How to do physics queries AFTER the physics update?

I need to do a CalculateDistance after all the physics bodies have moved with their velocities, but before the end of the frame. I was expecting to find a ExportPhysicsWorld.PhysicsWorld which I can call CalculateDistance from, but it doesn't seem to be there (no public PhysicsWorld in that system)

Right now I have a system that updates after EndframePhysicsSystem, and uses BuildPhysicsSystem.PhysicsWorld to do a CalculateDistance. The colliders seem to not be properly updated at that point

 

The collision world is updated only in BuildPhysicsSystem by default, so that you can do queries in parallel with simulation. Therefore queries will hit the "previous" world state. However you can opt into ExportPhysicsSystem also updating the collision world by setting SimulationStepInput.SynchronizeCollisionWorld to true.

 

This sounds like exactly what I need. However, looking at the code, it seems there is no public variable in StepPhysicsWorld that would let us set this to true


Is the only way to do this currently to disable StepPhysicsWorld system and write our own copy nstead? (or edit physics package source code?)

If so, this would be pretty unfortunate for an asset store project that needs to rely on this

 

Ah, yes, that's a bit unlucky. However, SynchronizeCollisionWorld is something you can do on your own in a system you would plug in after StepPhysicsWorld and before ExportPhysicsWorld, just call CollisionWorld.ScheduleUpdateDynamicTree(), that's all it does anyway.

I'll work on exposing it properly for next release.