Unreal Engine Issues

FileSystemDerivedDataBackend may output a corrupted access log

This problem is caused by the AccessLogWriter has not been flushed at the termination. The following workaround flushes the Writer.class FFileSystemDerivedDataBackend : public FDerivedDataBackendInt ...

Stacked shots will evaluate both sub sequences instead of just the topmost

Overlapping shots will evaluate all shots instead of the topmost one. ...

StaticMesh - CustomDepth breaks occlusion culling without custom depth enabled

Spline mesh can not cast shadow when raytracing enabled.

Handheld AR: Session fails to Start after minimizing/backgrounding the application

When the user minimizes or backgrounds an AR application, and re-opens it, new AR sessions will fail to start ...

[Feature Request] Support force feedback on iOS and tvOS Gamepads

Unreal Engine should support haptics on gamepads on iOS and tvOS [Link Removed] [Link Removed]  ...

Editor becomes unresponsive for long periods between edits of a user-defined enum type when it's referenced by one or more user-defined struct types.

After adding a member to a user-defined struct type and changing the member type to a user-defined enumeration, repeated edits to that enumeration will eventually cause the editor to become increasi ...

VolumetricLightmap doesn't work when shifting a level by world origin rebasing

VLM is not handled when rebasing. The following workaround works. void SetupPrecomputedVolumetricLightmapUniformBufferParameters(const FScene* Scene, FEngineShowFlags EngineShowFlags, FViewUniform ...

InstancedStaticMesh displaying corrupt lightmap data

I think I narrowed this issue down to bad UV coordinates being interpreted during the BasePassVertexShader execution applied to instancing. At this line in VertexFactoryGetInterpolantsVSToPS: flo ...

Sorting objects at EndLoad has a non-deterministic behavior

This non-deterministic behavior is caused by sorting by program address. ...