explosion/selecting everything inside a sphere

Question

let's say I have an explosion.

there's a centre of explosion (Vector3, point in space) and there's a sphere around it, with certain radius.

how to detect which objects in the scene are "inside" this sphere's radius?

Answer 1

Best Answer

Answer by Eric5h5 · Dec 18, 2010 at 10:46 PM

Use Physics.OverlapSphere (as long as the objects you're interested in have colliders).

Add comment · Show 2 · Share

The_r0nin · Dec 19, 2010 at 12:12 AM 0

Share

Ahhh. Didn't remember that. Good answer! BTW, what's the difference in performance overhead between that and a simple Vector.Difference?

Eric5h5 · Dec 19, 2010 at 12:35 AM 0

Share

Not sure, but I imagine OverlapSphere is faster since it's running natively.

Answer 2

Answer by The_r0nin · Dec 18, 2010 at 10:43 PM

Basically:

if (Vector3.Distance(enemy.transform.position,explosion.transform.position)<radiusOfSphere){
    // do stuff here
}

This will measure from the pivot of the target object, so you might not get a true if its center is outside of the sphere (even though part of it might be inside). You could also instantiate a spherical object and check for collisions (if everything else has colliders). It depends on how exact you want your explosion effect...

Add comment · Share

explosion/selecting everything inside a sphere

2 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions