Unreal Engine Issues

UObject properties in OnRep functions can be invalid

The shadow state used to store previous values on the client side is not GC aware, so when an object gets garbage collected it's not nulled out of the shadow state.  This results in stale pointers b ...

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 ...