Crash opening project with Hair assets

Physics - Jun 30, 2020

Crash occurs when the user opens the linked project, which has Hair assets. [Link Removed] ...

Crash if the setting of PhysicalAnimationComponent is changed in the same frame as teleport processing

Physics - Apr 24, 2020

Crash when ApplyPhysicalAnimationProfileBelow node and UPhysicalAnimationComponent :: UpdateTargetActors by UPhysicalAnimationComponent :: OnTeleport run in the same frame. Because RuntimeInstanceDa ...

Niagara and Groom causes exception crash on Launch when using

Physics - Mar 2, 2020

Trying a Launch after every step shows that the problem occurs as soon as the GroomAssetSystem is added to Niagara. If the GroomAssetSystem is removed, the game launches fine (but the hair doesn't m ...

Failed assertion on creating a basic chaos geometry collection and PIE

Physics - Jan 23, 2020

User encounters a failed assertion when trying to create a simple geometry collection from a box ...

Clothing Data paint doesn't effect visible mesh

Physics - Jan 7, 2020

Skeletal mesh sections with cloth should have their visible mesh match their simulated mesh and this should be effected by painted values. Any vertices left unpainted(at 0) after the initial paint, ...

Client Build Errors with VS 2019

Physics - Nov 11, 2019

When building UE 4.23 from source using VS 2019, there are compile errors when building the Targets DebugGame Client and Development Client. Note that Debug Client builds successfully. The errors ar ...

SkeletalMeshSimulationComponent does not work

Physics - Oct 28, 2019

SkeletalMeshSimulationComponent does not effect the simulation of geometry collections to interact with skeletal meshes and setting the component to dynamic results in a crash. ...

Strange intermittent CCD behavior on constrained physics bodies

Physics - Oct 23, 2019

There is some strange issue with CCD where constrained CCD objects can get velocity nulled when hitting things while constrained, its very hard to reproduce normally in engine but happens often in V ...

Chaos No Editor Development Build Errors

Physics - Sep 30, 2019

During run-time of a no editor development build using chaos, errors with GeometryCollectionDrawComponent are logged and Geometry Collections remain floating in the air, not fracturing as expected. ...

Collisions aren't disabled by UPhysicsConstraintComponent in non-blocking streaming levels

Physics - Sep 5, 2019

When using a constraint to disable collision between the constrained bodies, collisions are not ignored if the constraint is part of a streamed in sub level that does not block on load. This also oc ...