physics vs collisions question

If 2 physics objects (grenade and ground), can i use the "if collision at offset" action to determine if its going to hit the ground or not?

eg: if i throw a grenade, can i use if collision at offset Y 20 to check below it before it hits the ground?

Probably took you longer to ask than to try ;p Yeah can't see why it won't work. I mean, you're just checking for a collision about to happen, it's not like you're changing anything that will screw with the physics.

Yes.

If the event triggers it means the ground is in reach 20 pixels down.

Thx, I'm stuck at work and just brainstorming possibly solutions while I wait for things to happen around here.

I wasn't sure if physics objects "collide" with each other same way in the engine as 2 sprites overlapping "collide"

That's the thing, overlapping isn't a collision per se. It's more of a pre-collision thing. If you've ever messed about with arrays and tiles, then it's the same as that. Basically checking for adjacent tiles, but in the case with overlapping, it's pixels.