diff --git a/TileGenerator.cpp b/TileGenerator.cpp
index 54adab2..de86fb6 100644
--- a/TileGenerator.cpp
+++ b/TileGenerator.cpp
@@ -235,9 +235,22 @@ void TileGenerator::renderMap()
 	}
 
 	std::list<int> zlist = getZValueList();
-	for (std::list<int>::iterator position = zlist.begin(); position != zlist.end(); ++position) {
-		int zPos = *position;
-		getBlocksOnZ(zPos, statement);
+	for (std::list<int>::iterator zPosition = zlist.begin(); zPosition != zlist.end(); ++zPosition) {
+		int zPos = *zPosition;
+		map<int, BlockList> blocks = getBlocksOnZ(zPos, statement);
+		for (std::list<std::pair<int, int> >::const_iterator position = m_positions.begin(); position != m_positions.end(); ++position) {
+			if (position->second != zPos) {
+				continue;
+			}
+
+			int xPos = position->first;
+			blocks[xPos].sort();
+			const BlockList &blockStack = blocks[xPos];
+			for (BlockList::const_iterator it = blockStack.begin(); it != blockStack.end(); ++it) {
+				std::cout << it->first.y << std::endl;
+			}
+			std::cout << "---" << std::endl;
+		}
 	}
 }
 
diff --git a/TileGenerator.h b/TileGenerator.h
index e05f385..61b760b 100644
--- a/TileGenerator.h
+++ b/TileGenerator.h
@@ -29,6 +29,28 @@ struct BlockPos {
 	int x;
 	int y;
 	int z;
+	bool operator<(const BlockPos& p) const
+	{
+		if (z > p.z) {
+			return true;
+		}
+		if (z < p.z) {
+			return false;
+		}
+		if (y > p.y) {
+			return true;
+		}
+		if (y < p.y) {
+			return false;
+		}
+		if (x > p.x) {
+			return true;
+		}
+		if (x < p.x) {
+			return false;
+		}
+		return false;
+	}
 };
 
 class DbError {