Iterate in z,y,x order through nodes

init.lua

@@ -729,9 +729,9 @@ local calculate_noise = function(pos, noise, noiseparams, options, stats_mode)
 	end
 
 	-- Main loop (time-critical!)
-	for x=0, x_max do
-	for y=0, y_max do
 	for z=0, z_max do
+	for y=0, y_max do
+	for x=0, x_max do
 		-- Note: This loop has been optimized for speed, so the code
 		-- might not look pretty.
 		-- Be careful of the performance implications when touching this