Developer Notes

This happens because the impulse reported by physx for sphere sphere collision is extremely small.


When moving a sphere using Add Actor World Offset, hit events on that sphere are not fired. However, doing the same thing with a cube causes hit events to fire off as expected.

When you enable gravity on the sphere (which is simulating physics) then the hit events fire off as expected.

Found in 4.10.4 binary. Reproduced in 4.11 Preview 7 binary and Main CL 2894512

Steps to Reproduce

1. Open the attached project
2. PIE

Result: Notice that the cube is firing hit events, but the sphere is not, although the two spheres are colliding.

Expected: Both the cube and sphere would fire hit events.

Community References

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Won't Fix
ComponentUE - Gameplay
Affects Versions4.104.114.12
Target Fix4.13
Fix Commit2872498
CreatedMar 14, 2016
ResolvedJun 27, 2016
UpdatedApr 27, 2018
View Jira Issue