How To : Create Light AOVs (LPEs) using Maya and Nuke

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In this tutorial, we are going to talk about Light Path Expressions (LPEs) which means we output light into specific AOVs. LPEs can be used to extract specific light contributions from Arnold into separate custom AOVs. We also have a look at how they can be recombined in a compositing package.
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00:00 Let's Get Started
00:51 Light Manager
04:10 Light Groups
05:07 Custom AOVs
08:25 Rendering
10:20 Compositing using Foundry Nuke
#sarkamari ‪@Autodesk‬ ‪@sarkamari‬-
- Intro music by ‪@Limujii‬ - Sweet Talks (No Copyright Music) Watch: • Limujii - Sweet Talks ...
Music by: Chill Summer Vlog | No Copyright Music

[@zeze--]

You're an amazing teacher and your videos are an absolute pleasure to watch, thank you for this :)

[@sarkamari]

Your comment really made my day. Thank you Zeze 🤍

[@LynxWatcher]

Thanks! You're an excellent teacher, I never felt that anything was unclear. Would love to see more Nuke / Nuke+Maya videos in the future!!:)

[@sarkamari]

What a positive comment. Thank you, Mathing 🙏🏼💪🏼

[@PeterRobieArt]

Thanks for the video. It's nice to see a simple breakdown like this that gets to the point.

[@InauspiciousGamer]

This was exactly what I needed, thank you so much. The compositor I'm working with will also be thankful lol.

[@sarkamari]

Glad you found this useful

[@SatyamAdhikary]

Finally i found it!! Thank you so much ❤

[@sarkamari]

Haha great

[@sooshiyansjahan4773]

Again, a pleasant surprise, good luck, Master

[@sarkamari]

Thank you. Always kind

[@rishiishan9370]

wonderful explanation clean and clear

[@sarkamari]

Glad you found the video useful

[@roswarmth]

perfect, it was a bit tedious doing this in Ae., thanks 😄

[@sarkamari]

Glad you found the video useful

[@cloudjonny3d]

Thanks! Really helpfull

[@sarkamari]

Glad you found the video useful 😁

[@MayurButiya]

Video is Usefull brother 🤟

I never saw anywhere that you could just create a custom AOV with only the fucking name of the lightGroup and that was all. Where the hell is that in the documentation? I'm using LPEs for that very same thing, but this way is much simpler! Thanks!

[@sarkamari]

Hopefully that was a compliment 😂 Couldn’t tell

@@sarkamariIn fact it was a SUPER DUPER compliment! I mean, how did you find that out? I never saw that in the documentation

[@sarkamari]

​@ Haha, I'm so relieved! You know, I've had this problem before with earlier versions, and I had to find a way around it. Basically, I was so desperate to fix it that I stumbled upon a solution, and I figured I should share it with everyone else who might be dealing with the same thing.

@@sarkamariI'm glad you did, I was in your very same situation and thank God I found your video :)

[@yusuke28]

Is there a way to render only light while it is interacting with the object but the object should be invisible like only light pass no object

[@wordsshackles441]

Any chance you know how to output a mask as an AOV for a specific object ?

[@kruz3d573]

Add AiFlat Node from the Arnold Shaders. (Select an absolute white color for the flat color. And that will be your Mask for the Object)