BEPUphysics

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            var broadPhaseEnumerator = new BroadPhaseOverlapEnumerator { Pool = BufferPool, References = new QuickList<CollidableReference>(16, BufferPool) };
            Simulation.BroadPhase.GetOverlaps(queryBoundsMin, queryBoundsMax, ref broadPhaseEnumerator);

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        struct BroadPhaseOverlapEnumerator : IBreakableForEach<CollidableReference>
        {
            public QuickList<CollidableReference> References;
            //The enumerator never gets stored into unmanaged memory, so it's safe to include a reference type instance.
            public BufferPool Pool;
            public bool LoopBody(CollidableReference reference)
            {
                References.Allocate(Pool) = reference;
                //If you wanted to do any top-level filtering, this would be a good spot for it.
                //The CollidableReference tells you whether it's a body or a static object and the associated handle. You can look up metadata with that.
                return true;
            }
        }