"If Object1 is overlapping/colliding with Object2" Help

Unity Engine
1

Hello all!

I’m having troubles with a certain aspect of my game that involves the player clicking the mouse when one sprite is overlapping the other (I’m using the 2D workspace).

I figured, since both sprites are on the same Z axis and what not, I’d be able to simply use Colliders to detect when they’re colliding. This however was not the case as I tried using the OnCollisionStay2D function and it returned no results. This however seems to be more of a problem with the function as when I made an ‘If’ statement that printed that the two objects were touching ‘Else’ print “they’re not touching”. Neither of those printed…

Does anyone have any ideas as to how I can implement this? Basically what I want is that, if the player presses the mouse button when object1 is overlapping object2 it adds a point, if theyre not touching, the player loses.

Thanks in advance :smile:

EDIT: This seriously has to be the weirdest rule I’ve encountered. It turns out the reason why it wasn’t being detected is because it was kinematic. Sorry everyone if this was a really nooby thing to miss but yeah, it was kinematic.
I got around the gravity thing by setting the RigidBody2D component’s “Gravity Scale” thing to 0 and everything is working fine and dandy now.
Oh and if you’re in the same situation that I was, please don’t forget to make one of them a trigger if they are going to be overlapping!

2

Are the Colliders you’re using Collider2D-based or are they Collider-based? (do the components have “2D” at the end of their name?)

3

You can try this:

private bool hasCollision;
// Use this for initialization
void Start () {
	hasCollision = false;
}
void OnCollisionEnter2D(Collision2D coll) {
	if(coll.transform.tag == "tagtocheck"){
		hasCollision = true;	
	}
}
void OnCollisionExit2D(Collision2D coll) {
	if(coll.transform.tag == "tagtocheck"){
		hasCollision = false;	
	}
}
// Update is called once per frame
void Update () {
	if(Input.GetMouseButtonDown(0)){
		if(hasCollision){
			//addPoints
		}
		else {
			//loose
		}
	}
}
4

Yes they both have the 2D collider components.

5

Thanks for that idea and the bool variable will probably carry on into the game so thank you a lot!
However, when both the objects collide the bool doesn’t turn into true, instead, it’s always false… any ideas as to why this happens?

Also, if anyone knows a way I can easily just put object1 in front of object2 and just see when object1 is in front of object2 that’d be great. I tried using raycasting but for one thing I can barely understand what the hell is going on and for another, object1 is much smaller than object2.

Thanks for the replies :slight_smile:

6

do they both have rigidbodies?
both aren’t kinematic?
both can collide in the 2d layer matrix?

sounds like the function isn’t even being called

7

A quick little update. I’ve tried using triggers and making object1 the trigger so it goes through object2 but I’ve still had no luck. In the script, I set it so that, when object2 enters the trigger of object1, it prints out a message that says “it has entered”.
I have recieved no results. I’ve even tried using the 3D triggers and nothing has happened…
Any ideas as to why?

8

Both have rigidbodies and aren’t kinematic (this would make my game not work) and I don’t know what you mean by the last part. Please elaborate because that is most probably the thing I have been overlooking that is causing this issue.

And yes, the function isn’t even being called…

9

This seriously has to be the weirdest rule I’ve encountered. It turns out the reason why it wasn’t being detected is because it was kinematic. Sorry everyone if this was a really nooby thing to miss but yeah, it was kinematic.
I got around the gravity thing by setting the RigidBody2D component’s “Gravity Scale” thing to 0 and everything is working fine and dandy now.

Thanks everyone for the input and I’ll edit the original post and what not to include this!