Unreal Engine Issues

Crash when merging Skeletal Mesh with incomplete LOD streaming

SummaryMerging a Skeletal Mesh whose LOD streaming has not completed crashes with an AccessViolation while the vertex copy reads the Null buffers of LODs that have not been streamed inRoot cause is ...

Deadlock while cooking groom bindings

Hi, we are experiencing random deadlocks while cooking groom bindings. We have integrated 5.8 mutable into 5.6 and are still experimenting those deadlocks which seem due to : UE_DEPRECATED(5.4, "Th ...

StableSpringsSystem has lots of warnings

System successfully compiled with 16 warnings. /Engine/Generated/NiagaraEmitterInstance.ush:2732:250: note: variable 'OutMaterialMultiplier' is declared here void SolveDistanceSpringMaterial_Emitter ...

Trying to view transient skeletal merged mesh crashes engine

Using the Merge Meshes blueprint function within the Skeletal Merging Library. It does seem to work in that I see my merged mesh in a PIE environment, but if I double click on the transient mesh I g ...

Geometry collection : Should allow newly broken pieces to go through their own collision detection and constraint solve before the next iteration

Chaos Fields: LS_MasterField continuously creates components every frame and never cleans them up

While active and ticking, the built-in FS_MasterField actor instance continuously creates several new components every frame, which are never cleaned up until the actor is destroyed. This can happen ...

Skeletal Mesh Cloth - Removing cloth collision sources doesn't remove the prerequisite, and the collision sources are not updated

[Link Removed] See proposed fix from partner: [Image Removed] ...

GroomComponent: SetVisibility(false) causes per-frame simulation reset instead of stopping it

UGroomComponent::TickComponent sets bResetSimulation = true every frame when the component is not visible. This causes NiagaraDataInterfaceHairStrands to triggering a full simulation reset every fra ...

Cluster Group Index Causes Incorrect Break Events in Geometry Collections

More details in this [Link Removed] ...

Cloth - Assertion failed: SimData->LODIndex != INDEX_NONE && SimData->LODIndex <= LOD when using the rewind debugger with multiple LODs cloth

The LOD switching when the simulation is paused could still be causing problems when the simulation is paused while the LOD indexes are going up because there is no LOD Bias mappings by default. Se ...