The front glass and back glass are two separate skeletal mesh components.
The artefacts appear on the component that is behind the first component.
I got these glass materials off the marketplace.
This is the material instance:
This is the base material:
Any help solving this please?
PS: The flickering artefact on the seams of the two components are not caused by overlapping faces, there is indeed a gap between them.
BUMP?
Had to resort to ChatGPT for the answer.
Translucency Sort Priority should be changed on one of the Mesh Components in the BP.
Its saddening where we’re headed, but it works. Let’s hope nobody hijacks our reliance on a product rather than each other. This is the ChatGPT answer to this question:
It happens because Translucent materials don’t write to depth.
That means:
No depth buffer write
UE sorts translucency per-object, not per-pixel
Two meshes at similar depth → sort order flips frame to frame
So even with no overlapping faces, the renderer can’t consistently decide:
“Which glass mesh should be drawn first?”
Result: flicker / popping / swapping
Because both meshes:
Use the same glass material
Are close together in depth
Have large or intersecting bounds
UE’s sort key changes slightly with:
Camera movement
TAA jitter
Floating-point precision
So it alternates which one draws on top.
FIX 1 (Most common): Set Translucency Sort PriorityThis is the intended solution.
For the mesh that should render on top:
Mesh Component → Rendering → Translucency Sort Priority