Cannot change Collision Profile of BP component instances

UE - Simulation - Physics - Oct 24, 2019

BP instances placed in level cannot have their components' collision profiles modified to anything other than default and custom. Note that this did not occur in 4.22 (after applying the separate ...

Strange intermittent CCD behavior on constrained physics bodies

UE - Simulation - 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 ...

PHAT Mass Properties don't account for COM offset and Physical Material changes

UE - Simulation - Physics - Oct 17, 2019

Changes in an applied physical material are not automatically picked up by the PHAT mass properties display. A manual refresh is required for the display to update to the correct values. Adjustin ...

Skeletal Meshes have physics collisions lag

UE - Simulation - Physics - Oct 2, 2019

Skeletal mesh's physics collision lag behind the actual mesh. It didn't matter if there was just a root bone or multiple bones/constraints. This doesn't happen when using static meshes. The effect ...

Chaos No Editor Development Build Errors

UE - Simulation - 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. ...

"Weld Simulated Bodies" Collision flips when welding Skeletal mesh to Static Mesh

UE - Simulation - Physics - Sep 20, 2019

Collision flipped when welding a skeletal mesh to a static mesh. Welding Skeletal mesh as parent actor does not cause collision to flip. Showflag.Collision 1 shows correct collision. (However px ...

Chaos + iOS Preview rendering crash

UE - Simulation - Physics - Sep 11, 2019

Geometry Collection crash on PIE in iOS preview. ...

Lock rotation does not appear to work when overlapping with other actors

UE - Simulation - Physics - Sep 11, 2019

If an actor is simulating physics, it appears that it will still rotate around a locked axis if it overlaps with another static mesh ...

Imported Custom Convex Collision Mesh has Topology Modified

UE - Simulation - Physics - Sep 11, 2019

Importing custom pre-triangulated UCX collision data, can modify the topology of the mesh producing an inaccurate collision shape. ...

OnHit not firing when capsule collider passes onto very close and same height mesh

UE - Simulation - Physics - Sep 10, 2019

When a capsule collider passes from the top of one piece of geometry to another that is very close the OnHit event doesn't fire. I have attached a project that demonstrates the issue in 4.23. A vid ...