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

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

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

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

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

Physics - Sep 11, 2019

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

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

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

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

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 ...

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 ...

"Simulate Selected" overwrites "Physics Type" property when playing in Editor

Physics - Sep 5, 2019

"Simulate Selected" overwrites "Physics Type" property when playing in Editor. In any subsequent PIE sessions SK_Mannequin will simulate physics even though the option is toggled off. This was repo ...