Collisions only in play area.

[N64Mario]

Okay, say for example, there is a flat platform at the very bottom, unseen from the game screen. They are backdrops with the type obstacle.
When my player hits this unseen platform on the current screen, he lands on it.

How can I make it so that the player should NOT land on this backdrop platform until it is visible on the screen?

[DavidN]

I think the best way to do this might be to turn it around and make sure that the player is on-screen (or below a certain Y position relative to the game window) in your "obstacle collision" events (as you obviously can't apply an event to a background object)... if that works for what you're intending to do.

[N64Mario]

Okay.

So I have a player object, and a foot detector object. I think what I need, or needed to do is make this condition.
'[Foot Detector] Y Position > Y Top Frame + [Foot Detector] Y Position < Y Bottom Frame ' to each of the collision events.

Is that right?

[DavidN]

Yes, I think that should do it.