Unreal Engine Issues

Volumetric Clouds do not affect Niagara particles or Translucent materials

RayTracing Final Gather is not working in UE 5.1

Further Comments: Customer is using the deprecated ray traced mode. ...

DrawDebug elements on screen affect aspect ratio letterboxing

During gameplay when the view target camera's aspect ratio is not exactly the viewport's aspect ratio, the presence of rendered debug draw elements (DrawDebugArrow, etc) makes the viewport's rendere ...

Copy Actors out of play mode ( 5.3.1 )

From UDN case #00645621: Is it possible that this function has been deactivated? In 5.03 I can copy objects from the game mode. ...

Split Struct Pin on a Function output will return a compiler error

Split Struct Pin on a Function output will return a compiler error: Error Pin New Param 1 X named NewParam1_X doesn't match any parameters of function NewFunction_0 Error Pin New Param 1 Z name ...

Incorrect shading for SubSurface profile in the Blueprint Viewport.

The Subsurface shading looks incorrect in the Blueprint Viewport window. Adjusting the cvar for r.sss.checkerboard from the default value of 2 to 1 looks more correct and a value of 0 switches back ...

Major performance drop with instanced meshes since PhysX 3.4 upgrade

Major performance drop with instanced meshes since PhysX 3.4 upgrade Regression: YES Worked: 3172292 (4.13.2) Broken: 3249277 (4.14.3) For me, my results were: 4.8 through 4.13 No Collision - ...

Editor Crashes when importing some FBXs with multiple Material IDs in 4.14.2

This is a regression in behavior between 4.14.1 and 4.14.2! The editor will crash when importing FBX meshes that have multiple material ID assignments. If it's a single material ID it will import w ...

Particles Do Not Obey Lighting Channels

Particle systems ignore lighting channels - no matter what channel a light is on (even if no channels are selected), it will affect lit particles. Changing lighting channels on the particle itself h ...

Float Curve evaluation may yield completely wrong results due to floating-point precision issue

Note: This is possibly related to [Link Removed]. For some inputs, function UE::Curves::WeightedEvalForTwoKeys() inside file "CurveEvaluation.cpp" can incorrectly return the value of the first key, ...