Sprite, set Z order right.

Do you feel my pain?

What would be a good approach? Objects in this game move, so how would I keep them in the right order?

Right now I am thinking of some hackish, loop that checks all objecs Y position.

<img src="http://i1294.photobucket.com/albums/b603/oliverschoening/overlap_zps82fd21a7.png" border="0" />

I'm using this system :

Just add every objects in a family (eg "All")

System -> For each All order by All.Y ascending -> All move to top of the layer.

I'm always a little iffy about using For Each too much. If you have a lot of stuff onscreen, I can imagine it causing slowdown at some point.

The way I do it relies on collisions instead, also using a family for all objects.

+"Sprite" overlaps "All"

+Sub: Sprite.Y > All.Y

-Sprite - move in front of All

+Sub: Sprite.Y < All.Y

-Sprite - move behind All

That way you only check and change the Z order when it's actually necessary (when things collide).

Though you do have to have these events for every object that might change it's Z order.