Check if a GameObject collides with another GameObject

Unity Engine
1

Hello everyone, I just wanted to know if there is a way to check if a GameObject collides with another simply.
In ActionScript for example, there is a Method that is called ‘hitTest’. with that, you can determine easily if an Object is in collision with another object.

for example in Flash:

if( firstObject.hitTest(secondObject) ){
 print("Object A Collides with Object B");
}

In Unity you have to create a script that you will put in a GameObject that will be something like that:

#pragma strict

static public var collisionWithObjectB:boolean;
public var ObjectB:GameObject;

function Start(){
 collisionWithObject = false;
}

function OnCollisionStay(collision:Collision){
 if(collision == ObjectB){
  collisionWithObjectB = true;
 }
}

function OnCollisionExit(collision:Collision){
 if(collision == ObjectB){
  collisionWithObjectB = false;
 }
}

And after all of this we can check whether they collide or not, so I was looking for a way (if there is any.) to make this process faster. Thanks in advance.

2

Maybe this :

var IsColliding : boolean = false;

function OnCollisionEnter(other : Collision){
if(other.gameObject.name == "ObjectB"){
IsColliding = true;
}
}

function OnCollisionExit(other : Collision){
if(other.gameObject.name == "ObjectB"){
IsColliding = false;
}
}
3

What if I want to refer to two object from another script?
For example, in Flash, you can check if two objects collide with one another by doing something like this:

if(ObjectA.hitTest(ObjectB)){/This will return true if those two object collide./}

I simply don’t want to be forced to create a script as a component in every GameObject that needs to be checked for collision purposes, but instead being able to refer to the collision between those two (or more.) from another script.

3 Likes
4

this is exactly what i want to know as well - do anybody know how to do it?