Not using spawn - Help!

hrsmedia

So I am trying to make actors move down the screen at random positions. Initially I did this by spawning actors at random times. But I have found that because I am using a scrolling background the screen jerks/judders a bit every time the actors are spawned.

I guess I have not noticed this jerk/judder in the past because I have not used scrolling backgrounds before. (Scrolling background method: if position y <=240 change attribute position y to 720+240+position y)

So I have tried applying the same formula I am using on the background to the actors coming down the screen.
But when I try to add random to the actors like: if position y <=240 change attribute position y to 720+random(50,240)+position y and change attribute position x to random(0,320) the actors disappear off the screen.

Can anyone help?? Am I doing something wrong? Is there a better way to do this?

Edit: I should add that this method works at first, but then they start to disappear after about 20 seconds or so..

BarkBarkCo

Are you building for iPhone or iPad?

hrsmedia

iPhone

BarkBarkCo

My guess is that your expression changing the actor's Y is sending it off screen. Even with a scene set to wrap you have to keep your actors in the "safe zone" or they get destroyed.