If you overlap objects on the map, the draw distance for big icons seems to be based on the top object, instead of each object specifically?
Both the house tiles and door in that screen shot are constructed of big icon objects in a single row across the lowest tile of the house. The wall portions are ~9 tiles tall, and the door is ~2, they are all 1 tile wide with an icon size of 32 pixels.
This is using pixel movement, but you have to get ~20 tiles away before the wall piece disappears.
Copyright © 2015 BYOND. All rights reserved.