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i am new with FRB and i dont know what kind of search key i am going to use

i have a collection of circles and i am looping in each one to determine collision
is there a way to determine who is the bumper and the bumpee

thanks

Not sure what you mean by that. There really is no such thing as bumper and bumpee if you don't have a frame of reference. If two asteroids hit in outer space, which one hit which one? Could certainly change depending on which one you were "attached" to.

On Earth if we talk about cars hitting each other, we generally have a set of rules - if you get hit from behind, you're the one who got hit. If you pull out of a parking spot unexpectedly, then you're the one who hit the other person...and so on.

So really, the question is not as much a programming question as a question of what you're trying to establish when you set this up - what's the purpose of knowing who is the "bumper" and "bumpee"?

thanks for the response

we will use the asteroids
an asteroid named aster1 is moving to another asteroid named aster2
and made contact so aster1 hits aster2 making aster one the hitter
and aster2 the hittee.
so the life of aster2 lets say they have a life will be the one that is going to be decremented
and not aster1
and we are going to use it on a loop of asteroid collection
currently i have a nested loop and i dont know if its the best practice that will iterate to the collection
and each item will iterate again on the same collection
checking if they collide and i am using the following code to check for collision
http://img708.imageshack.us/i/68813932.png/

dont know if i make it clear this time
thanks

Well, I'm not sure, but my guess would be to check the velocity of the objects and see which one is greater. Then you know which one hit the other.

didn't thought of that one
thanks for you help

dont know how to do that comparing velocity so i try this one, somehow its doing what i thought of it
(float)fallingPiece.Velocity.Length() < (float)peg.Velocity.Length() and vice versa

its working better from the previous

i think i need to explore more