It is my first time using Unreal Engine, I am working on a virtual reality project to create a realistic environment. I have been using the Meganscans’ Black Alder package’s trees to build the scene since it has a really good quality for free.
However, I am facing multiple flickering problems with the tree leaves. Whenever it is in front of (looking from a VR perspective) a white background like VolumetricClouds, skyAtmosphere or similar, the leaves flickers really badly (it also happens with other colored backgrounds, but it is maximized on white backgrounds). Flickering problem in UE5 using Black Alder Megascans trees - YouTube - Notice the edges of the tree/leaves.
The leaves itself also has a weird flickering on the middle whenever the wind is moving the leaves. I believe it’s just something we cannot have much control since it is how the wind physics is making the branches/leaves swing one behind each other. However, if anyone has a better understanding if it is possible to minimize it while still leaving the wind on, please comment below. - YouTube - Notice the annoying flickering on the center of the tree/leaves.
It feels like it is moving unrealistically and ends up causing a bit of dizziness on VR if looking at it for too long.
Just an addition, if anyone has any tips for realistic vegetation (mainly trees) and water system assets, please comment the name so I can take a look at it.
Can OP confirm that changing anti-aliasing fixed this issue? I’m battling the same problem on my end and switching between TAA, TSR and MXAA and FXAA didn’t make a difference. I even tried the Nvidia DLSS plugin to no avail.
The issue is the same as per the video; leaf cards with alpha channels flicker on movement (either from camera movement or from foliage animation) whenever there’s a volumetric cloud directly behind it. The only workaround that worked so far has been to replace the volumetric cloud layer with a skybox, but for my project this isn’t going to cut it.
I also found this thread on Reddit describing the same problem, however their solution was simply to use volumetric clouds from the Dynamic Volumetric Sky pack from the Unreal Marketplace. This doesn’t explain what caused the issue to begin with.
So, for me simply changing the anti-aliasing solved the flickering issues on VR, but it also had other minor visual glitches that I could ignore.
From what I was reading, it is very likely that it is a z-fighting issues. However, I didn’t go further in depth to solve it. If you find anything please let us know.