes not available in the Passes tab, Render Layers would be the better choice.

Re: Mental Ray EXR Render Passes Come Out Black

Anonymous — Thu, 13 Jul 2017 19:21:04 GMT

Haha got it. Thanks!