void PrepareBufferData ( [Chaos::FDirtyGeometryCollectionData](API\Runtime\Chaos\Chaos\FDirtyGeometryCollectionData) & BufferData, const [FGeometryDynamicCollection](API\Runtime\Chaos\FGeometryDynamicCollection) & ThreadCollection, [Chaos::FReal](API\Runtime\ChaosCore\Chaos\FReal) SolverLastDt )