How do I make Physics2D.IgnoreLayerCollision only ignore physical hard collisions and not trigger collisions?

Question

I just discovered how to ignore collisions and it's really helpful. I want it because I want some treasure in my game to both have a physical hard collider, and a trigger for when my player touches it. I don't want my player to collide physically with the treasure, but I do want my treasure to collide physically on the ground and not fall through.

Unfortunately when I used Physics2D.IgnoreLayerCollision it also ignores my Trigger collider that I use for when my player walks over the treasure to pick it up. I want the trigger collider to be enabled, and the physical hard collider to be disabled.

Here's my code:

public class colliderTreasureScript : MonoBehaviour
{
    public Rigidbody2D rb;
    public float jumpforce;
    public float speed;
    public LayerMask playerlayer; // 8
    public LayerMask treasurelayer; // 9
    // Start is called before the first frame update
    void Start()
    {
        Physics2D.IgnoreLayerCollision(8, 9, true);
        Physics2D.IgnoreLayerCollision(9, 8, true);
        Physics2D.IgnoreLayerCollision(9, 9,true);
        rb = GetComponent();
        rb.AddForce(Vector2.up * jumpforce * Time.deltaTime, ForceMode2D.Impulse);
    }

Here's another script for picking up the treasure

public class GenericTreasureScript : MonoBehaviour
{
    public float rotatespeed;
    private Player playerscript;
    public int treasurevalue;
    public Transform movetowardsposition;
    public float speed;
    public bool touched;
   // public CircleCollider2D heavycollider;
    // Start is called before the first frame update
    void Start()
    {
        movetowardsposition = GameObject.Find("ScorePositionUpdated").transform;
        touched = false;
        playerscript = FindObjectOfType();
        //rotatespeed = Random.Range(140, 155.3f);
        speed = Random.Range(18, 22);
    }

    // Update is called once per frame
    void Update()
    {
        if (touched == true)
        {

            transform.position = Vector2.MoveTowards(transform.position, movetowardsposition.position, speed * Time.deltaTime);
        }
        if (Vector2.Distance(transform.position, movetowardsposition.position) < .2f)
        {
            destroy();
        }
}

 private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.CompareTag("Player"))
        {


            playerscript.score += treasurevalue;
            touched = true;
            StartCoroutine("destroyBackup");
        }


    }

user_13794611 · Answer

I dont want my player to collide physically with the treasure, but I do want my treasure to collide physically on the ground and not fall through

If you want to separate the physical and trigger collider to still trigger on player contact but not cause collision.

You can either:

Remove the RigidBody2D completely, the object that gets triggered does not need a RigidBody2D only the player would in your case and remove the physical collider
Keep the RigidBody2D but set the gravityScale to 0 and remove the physical collider
Add another extra layer and move the physical collider onto another parented game object with that layer for example "treasurephysicallayer", then disable the collision only between that layer and the player instead of the layer were both colliders reside on

Example Number 3:

public LayerMask playerlayer; // 8
public LayerMask treasurelayer; // 9
public LayerMask treasurephysicallayer; // 10

// Start is called before the first frame update
void Start() {
    Physics2D.IgnoreLayerCollision(8, 8, true);
    Physics2D.IgnoreLayerCollision(8, 10, true);
    Physics2D.IgnoreLayerCollision(10, 8, true);
    Physics2D.IgnoreLayerCollision(9, 9, true);
    Physics2D.IgnoreLayerCollision(9, 10, true);
    Physics2D.IgnoreLayerCollision(10, 9, true);
    Physics2D.IgnoreLayerCollision(10, 10, true);
}

Additionally setting the layers via. code is possible, but setting them in the Physics2D PlayerSettings is much easier.

You can just tick off or on the corresponding collision you are currently setting via code.

How do I make Physics2D.IgnoreLayerCollision only ignore physical hard collisions and not trigger collisions?

1 Answers