How can I tell if a Gameobject is currently touching another Gameobject with a specific tag?

Question

I've seen similar questions to this here on Stack Exchange — Game Development, but none of the answers to them have helped my problem. I am working in Unity 2019.2.18f1 with Visual Studios 2019 Community.

What I want to know how to tell when one Gameobject (the player) is currently touching another game object with a tag name of "Block". When the player collides with a "block" I want it to set: jumpPossible = true; But when it leaves the block (by jumping or falling off) jumpPossible = false;

What I currently have in my PlayerController script (the important stuff anyways):

private void OnCollisionEnter(Collision collision) {
    if (collision.gameObject.CompareTag("Block")) {
        jumpPossible = true;
    }
}

private void OnCollisionExit(Collision collision) {
    if (collision.gameObject.CompareTag("Block")) {
        jumpPossible = false;
    }
}

The problem I am having is when the player is currently on a block and then touches another block. When it leaves the one of the blocks, it will set: jumpPossible = false; and so you can't jump.

What I want for this script to do is whenever the player is touching any Gameobject with a tag of "Block" it should allow it to jump.

Answer 1

To solve this particular problem, I would store a reference to the objects in a list, instead of setting a variable. In this case, I am using a HashSet, because it is faster than using a list, can only contain each entry once and we do not want to access the objects inside.

private HashSet<GameObject> touchingObjects = new HashSet<GameObject>();

public bool CanJump => touchingObjects.Count > 0;

private void OnCollisionEnter(Collision collision) {
    if (collision.gameObject.CompareTag("Block")) {
        touchingObjects.Add(collision.gameObject);
    }
}

private void OnCollisionExit(Collision collision) {
    if (collision.gameObject.CompareTag("Block")) {
        touchingObjects.Remove(collision.gameObject);
    }
}

Aside from that: Look into the link DMGregory provided. It could have better approaches to the problem that you are facing.