private short[] getVisibleFromOutdoor() {
if (this.m_visibleFromOutdoor == null) {
final int size = this.size();
final TShortArrayList list = new TShortArrayList(size);
for (int i = 0; i < size; ++i) {
final short layer = this.getQuickKey(i);
if (layer <= 0) {
list.add(layer);
}
}
this.m_visibleFromOutdoor = list.toNativeArray();
}
return this.m_visibleFromOutdoor;
}
