collision direction

Physics
1

Hi everyone, is there a simple way to check the collision direction? i mean, if i have two instances of the same gameobject and the 1st obj collide the 2nd one, i need to know whitch of them is ahead then the other one will follow. here a sketch:
http://imageshare.web.id/images/94864rh2dsevggdxsovv.gif

thanks for the patience.

2

It depends on what the objects are doing. You might be able to check their positions in world space (eg, which one has the highest Z coordinate) to see which one is ahead. If it is a matter of which object can see the other one in front, you can do it with a bit of vector arithmetic.

Subtract object A’s position from object B’s:-

var heading: Vector3 = b.position - a.position;

Then, get the dot product of this heading vector with object A’s transform.forward:-

 var dot: float = Vector3.Dot(heading, a.forward);

This value will be greater than zero if object B is ahead and less than zero if it is behind (it will be equal to zero in the unlikely event they are both exactly side by side).

3

Thanks andeeee, it works like a charm.