View difference between Paste ID: nrqVcQBN and EwteVthL

 width = tonumber(arg[1])
 length = tonumber(arg[2])
-current_x = 0
+height = tonumber(arg[3])
-current_y = 0
+
 require("movement")
-function move_back_to ( y )
+
-turtle.turnLeft()
+-- mod three layers
-turtle.turnLeft()
+for z=0,(math.floor(height/3)-1) do
-while current_y > y do
+    layer = 3*z+1
-turtle.dig()
+    move_z_to(layer)
-turtle.forward()
+    for x=0,(width-1) do
-current_y = current_y - 1
+        if x % 2 == 0 then
             for y=0,(length-1) do
-turtle.turnLeft()
+                move_to(x,y)
-turtle.turnLeft()
+                turtle.digUp()
                 turtle.digDown()
             end
-function move_forward_to ( y )
+        else
-while current_y < y do
+            for y=0,(length-1) do
-turtle.dig()
+                move_to(x,length-y-1)
-turtle.forward()
+                turtle.digUp()
-current_y = current_y + 1
+                turtle.digDown()
-end
+            end
         end
     end
-function move_left_to ( x )
+
-turtle.turnLeft()
+
-while current_x > x do
+-- remainder term
-turtle.dig()
+for z=0,((height%3)-1) do
-turtle.forward()
+    layer = 3*math.floor(height/3)+z
-current_x = current_x - 1
+    move_z_to(layer)
     for x=0,(width-1) do
-turtle.turnRight()
+        if x % 2 == 0 then
             for y=0,(length-1) do
                 move_to(x,y)
-function move_right_to ( x )
+            end
-turtle.turnRight()
+        else
-while current_x < x do
+            for y=0,(length-1) do
-turtle.dig()
+                move_to(x,length-y-1)
-turtle.forward()
+            end
-current_x = current_x + 1
+        end
     end
-turtle.turnLeft()
+
 
 -- go back
-function move_to ( x , y )
+
 move_z_to(0)
-if x > current_x then
+