Unreal Engine Issues

Substrate Adaptive GBuffer: HWRT Hit Lighting drops indirect lighting from lights with a Light Function (GI / Reflections)

The Light Function variant of the hit lighting miss shader is compiled as the Light Function material, so MATERIAL_IS_SUBSTRATE=1. This makes it read the ray hit surface from the payload incorrectly ...

Bug in StringTemplate.cpp related to modulo operator in MaterialTemplate.ush (code fix provided)

Shader Template files like MaterialTemplate.ush do not submit previous chunks when encountering a `%` character, unless that `%` character is `%s` or `% {...} `. Because the error is happening ...

"Fix root motion initial rotation handling" commit breaks root motion completely

Enabling and processing root motion causes animation to rotate the wrong direction. Roll instead of Yaw. Pitch instead of roll etc. This error does not occur in UE 4.6. ...

MRQ render with a slow output format drives Niagara GPU tick flush into its dummy-view path, causing an access violation in SetShaderParameters

Sorry for the AI ticket, but it did a better job than I could: Rendering a level sequence through Movie Render Queue crashes the editor with an EXCEPTION_ACCESS_VIOLATION when the scene contains a N ...

BlendSpace DeltaTimeRecord.Delta can incorrectly be set to zero

It's possible for blendspaces to end up with an invalid delta time record because of how UBlendSpace::TickAssetPlayer modifies the time record.  This only seems to happen with specific settings:Axis ...

Metasounds - Using the Audio Component Play Node with a start timer other than 0 results in the Metasound ceasing to function

Metasounds cease functionality if called to Play with a different start time other than 0. This extends to the Metasound editor where pressing play to preview the sound also ceases to function. ...

Subsurface Profile material in scene capture with r.SubsurfaceScattering set to 0 causes wrong value in alpha channel

[MetaSounds][Trigger Route] - If Value 0 is a non-zero value and Value 1 is a zero value, the output "pops" on triggering Set

When using the Trigger Route node, if Value 0 is a non-zero value and Value 1 is a zero value, the output "pops" on set. [Link Removed] ...

[CrashReport] UE4Editor_PropertyEditor!TSharedPtr<IPropertyUtilities,0>::ToSharedRef() [sharedpointer.h:794]

Top Crash in 4.18 release Comment from User: "Picking a color for my shader" Source Context:// NOTE: The following is an Unreal extension to standard shared_ptr behavior 788 FORCEINLINE ...

Overridden mesh values are lost when upgrading from 5.5.0/5.5.1 to 5.5.2 on blueprint skeletal mesh components

This issue is caused by the backout in 38341618.  The original code that went into 5.0 affects serialization by changing the UCS modified properties.  When upgrading, the override is lost because th ...