Unreal Engine Issues
Unreal Engine Issues
Crash when spawning multiple HISM at runtime in a packaged shipping build
UE - World Creation - Worldbuilding Tools - HLOD - Feb 25, 2021When adding multiple Hierarchical Instanced Static Meshes on a loop and packaging the project in Shipping configuration the application crashes due to LowLevelFatalError [Link Removed] [Line: 1431] ...
Unnecessary warning "LogChaosCloth: Warning: Invalid pattern data. Num pattern indices 0 != Num welded indices"... for all SKM cloth
UE - Runtime - Simulation - Apr 26, 2024This warning is technically correct, panel-based cloth is disabled, but it's expected and there's nothing the user can actually do about it. This comes from a UDN. ...
Promote to variable in a parent blueprint does not pass/preserve the non-default value in derived children blueprints
UE - Gameplay - Blueprint - Jul 11, 2018When using the feature "promote to variable" on a pin that represents a value that is not an engine default (Example: Floats = 0.0, Booleans = False, ect..), that default value (for the variable tha ...
[CrashReport] UE4Editor_RHI!TSet<TTuple<FBoundShaderStateKey,FCachedBoundShaderStateLink * __ptr64>,TDefaultMapHashableKeyFuncs<FBoundShaderStateKey,FCachedBoundShaderStateLink * __ptr64,0>,FDefaultSetAllocator>::FindId() [set.h:629]
UE - Graphics Features - Mar 23, 2018No user comments in crash group 620 FSetElementId FindId(KeyInitType Key) const 621 { 622 if (Elements.Num()) 623 { 624 for(FSetElementId ElementI ...
Pawn Blueprint cannot have variables default value set in Engine ini
UE - Gameplay - Blueprint - Jun 1, 2017When using a pawn blueprint, you cannot modify the value of a variable in the config files. This issue does not affect other kinds of blueprints, as this issue does not affect actor blueprints. Re ...
OnParticleCollide doesn't return Velocity on every bounce
UE - Niagara - Jun 2, 2017OnParticleCollide doesn't return Velocity on every bounce. In code it lists all the return pins trigger 'on kill'; however, all other pins return correctly on each bounce but the velocity does not. ...
WPO is incorrectly generated on materials using Material Attributes as input to Landscape Layer Blend node
UE - Rendering - Architecture - Materials - Jan 31, 2024This comes from this UDN : [Link Removed] It occurs with this setup : [Image Removed] , where Set Material Attributes expressions act as inputs to the Landscape Layer Blend material expression. ...
SetActorEnableCollision does not affect Destructible meshes
UE - Simulation - Physics - Destruction - Jan 4, 2016Setting the SetActorEnableCollision blueprint node to false does not disable collision for a destructible mesh. Workaround: Adding a static Mesh component and setting any mesh will cause the collis ...
Setting PHYSX_MEMORY_STATS to 1 prevents the Engine from being built successfully.
UE - Simulation - Physics - Mar 9, 2015If #define PHYSX_MEMORY_STATS 0 is set to 1, the Engine will not build successfully. The build fails with the message: error C2338: FPhysXAllocationHeader size must be less than 16 bytes. ...
Morph Targets fail to reset to zero
UE - Rendering - RHI - Jan 6, 2026"We have encountered a regression in UE 5.7 where Skeletal Mesh Morph Targets do not visually reset when all weights are set to 0.0. The mesh retains the deformation from the previous frame. This i ...