Rendering cinematics with 5.8 I’m getting some really irritating artifacts. They don’t appear in the editor, only in rendered frames.
These purple streaks show up on many frames, as well as sometimes some really hot “spots” (like you can kinda see next to the thumb).
I’ve tried about every possible render setting and cvar I can think of. I’ve tried adjusting all the transparency settings in every way. Tried every AA setting.
It SEEMS like it’s related to the skin material (an altered Metahuman Shader) because if I set the character’s body material to default grid, those artifacts don’t show up.
More specifically, it seems like it’s related to it being a Subsurface Profile shader, maybe - if I change the Shading Model to “Default Lit” or even to Subsurface (not SSP) I do not seem to have this issue.
Adding a render CVAR r.SSS.Scale 0 eliminates the artifacts. Setting it to 1 or 2 brings the artifacts back.
The specific Profile is set to the SSP Unified one that comes with metahumans and I haven’t messed with it. Setting the profile asset to None, or creating a new one doesn’t resolve the issue.
I thought Lumen GI was part of the problem but setting GI to none doesn’t fix it (sometimes it actually seems to make more streaks)
r.SSS.Burley.Quality 0 does not resolve the issue. r.SSS.Burley.EnableProfileIdCache 0 doesn’t resolve the issue.
I tried creating a new material with the same settings, but simplified. No change, it still has the same issues with artifacts.
I mean, I can come up with an alternate way to render the characters rather than use the SSP and will probably do that, but I’m just wondering if anyone has found an issue for this. Also regular Subsurface means I’d not be able to directly mask out parts of the body (like under clothes).
HELP?