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CG Compositing Series - 4.1 LightGroup / AOV Paradox

In this final installment of the CG Compositing Series, we focus on using LightGroups and Material AOVs together in a single workflow, and the paradox that come with it. Why do these 2 rebuild methods seem to clash? This video explores: The complications of splitting LightGroups per Material AOV A method for transferring changes between setups using a Difference Map The pitfalls of using Subtraction and the advantages of using Division A comparison of math operations: Add/Subtract vs Multiply/Divide A stress test of the Division-based setup Template layout strategies and rules to keep your rebuilds stable Carrying changes across the template from the 1st rebuild to the passes of the 2nd for the most interactive user experience. The video wraps with ideas and techniques you can apply in your own CG Templates. If I could ask one small favor from you, it would be to help share this video, or the blog post, to compositing or VFX friends and colleagues. Whether it's in a group chat, work chat, discord, linkedin post, I believe this knowledge is too important to keep secret. I would love to see this amazing workflow become more commonplace in the world of Compositing. Thank you. For a full blog post write up, images, and downloads, please visit the post on my CompositingMentor blog: https://compositingmentor.com/2025/05... You can find links to the MergeDivide.nk along with the junkyard renders, and demo nuke scripts at the bottom of the blog post. Timestamps: 00:00:00 - Intro 00:00:53 - What is the LightGroup/AOV Paradox? 00:06:12 - Splitting AOVs per LightGroup 00:09:09 - Problems with Splitting Workflow 00:18:21 - Transfer Changes Workflow 00:20:11 - Subtractive (Absolute) Difference 00:26:06 - Subtractive Difference Problem 00:32:08 - Division (Relative) Difference 00:39:55 - Stress Testing Division Difference 00:43:50 - Workflow Tips 00:45:27 - Posssible Rebuild Layouts 00:47:45 - Carry Changes throughout Template 00:52:10 - Rules and Caveats 00:56:41 - Provided Example Templates 00:57:31 - Template Ideas and Inspiration 01:00:25 - Outro A huge shout out to Ernest Dios for being one of the true masterminds behind this amazing technique. Also a big thank you to Alexey Kuchinski for all of his mentorship.

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