Hey all, I hope everyone is doing well.
I just started using UE5 for cinematic previz and I’m having fun learning.
I’ve run into an issue and I hope someone can help.
I have a scene setup with multiple cameras (Some Meta Humans at a diner)
Every time I do a camera cut, the MH hair blows around. I have no idea what’s happening.
It makes me think the camera is Jumping position and the force is somehow effecting their hair, IDK. Even stranger, It only seems to happen when I render and it’s never consistent.
Hey there @urbanrevolution and @ORTyOW! Welcome to the community! You finished your post before I got to mention it, but this is because each new camera cut is spinning down the render and starting it again, so all physics based things that need to settle like hair effects will always want some warmup frames to avoid flaring. Great work!
yes, I tried that all, also seeked through every topic related to this, and it seems like people are still having the same problem and it is not fixed yet. I’ve found this solution:
“By the way… I found a WORKING solution !
Go to the Hair Physics in your groom
In the solver choose “custom” the re-choose the correct solver exemple:spring
Then rendering with AA works !! (5.1 or 5.2)”
but didn’t try it yet, will try soon
Ahhh so it might be a solver issue more than just the warmup issue! Excellent work! I was spinning up a Metahumans hair test scene to play with it just in case so that helps immensely! Once you test with all your shots and it works, let me know and we can get a report submitted for that issue.
Thank you! Actually before trying hair physics change, I found out that there is no problem when I render a fragment of one camera within the camera cut, and the hair only gets buggy when transition between cameras is happening, although nothing happens to the character at the moment of transition, the camera just changes.
camera cut warm up doesn’t help either.
First sequence is a Camera Cut with 2 cameras in a row
Second is just a single camera render Uploading: 1.31seq.mov… Uploading: 1.32seq.mov…
So I guess the workaround solution is to render each camera separately. I hope this will be fixed in the future.
If that didn’t help for others, you should try something from these options:
Turn off Hair physics if you don’t actually need it and just need static hair
Try disabling Motion blur, I know cases when this helped with Cloth and Hair simulation. If you need Motion blur you can add it later in the post production in Davinci/After/Premier etc.
Try adding Engine Warm Up Count or Enabling “Render Warm Up Frames” inside Anti-aliasing settings in Movie Render Queue. Also try high Warm Up numbers like 300-600
Try Disabling/Enabling Override AA checkbox, have multiple cases it helped when Disabled
Try not using Anti-aliasing at all, see if it works without it - not the best workaround, but if having AA isn’t crucial for you, you can get rid of it if it is helping
Try “Go to the Hair Physics in your groom. In the solver choose “custom” the re-choose the correct solver example:spring”
This can be changed to a solution. It is not ideal, but looks like it is the only way around.
Good workaround at least. I can point other users to this in case their cuts are ignoring the startup frames as well, though that setting was intended to correct that so I’ll be writing the report up now. Thanks!
When attempting to upload the video, did it’s little bar come up with a percentage? It sometimes takes a second to process but then starts moving. Submitting before that completes usually leaves the notes as above. If it never started moving that’s a bit odd.
about video, the percentage went to 100% and it got stuck at “Uploading…” I waited several minutes also tried refreshing the page, tried multiple times but it didn’t help
