Multithreaded RayCast Issue

[Bonus]

I've developed miltithreaded game engine using BEPU. It's works fine, but sometimes BEPU crashes in "internal void RayCast(ref Ray ray, IList<BroadPhaseEntry> outEntries)" in DynamicHierarchyNode.cs with "Collection was modified; enumeration operation may not execute."
RayCast called from worker thread.

[Norbo]

Is it running in parallel with the physics update? The broad phase update will interfere with any queries going on at the time, so it's not allowed. All BroadPhases expose a Locker property which is held when the BroadPhase updates. You can lock it before performing a raycast to ensure that it won't get corrupted.

[Bonus]

Is it running in parallel with the physics update?

yes

You can lock it before performing a raycast to ensure that it won't get corrupted.

Thanks! It's works.