Arnold RGB or object ID mattes

[Steve Davy]

We are doing some experimentation with Arnold to see if it's a viable alternative to Vray.

One thing I'm noticing is that while the "matte" attribute on materials is a nice, simple feature that would be great for some circumstances, Arnold does not seem to have anything like Vray's multimatte system that can output RGB mattes during a single render pass. Am I missing something?

It looks like it's necessary to do a second render pass with "matte" checked on each shader you want a matte for, and as many render layers as are needed to get a matte for everything in the scene (each a render layer for every three discrete objects)?

Also, I'm noticing that the Arnold render view does not update matter color or opacity changes properly. Anyone else seen this?

[Kiryha Krysko]

You can output object and shader IDs(mattes) with single render in addition to the beauty into single exr file.

You can use scripts to create IDs automatically (see the IDs tutorials to learn how it works)

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[matt estela]

Cryptomattes! CRYPTOMATTES!!

https://vimeo.com/136954966

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[Steve Davy]

Ha. That looks amazing although probably beyond what we need here.

Looks like it's a bit more laborious to set up RGB mattes by hand in Arnold than it is in Vray....

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of matt estela <ma...@tokeru.com>
Sent: Monday, April 17, 2017 4:36 PM
To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Arnold RGB or object ID mattes

 

Cryptomattes! CRYPTOMATTES!!

https://vimeo.com/136954966

Cryptomatte vimeo.com This is "Cryptomatte" by Psyop on Vimeo, the home for high quality videos and the people who love them.

[Steve Davy]

Is it necessary to go into each AOV node individually to enable and disable on a per render layer basis??

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of Kiryha Krysko <kir...@gmail.com>
Sent: Monday, April 17, 2017 3:47 PM

To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Arnold RGB or object ID mattes

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[Phinnaeus OConnor]

Yeah Cryptomattes are awesome and they come included with Anders Langlands brilliant AlShaders - a robust and fast suite of production proven shaders which are quite honestly is all you need for rendering in Arnold.!

alShaders

alShaders

Enjoy

 

https://phinnaeus.wixsite.com/phino

www.linkedin.com/in/phinnaeus

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From: Steve Davy <stevi...@hotmail.com>
To: "maya...@googlegroups.com" <maya...@googlegroups.com>
Sent: Tuesday, 18 April 2017, 10:11

[sid]

Yes. Cryptomatte.

Failing that, the alShaders also have built in IDs which you can render as an AOV with your beauty.

http://www.anderslanglands.com/alshaders/alSurface.html#IDs

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[Steve Davy]

Has anyone downloaded and rendered the cryptomatte tutorial scene file successfully?

http://www.anderslanglands.com/alshaders/tut_cryptomatte.html

I can download and open the provided scene, but the Buddhas are all just cuboid and don't render at all -- I just get a gray sphere with nothing on it.

So far as I can tell I have the AL shaders properly installed. I'm on Maya 2017.

Using Cryptomatte - alShaders www.anderslanglands.com Maya Project Download the Maya project for this tutorial that includes the scene file.

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of sid <sur...@gmail.com>
Sent: Tuesday, April 18, 2017 2:05 AM

To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Arnold RGB or object ID mattes

Yes. Cryptomatte.

Failing that, the alShaders also have built in IDs which you can render as an AOV with your beauty.

http://www.anderslanglands.com/alshaders/alSurface.html#IDs

alSurface Reference Guide - anderslanglands.com www.anderslanglands.com The backlight layer represents light that is diffusely transmitted from the reverse side of the object and it useful as a cheap subsurface effect for thin ojects such ...

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[Keith Rogers]

As a side note I've been using the ALShaders with VRay in maya 2016. We can't have Arnold where I am so it's nice to get a little bit of it in at least. It is a really nice shader. 

On Tuesday, 18 April 2017 01:37:24 UTC+1, Steve Davy wrote:

Is it necessary to go into each AOV node individually to enable and disable on a per render layer basis??

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of Kiryha Krysko <kir...@gmail.com>
Sent: Monday, April 17, 2017 3:47 PM
To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Arnold RGB or object ID mattes

 

You can output object and shader IDs(mattes) with single render in addition to the beauty into single exr file.

You can use scripts to create IDs automatically (see the IDs tutorials to learn how it works)

On Mon, Apr 17, 2017 at 6:33 PM, Steve Davy <stevi...@hotmail.com> wrote:

We are doing some experimentation with Arnold to see if it's a viable alternative to Vray.

One thing I'm noticing is that while the "matte" attribute on materials is a nice, simple feature that would be great for some circumstances, Arnold does not seem to have anything like Vray's multimatte system that can output RGB mattes during a single render pass. Am I missing something?

It looks like it's necessary to do a second render pass with "matte" checked on each shader you want a matte for, and as many render layers as are needed to get a matte for everything in the scene (each a render layer for every three discrete objects)?

Also, I'm noticing that the Arnold render view does not update matter color or opacity changes properly. Anyone else seen this?

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[Steve Davy]

Wha?

Vray supports Arnold shaders??

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of Keith Rogers <keithrog...@gmail.com>
Sent: Wednesday, April 19, 2017 3:06 AM
To: maya_he3d
Cc: stevi...@hotmail.com

[Gary Jaeger]

it’s the implementation of the AL shader

https://docs.chaosgroup.com/display/VRAY3MAYA/alSurface+Shader+%7C+VRayAlSurface

Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile

http://corestudio.com

[Steve Davy]

We just tested this -- it's pretty amazing actually. Anyone know if there's any plan to push this to other renderers..... like Vray?

Is this becoming industry standard? If not, why not??!

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of matt estela <ma...@tokeru.com>
Sent: Monday, April 17, 2017 4:36 PM

To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Arnold RGB or object ID mattes

Cryptomattes! CRYPTOMATTES!!

https://vimeo.com/136954966

Cryptomatte vimeo.com This is "Cryptomatte" by Psyop on Vimeo, the home for high quality videos and the people who love them.

[matt estela]

Really good question!

We're not using it here cos we have our own renderer, but for some reason our developers are super reluctant to have a look at implementing it (and to be fair they have a lot of other things on their plates).

For everyone else... I dunno, maybe because it almost seems too good to be true? I've never actually played with it, good to hear that your first impressions are as good as I hoped it'd be. :)

-matt

[Phinnaeus OConnor]

Yes, they are digging the Anders at chaos too now:

https://labs.chaosgroup.com/index.php/rendering-rd/v-rays-implementation-of-the-anders-langlands-alsurface-shader/

I think they were used at MPC on Junglebook and now he is at Weta. Go figure. 

Coincidentally, Just about to use them on a job with Yeti, actually looking forward to it! What's wrong with me??

Be great if you could get them in Arnold to Houdini...

P 
Sent from my iPhone

[Steve Davy]

So far as I can tell though this is an implementation of his skin shader only.

The Cryptomatte system is part of the whole render pass/AOV setup within Arnold, so presumably a lot more complex.

Vray's multimatte system is great, but this ability to create mattes for everything and anything on the fly is just incredible.

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From: 'Phinnaeus OConnor' via maya_he3d <maya...@googlegroups.com>
Sent: Wednesday, April 19, 2017 5:30 PM

To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Arnold RGB or object ID mattes

Yes, they are digging the Anders at chaos too now:

https://labs.chaosgroup.com/index.php/rendering-rd/v-rays-implementation-of-the-anders-langlands-alsurface-shader/

V-Ray’s implementation of the Anders Langlands’ alSurface ... labs.chaosgroup.com History of the al Surface shader. The “al” in from the alShaders refers to Anders Langlands, a VFX sequence supervisor currently at Weta Digital, who wrote a ...