Compositing 3D Renders in After Effects – Edge transparency issues

Question

Hi everyone,I’m working on a 3D animation in Blender and using After Effects for compositing. My workflow involves rendering different scene elements as separate layers and then recombining them in After Effects. However, I’ve encountered an issue where a very faint outline appears at the edges of the layers when composited. It’s an area of transparency about 1-2 pixels thick.This may not be a Blender-specific issue, as it seems to be related to how holdout mattes generally work. I also discussed this on the Blender forums (link to discussion). Additionally, it’s not as simple as switching the alphas to premultiplied, as doing so results in a severely distorted alpha.Has anyone experienced this before, and is there a way to fix it inside After Effects? Any suggestions would be greatly appreciated!

nishu_kush · Answer

Thanks for reaching out, lucash81190098.

I understand you're experiencing issues while compositing 3D renders in After Effects. Here are a few questions to help us better understand the problem and provide more accurate solutions:

What format are you exporting from Blender? Do you mind sharing a sample file to test on my end?
Are there any specific settings or effects applied to the layers that might be causing the issue?
Have you encountered similar issues with other projects or is this specific to the current one?

Looking forward to your response!

Thanks,
Nishu

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