Unreal Engine Issues
Unreal Engine Issues
Rect light artifacts from NaN pixels on surfaces that are coplanar with light position
UE - Graphics Features - May 10, 2024Rect lights cause artifacts (nan pixels) on pixels of surfaces that are coplanar with light position. In RectLight.ush, in RectIrradianceLambert, at line 106, c30 is -1, so rsqrt(0) causes a nan to ...
Crash playing a HapticFeedbackEffect_Soundwave with no sound assigned
UE - Platform - XR - Sep 13, 2016Crash attempting to use a HapticFeedbackEffect_SoundWave with no sound set on it (i.e. a newly created one.) Found on: 4.13.1 Binary CL-3120228 //UE4/Release-4.13 CL-3123398 Similar to [Link Remo ...
Inconsistance Line Trace behavior
UE - Simulation - Physics - Dec 22, 2016Line trace component appears to return a hit result even when the trace should not have had anything to hit. Attached project shows line trace start & end points. Even when the trace doesn't overla ...
Engine crash from opening level bounds blueprint after project reopens
UE - Gameplay - Blueprint - Jun 2, 2017There is a crash that is occurring when a blueprint with the parent of "Level Bounds". The crash occurs when the project is closed and reopened. Opening the blueprint immediately after it was create ...
Changing LODBias on landscape sections causes grass type placement issues
UE - LD & Modeling - Terrain - Landscape - Jun 6, 2018Changing LODBias on landscape sections causes a grass type placement issues. The grass will be floating and rotated incorrectly. Found in 4.18 CL# 3832480, 4.19 CL# 4033788, 4.20 Preview 1 CL# 4 ...
Enabling Skeletal Mesh 'Per Poly Collision' crashes the Editor
UE - Simulation - Physics - Aug 20, 2018When a Skeletal Mesh isn't assigned, enabling Per Poly Collision on the Skeletal Mesh Component causes the Editor to crash. This issue was reported and tested in 4.20.1 (CL-4233996). This issue was ...
Sequencer 3D Trajectories run very slow on deep hierarchies
UE - Anim - Sequencer - Aug 27, 2018Using a Level Sequence with deep hierarchies causes the FPS to drop to low numbers when they are all selected within the Sequence. This is a regression from 4.19.2 (CL-4033788). This issue was repo ...
If use with mesh particles or use with niagara mesh particles is checked in the Usage flag of the material and the material domain is set to volume, compile error will occur.
UE - Niagara - Jan 5, 2021[SM5] /Engine/Private/VolumetricCloud.usf(118,33-53): error X3018: invalid subscript 'VertexId' This is happening in VolumetricCloud.usf, but it seems that I can avoid the error by adding the follow ...
SKP import - Mirrored groups will display with the default material in Keep Hierarchy imports
TM - Interoperability - Apr 10, 2025Reported in SF [Link Removed] SketchUp models containing grouped elements that are mirrored will incorrectly display these elements with the default material when imported using the Keep Hierarchy ...
AutoReimport can kick in too early for files that are being written out continuously
UE - Editor - Content Pipeline - Import and Export - Apr 2, 2015When exporting a large file, due to the way the auto reimporter only checks for the number of changed files has remained stable for some given threshold, it can kick in too early even though the sin ...