Unreal Engine Issues
Unreal Engine Issues
Destroying a welded actor is causing an Array index out of bounds crash on 5.6
UE - Simulation - Physics - Jul 30, 2025Destroying a welded actor is causing an Array index out of bounds crash on 5.6. The licensee has provided a repro project that reliably causes a crash whenever the spawned actor is destroyed. There ...
Enabling Strip Source Data On Cook on Geometry Collection is also stripping the Anchor flag of cooked assets
UE - Simulation - Physics - Jul 20, 2025Enabling Strip Source Data On Cook on Geometry Collection (GC) is also stripping the Anchor flag of cooked assets. The licensee has reported that once they do a build the Anchors disappear and GCs t ...
Crashes after destroying a skeletal mesh attached via socket name (not bone name), the destroyed mesh remains welded.
UE - Simulation - Physics - Jul 18, 2025On welding physics bodies during primitive component attachment, UPrimitiveComponent::WeldToImplementation() calls GetRootWelded() and then GetBodyInstance() on the returned root. This searches by b ...
In AnimNode_RigidBody.cpp, PhysicsSimulation->CreateActor() is being passed World Space transforms, when it should be getting Local Simulation space transforms
UE - Simulation - Physics - Jun 24, 2025In AnimNode_RigidBody.cpp, PhysicsSimulation->CreateActor() is being passed World Space transforms, when it should be getting Local Simulation space transforms. The licensee has reported that FAnimN ...
Unexpected Collision Response When Nesting Primitive Components with auto-weld enabled and physics disabled on children. The root primitive falls through floor even though it is set to block all.
UE - Simulation - Physics - May 27, 2025Context Auto-weld makes it so if a child is attached to a parent, the two bodies will be joined into a single rigid body. Physic settings like collision profile and body settings are determined by t ...
Change of rotation axis when switching solver
UE - Simulation - Physics - Apr 17, 2025This alteration was introduced in the 'Found CL' field - and is likely an unintentional side effect of adding SIMD to the solver. There is a repro project attached, open up 'TestMap' and run to see ...
Overlay materials stop working when Show Collisions
UE - Simulation - Physics - Apr 7, 2025Overlay Materials are disabled when the Collision showflag is enabled. ...
Issue when sampling landscape height at a given location using Chaos::FHeightField::GetHeightAt
UE - Simulation - Physics - Apr 2, 2025This is an issue reported from a licensee: When sample landscape height at a given location, it is likely we interpolate from the wrong triangle. [Image Removed] Details in: [Link Removed] ...
ChaosCacheManager is not recording the Observed GeometryCollections NotifyBreak states between level loading and will default to false if changed from Record to Play
UE - Simulation - Physics - Mar 28, 2025ChaosCacheManager (CCM) is not recording the Observed GeometryCollections (GC) NotifyBreak states between level loading and will default to false if changed from Record to Play. AChaosCacheManager ...
ChaosCacheManager is not reproducing Collision Events the second time you Record and Play
UE - Simulation - Physics - Mar 28, 2025ChaosCacheManager (CCM) is not reproducing Collision events the second time (and onwards) we record a Geometry Collection (GC) breaking session. Particles set to track Collision Events correctly fol ...