Doing parallaxing with values instead of layers?

[Outcast]

I didn't make this one (no idea who the author was, this ollld), but it's pretty much what you're after. The example uses active system box objects instead of active objects, but it would be easy to re-create with actives if you really wanted to.

Attachment 10104

Hm I have never used system boxes so i dont know what is going on in this example. But I did add a float movement active that you can steer back and forth that moves smooth. If you move the active and look at the background, especially the grey boxes you can see that they dont move smooth at all :/