[UE-230171] Vertex color issues, some more info.

Kotlet
Tue, 28 Jan 2025 20:14:04 +0000
Issues and Bug Reporting

Summary

So I noticed there is already bug submission about incorrect vertex colors. UE-230171 to be precise. I just wanted to add also that I noticed when using Vertex Color node in material editor RGB vs RGBA vs separate channel outputs give different results. RGB>mask G will give different result than straight G output. When using RGBA > mask G bottom half of my baked edge data (dents) (0-.5) does not work while (.5 - 1) works fine. So entire thing is all over the place. I am talking about baked vertex colors using modeling baker in UE. I initially thoght its just linear vs srgb but the difference between rgb vs rgba make it seem like there is more to it.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

UI/Tools

Steps to Reproduce

1. Bake AO>R and Edge >G using Bake Vertex Colors in Modeling. Build pretty nodes like I did.

2. Compare RGB vs RGBA. Also compare single channel outputs vs component mask from RGB.

3. Additionaly (and it might be indended) but I get different results when you swap order of sRGBToLinear with mask component node.

Expected Result

For results to be uniform from all outputs.

Observed Result

Different combinations of direct outputs, component masks or order of srgb>mask node give different results.

Platform(s)

Win 10

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2 posts - 2 participants