Unreal Engine Issues
Unreal Engine Issues
A chaos vehicle that moves at very high speeds with CCD enabled on the vehicle sometimes has a collision response that is abnormal where the vehicle loses a significant amount of speed when colliding with dynamic objects configured as One Way Interaction
UE - Simulation - Gameplay - Dec 16, 2025Context: Continuous Collision Detection (CCD) is being used on a Chaos Vehicle to avoid tunneling issues with certain surfaces as it prevents any missed collisions between fast moving particles and ...
same PhysicsAsset refresh multi times when modify multi SkeletalBodySetup properties in same PhysAsset
UE - Simulation - Gameplay - Nov 20, 2025USkeletalBodySetup::PostEditChangeProperty will call OwningPhysAsset->RefreshPhysicsAssetChange(), if I modify many SkeletalBodySetup properties in same PhysAsset, will cause call OwningPhysAsset-> ...
bStaticWhenNotMoveable in Lighting category instead of Physics
UE - Simulation - Gameplay - Oct 24, 2025"UPrimitiveComponent::bStaticWhenNotMoveable"'s category is set to Lighting, not Physics. This causes it to be hidden when lighting-related properties are hidden, even though it controls physics sta ...
Body Setup of a Static Mesh with Simple Collision will pass validation, but removing it and using only a Complex collision and setting Collision Complexity "Use Complex as Simple" will fail validation: "Bone None requires at least one collision shape".
UE - Simulation - Gameplay - Oct 20, 2025Context: By default, Unreal Engine creates both simple and complex shapes, then, based on what the user wants (complex query versus simple query), the physics solver will use the corresponding shape ...
ChaosWheeledVehicleMovementComponent is breaking the const CDO contract and changes to the instances are being applied to the CDO
UE - Simulation - Gameplay - Apr 28, 2025As described by the licensee, the const CDO contract is being broken on ChaosWheeledVehicleMovementComponent. The issue the licensee is facing is that by spawning cars with different configurations, ...
In Vehicle sims, CenterOfMass override isn't factored into UpdateMassProperties
UE - Simulation - Gameplay - Mar 24, 2025Origin from this UDN ticket, https://udn.unrealengine.com/s/question/0D5QP00000sGtbO0AS/chaosvehiclemovementcomponent-intertia-tensor-isnt-adjusted-for-center-of-mass-override?fromCase=1 TLDR is th ...
Chaos Modular Vehicles Examples desynchronizes easily
UE - Simulation - Gameplay - Feb 27, 2025Chaos Modular Vehicles Examples does not replicate properly and it's easy to reach a state of desynchronization where the state stops being replicated and position/rotation of cars mismatch. As an ...
Replicating a non-root component with simulate physics enabled causes the component to be in the wrong place on spawn, on clients.
UE - Simulation - Gameplay - Jan 20, 2025When a BP spawns another, if the spawned Actor has a non-root child component that is simulating physics, on clients, immediately after spawn, the child component will have the world position double ...
City Sample vehicle does not always produce an EndOverlap Event
UE - Simulation - Gameplay - Apr 23, 2024Reported on UDN: Something in the setup of the City Sample vehicles means that if a vehicle starts inside a Box Collider Component then it won't generate an EndOverlap when exiting. Vehicles in ge ...
Request to ensure all setup parameters have units described in tooltips
UE - Simulation - Gameplay - Jan 22, 2024UDN customer requests that all parameters have units in their tooltips. Need to do a sweep and check what might be missing. This is not a regression, the information will have never been their in t ...