75d1723518
Now the conversion code uses mesh element mapping to speed up lookups. Gives really nice speed improvement here, but the cost is higher memory usage during refiner construction. On the dragon scene here topology refiner construction time goes down from 5 seconds to around 0.01. It's possible to reduce the memory footprint by allocating mapping in stages (don't allocate all of them at once, but do it on demand only and free them after they're not needed anymore).