planarRegionsListToProcess.pollLastPlanarRegion(); planarRegionsListToProcess.pollLastPlanarRegion(); isPlanarRegionsListComplete.set(planarRegionsListToProcess.isEmpty());
planarRegionsListToProcess.pollLastPlanarRegion(); planarRegionsListToProcess.pollLastPlanarRegion(); isPlanarRegionsListComplete.set(planarRegionsListToProcess.isEmpty());