Unreal Engine Issues and Bug Tracker (UE-131461)

Description

I test it for more information for your reference:

It happens only when a Landscape *Height *was output to the RVT, other Landscape's maps like BaseColor are all fine, as well as Height output from other geometry like Staticmesh are all fine
It happens when the RVT volume was put in a Streaming level
It happens when using World Composition way to stream the level, it doesn't happen when using a regular Blueprint way
It only happens when the RVT is visible at first place when it's get streamed. Meaning if it's streamed behind the camera it has no problem. you can rotate the Playstart actor 180 degree play again to verify it.
Flush RVT cache using r.VT.Flush can fix the issue in runtime
If the RVT Volume was Put in the Persistent Level, the issue wouldn't happen

Steps to Reproduce

Open the Persistent Level in the attached Project(RVT_Issue) and Play
After running, the World Composition logic streamed in the sub level which includes RVT Volume, the Landscape outputting Height to RVT and a Plane mesh sampling the RVT.
The RVT caches Landscape's World Height then got sampled and fed into the Plane's material Emissive Color for Debug purpose
You can see pixelized RVT output from a landscape World Height; It looks like very low res RVT mip was loaded and can't be updated correctly while camera is moving

Community References

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-131461 in the post.

5	Login to Vote

Unresolved

Created	Oct 13, 2021
Updated	Sep 5, 2024

RVT output from Landscape Height gets incorrect mip cache loaded