Unreal Engine Issues

Open Formats: Interchange Import - UCX Convex Hull Import Bug

When importing custom UCX collision meshes from FBX files into Unreal Engine, certain geometry profiles fail to generate correctly if the option "One Convex Hull Per UCX" is unchecked. The engine's ...

Lumen lighting in Presentations may appear darker than in Viewport

Reported in SF [Link Removed] In some scenes with Lumen enabled, interior scene lighting without direct lighting can appear drastically darker in Cloud Presentations than they do in the editor view ...

StreamingGeneration: Actor desc mutator phase now writes ActorDescView directly, breaking the cluster-invariant check in ValidateContainerInstanceDescriptors

This report is from an EPS case: We hit a regression upgrading our project from 5.7 to 5.8. Map Check (and any other path that ends up calling UWorldPartition::CheckForErrors) assert inside FWorld ...

MRG - Potential issue with graphs being duplicated in game builds

Audi has [Link Removed] saying they cannot duplicate graphs in a game build. They are off launcher, not a custom build. Slack thread [Link Removed] ________________________________________________ ...

Crash with SceneCapture DepthPrepassOptimization enabled

Functions referenced via a Property Access node don't appear in blueprint Find By Class Member results

Finding Reference By Class Member fails to find references to bp functions from property access nodes. ...

Property Access nodes fail to display variable data in SM transition tooltips

The data shown in the transition tooltip is generated via SKismetLinearExpression::MakeNodeWidget. The issue is that while UK2Node_VariableGet have specific functionality to display the variables a ...

Non-determinism in StaticMeshComponent::BodyInstance when cooking LevelInstances

A licensee reported that serialization of LevelSequence with StaticMeshActor with default collision for which mesh has NoCollision profile is not deterministic. The issue seems to be in the fact tha ...

Non-determinism when cooking a UProceduralMeshComponent

We received a report from a licensee that UProceduralMeshComponent cook is not deterministic. This is related to the ProcMeshBodySetup member and the fact the UProceduralMeshComponent code changes t ...

FNiagaraRendererMeshes::GetDynamicRayTracingInstances(...) corrupting GPUScene when rendering multiple views

When rendering a game in splitscreen using Lumen HWRT, Nanite and a large number of Niagara Mesh Particles 1mil+, various meshes and actors will stop rendering. Setting r.RayTracing.Geometry.Niagar ...