Hi @flav,
Thanks for sending over the test data. I’m seeing the same visual bugs on my end, too.
I believe this is actually a problem that we previously observed here: Buggy texture coordinate generation for raster overlays · Issue #1564 · CesiumGS/cesium-unreal · GitHub. For context, when we drape raster overlays over 3D Tiles in Unreal, we generate a completely new set of texture coordinates to map the raster. It’s not using the original texture coordinates in the glTF, so that’s why you’re seeing correct UVs in one but different UVs in another. When I wrote that Github issue, I couldn’t confirm whether it was just a problem with the user’s own data. However, the fact that this came up again leads me to believe that there’s something genuinely wrong with how we drape raster overlays at runtime.
I’m going to escalate this as a bug to our team so that one of our members can take a closer look. We’ll update this thread when there’s progress. Thank you again!
Best regards,
Janine