Unreal Engine Issues

Lighting Channels Do Not Function with 78+ Lights on Actor

Lighting channels do not function when the number of lights affecting actors is 79 or higher. Any number of lights that is 78 or fewer will honor lighting channel assignments. ...

Volumetric Render Target Mode 2 is blending past frames.

Volumetric Render Target Mode 2 is blending past frames in Time of day map with the volumetric clouds.  This is a regression due to it not happening in 4.27 ...

DefaultEngine.ini restored after deleting does not match the originally generated DefautlEngine.ini

Regenerated DefaultEngine.ini should regenerate with D3D12 RHI not D3D11 RHI which would match the original generation of the file. 4.27 is  generated with D3D11 and regenerated with D3D12.  ...

Crash when changing details of an animation in an Animation Composite

This is a regression tested in //UE4/Release-4.27 CL#18319896 Fatal error is thrown and the Editor crashes when changing details of an animation in an Animation Composite. ...

Movie Render Queue Deferred Lighting(Detail Lighting) only outputs Lighting Only

This is not a regression. Tested in //UE4/Release-4.27 CL#18319896 Movie Render Queue Deferred Lighting(Detail Lighting) appears to only output Lighting Only.  ...

Returning the value of a Transform as a String has a missing colon after Scale

This is NOT a regression. Tested In //UE4/Release-4.27 at CL18319896 Printing an actor's transform as a string returns transform and rotation with a colon, but returns scale without. ...

NPC - Texture Sample DI does not work on Niagara Parameter Collections

Texture sample DIs no longer work when used with Niagara Parameter Collections. This seems to affect Volume Texture DIs based on customer reports, but I have not confirmed this.  ...

Crash when importing Alembic data with a large number of vertices if Merge Meshes is enabled.

NavMesh does not build correctly to SkeletalMesh collision

NevMesh cuts out holes for collision incorrectly with Skeletal Meshes. Skeletal Meshes with "Can Ever Affect Navigation" set to true and that have a Physics Asset are capable of causing this. ...

Reduced Tessellation at edge when using world displacement

Adding a material to a mesh that is affected by world position offset has reduced tessellation around the meshes edges. This is seen when viewed in wireframe and is influenced based off of the angle ...