Unreal Engine Issues
Unreal Engine Issues
Missing materials on the rear lights and windows of library vehicles
TM - Content - Oct 24, 2025Reported in SF [Link Removed] The rear light material and window materials on Twinmotion library vehicles are not present on many vehicles in TM 2025.2. Confirmed affected vehicles are in the foll ...
Cooked content results in crash on launch of QAGame.exe
UE - Graphics Features - Feb 22, 2019Seems to be an issue with how the cooker is calling the contents of TM-ShaderModels. ...
Collision for bsp stays in level after bsp is deleted
UE - LD & Modeling - Modeling Tools - BSP - Jun 30, 2015If a bsp brush is deleted from a level, the level has geometry built, and the user presses play then uses the "show collision" console command, the collision for the bsp wlil still appear. This does ...
User cannot undo the automatic changing of Mobility settings
Tools - Sep 12, 2016When the users causes a component to automatically change its Mobility setting by changing that setting on a parent or child component, undoing that change only affects the manual change caused by t ...
[CrashReport] MetalRHI crash - void FForwardLightingParameters::Set<FRHICommandList, FRHIPixelShader*>
UE - Graphics Features - Jul 20, 2017This is a common crash affecting Mac users in 4.16. User DescriptionsI tried to build the lighting and it keeps crashingWhenever I attempt to build the project or change the preview rendering to IO ...
Construction Script Does Not Update Parameters Of An Actor Component
UE - Gameplay - Oct 16, 2018The construction script does not update the parameters of the actor component. Found in 4.19 CL# 4033788, 4.20 CL# 4369336, 4.21 Preview 1 CL# 4435822, 4.22 CL# 4470579 ...
Material Instance Can't Update Material Parameters Defined in a Material Function Within a Material Layer
UE - Rendering Architecture - Materials - Nov 21, 2018When you edit the parameters of a material function that is within a material layer from the material instance, the material instance does not update. Found in 4.20 CL# 4369336, 4.21 CL# 4541578, a ...
Incorrect/Different hard shading on meshes in Forward Shading
UE - Graphics Features - Dec 18, 2018With forward shading enabled in 4.21 shading appears to be too hard on certain faces. This is working as expected in 4.20 CL# 4369336 Found in 4.21 CL# 4613538 and 4.22 CL# 4666322 ...
VertexInterpolator Makes Landscape Materials Fail to Compile
UE - Graphics Features - Jan 7, 2019If a VertexInterpolator is used in a material that is applied to a landscape the material will fail to compile. Found in 4.20 CL# 4369336, 4.21 CL# 4.21 CL# 4613538, 4.22 CL# 4681912 ...
Foliage LOD's Screen Size Can't be Set Higher Than 1.5
UE - World Creation - Worldbuilding Tools - Foliage - Jan 31, 2019Foliage LOD's Screen Size Can't be Set Higher Than 1.5 Found in 4.20 CL# 4369336, 4.21 CL# 4753647, 4.22 CL# 4827620, 5.1 CL 20024840 ...