Flickering on Plants

Development Rendering
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1

hello. I am facing a big problem right now.
I created a level in Unreal Engine, and rendered it with Movie Render Queue. But my trees and plants are showing this happens.
Is this called flickering and how did people who have this problem solve it? I need help. It only happens to trees.

These plants are nanait and the same thing happens when nanait is turned off.

20240229

The gif image below is an image rendered by the movie render queue.

2

raytraced shadows do not support wpo deformed geometry. that’s what it looks like.

3

Hi. Thanks for your reply. Unfortunately, I have the same problem even if I turn off WPO, change the material and don’t use post processing, or turn off the raytraced shadow setting. I somehow managed to get rid of the green tree, but it keeps happening to the pink tree. I’m glad to know that raytraced shadow is not useful for WPO thanks to you though, because I’ve learned that it’s not a good idea to use it for WPO

Translated with DeepL.com (free version)

4

I do have a similar problem with flickering foliage when using MRQ but only if I use the Anti Aliasing Option. Would be very thankful if anybody knows what causes these issues and how to fix them.

5

hi. I tested it today and it’s an AA issue as you said. I haven’t found a solution for this yet lol.

1 Like
6

Hey! Not entirely sure about the fix, but here are a few things you could try:

  1. Give this a shot: r.Raytracing.shadows.enabletwosidedGeometry 0. Even though it doesn’t seem like it from your gif.
  2. Make a backup and start messing with the material setup/settings. Turn off the wind, tweak things around – sometimes it magically sorts stuff out, or at least points you in the right direction.
  3. Disable/enable anything related to lights, shadows, and related elements.
  4. Drop that tree into a blank project and see what’s happening.
  5. If movement isn’t crucial, export it as a mesh, then reimport it back into UE. Try to merge, cut all primitive stuff.
  6. If all else fails, consider changing trees. Sometimes, when time’s ticking, finding a workaround is the way to go.
  7. Last one form me: Get rid of the leaves parts and replace it with others that work (from Quixel for example). Good luck! :slightly_smiling_face:
1 Like
7

Hi, I will try to execute everything you said, thanks ><