ReadonlyotherThe collider that entered or left the sensor.
ReadonlyotherThe body owning TriggerEvent.other.
ReadonlysensorThe sensor collider that fired.
ReadonlysensorThe body owning TriggerEvent.sensor.
ReadonlytypeWhich of §29's two trigger names this is.
Something entered or left a sensor (§29, §24).
A sensor reports overlaps but exerts no forces (Appendix B), so there is no manifold, no impulse, and no relative velocity to report — which is why this is a separate payload rather than a collision event with empty fields.
The pair is asymmetric by construction: TriggerEvent.sensor is the collider whose
sensorflag is set. When two sensors overlap, an adapter reports the pair twice, once from each side, so a listener on either sensor sees its own event.