Overlapping Collider2D Triggers - unity3d

Question

Ok lets get into it.
I've got 2 colliders whose purpose it is to determine the hit type of the ball. If it is GoodHit or NiceHit (Nice is like Perfect).
The GoodHit collider2d has a much larger area than NiceHit.
The NiceHit on the other hand overlaps to a portion of GoodHit in its center.
Using this code I can determine whether the ball enters the area of GoodHit and NiceHit
void OnTriggerEnter2D(Collider2D other) {
if (other.name == "HitNice") {
hitType = 2;
} else if(other.name == "HitGood") {
hitType = 1;
}
}
void OnTriggerStay2D(Collider2D other) {
if (other.name == "HitNice") {
hitType = 2;
} else if(other.name == "HitGood") {
hitType = 1;
}
}
void OnTriggerExit2D(Collider2D other) {
hitType = 0;
}
The problem is it doesn't triggers the NiceHit and the hitType is still valued 1 regardless if the ball is in NiceHit area.
I first created the Goodhit object, that in a sense gives it a priority than NiceHit. I could swap them by names and values that way I can achieve the thing that I wanted but that doesn't really solved it.
Any workaround or tweaks I can do? Thanks!

Answer 1

You have two overlapping triggers, one of which is in the middle of a larger trigger.
Here's something to remember: if an object is inside the inner trigger, it is also inside the larger trigger!
So in your code, you use OnTriggerStay to determine if the object is in one of those triggers. Let's take a look at that:
void OnTriggerStay2D(Collider2D other) {
if (other.name == "HitNice") {
hitType = 2;
} else if(other.name == "HitGood") {
hitType = 1;
}
}
This function is executed once per trigger that the object is inside of. So this function is executed twice if it is inside of the HitNice trigger. So let's say Unity calls this function for each trigger. What is probably happening is that it's calling the handlers in a bad order (pseudocode):
OnTriggerEnter(HitNice) //hitType is 2
OnTriggerEnter(HitGood) //hitType is now 1!
Unity is calling the collider handlers from inside out, causing the result from a HitGood trigger to always override the HitNice value. I don't know for sure if that's how it works, but looking at your code it's totally a possibility of why it's not working correctly.
Now, I can't say this for sure, but I think just using your OnTriggerEnter handler will suffice. It will only trigger the hitType detection when it enters a collider rather than when it stays. Since the object must enter the outer trigger before entering the inner trigger, this means that it should always evaluate in the correct order. In that case, your code is probably working as is, but I would say that your logic should be like this:
void OnTriggerEnter2D(Collider2D other) {
if(other.name == "HitNice") {
hitType = 2;
} else if(other.name == "HitGood" && hitType != 2) {
hitType = 1;
}
}
The only caveat of this approach is that you would need to reset the value of hitType manually. Not sure exactly how your game works, but this should give you an idea of how to approach this. Your HitNice should always override a HitGood. So when OnTriggerEnter is called for HitGood, check that you haven't yet hit HitNice yet. Or even better, record both hit types in separate variables, and then resolve which type of hit it was later on when doing scoring or whatever.