Unreal Engine Issues
Unreal Engine Issues
Niagara GPU particles will always have a lifetime of one second if they use a Collision Module
UE - Niagara - May 2, 2019GPU Particles will always have a lifetime of one second when using a collision module. This is a result of an issue with how off screen timing is handled. GPU particles that are off screen should on ...
Multiple Planar Reflections are not captured when forward shading
UE - Graphics Features - Oct 25, 2019After enabling forward shading, having two planar reflections in the scene causes one instance to not render properly. Tested in 4.22.3 (CL - 7053647), 4.23.1 (CL - 9631420), 4.24 (CL - 9828119), 4 ...
Landscape surface type always return "Default"
UE - Simulation - Physics - Dec 26, 2019The behavior in this bug is a little odd since it is not present in any project that is upgraded to 4.24.1 (CL-10757647), but only those that are created directly in 4.24.1. The behavior is also a l ...
Textures become darker on BSPs when converted to a Static Mesh using Baked Lighting
UE - LD & Modeling - Modeling Tools - BSP - Jan 16, 2020A BSP converted to a Static mesh shows a much darker texture material when built with Static/Baked lighting. This was reported and tested in 4.24.1 (CL-10757647). This was reproduced in 4.23.1 (CL ...
Canvas Render Target 2D doesn't get alpha mask when rendering with ES3.1
UE - Platform - Mobile - Apr 23, 2020The Alpha Mask on a Canvas Render Target 2D no longer appears when rendering with ES3.1. This is a regression from 4.24.3 (CL-11590370). This was reported and tested in 4.25 Preview 7 (CL-12759524) ...
Inventor Assembly imports incomplete or missing geometry
UE - Editor - Content Pipeline - Datasmith - Importer - May 22, 2020It seems that UE4 has a problem with importing Inventor Assemblies and Subassemblies. Files are either the wrong orientation or missing their geometry completely. This was reported and tested in 4 ...
Static lighting isn't bouncing when using Layered Materials
UE - Graphics Features - Lumen - Aug 13, 2020Static lighting will not bounce on the ceiling when using a Layered Material. The Material Attributes Layers node is used which doesn't appear in 4.24.3 so this isn't a regression. This was report ...
Absolute World Position post process no longer works in mobile preview
UE - Platform - Mobile - Sep 2, 2020User reports this work correctly in 4.24, but now no longer works as expected in 4.25.I don't have a clear CL just yet, marking unconfirmed. If you change the settings to use ES3.1 Preview and just ...
Niagara Crash : ExportParticleDataToBlueprint module causes buffer overrun
UE - Niagara - Aug 10, 2021This buffer overrun is probably caused by the ExportParticleDataToBlueprint module does not respecting the GPUAllocation Fixed Size setting in the module. In fact, out-of-range export data is not c ...
Atmosphere related scan line artifacts for Path Tracer with MGPU
UE - Graphics Features - Path Tracer - Feb 10, 2023There are two UDNs related to this issue. It makes the Path Tracer unusable with MGPU, with atmosphere enabled. I already have a one-line fix implemented and tested. The atmosphere scan line arti ...