Steps to Enable Triggers but Disable Collisions Between Layers in Unity

In Unity, you can use the Layer Collision Matrix to define how the different layers interact with each other in terms of collisions. To disable collisions between two layers but not ignore triggers, you can do the following:

1. Open the Physics window in the Project Settings by going to Edit > Project Settings > Physics.
2. Click on the Layer Collision Matrix tab.
3. In the Layer Collision Matrix, find the intersection of the two layers you want to disable collisions between.
4. Uncheck the box at the intersection of the two layers to disable collisions.
5. Create a script to detect when the trigger is entered or exited, and handle it appropriately.
6. Attach the script to the GameObjects that represent the items in your game, and they will be picked up when the player enters their trigger collider.

This  is an example script that demonstrates how you can use triggers to detect when the player enters the trigger collider of an item, and pick it up:

using UnityEngine;

public class ItemPickup : MonoBehaviour

{

    // Called when the player enters the trigger collider of the item

    private void OnTriggerEnter2D(Collider2D other)

    {

        if (other.gameObject.layer == LayerMask.NameToLayer("Player"))

        {

            // Pick up the item

            // ...

        }

    }

}

 

You can attach this script to the GameObjects that represent the items in your game, and they will be picked up when the player enters their trigger collider.

You can use the Layer Collision Matrix in your Unity game to prevent collisions between layers while still allowing triggers to be recognized and handled. If you want to prohibit objects from colliding while still allowing them to interact in other ways, like picking up things or setting off events, this can be handy.