How can I assign a layer to tiles on an individual level?

Question

I've just started out with my first game in Unity. It's a simple 2D Platformer with a tile-based level.

When coding in the movement, I used the Physics2D.OverlapCircle() and an empty to check whether my player was touching the ground. However, I need to use a layer to make sure only the ground is detected.

my code below

//fixed update used for physics calculations
void FixedUpdate()
{
    //right or left arrows being pressed
    float moveX = Input.GetAxis("Horizontal");

    Vector2 moveDir = new Vector2(moveX * playerSpeed, rb.velocity.y);
    rb.velocity = moveDir;
}
 
//update used for spacebar input and force
void Update()
{
    if (Input.GetKeyDown(KeyCode.Space)) 
    {
        rb.velocity = Vector2.up * jumpForce*Time.deltaTime;
    }
    
    //is my circle overlapping any other colliders
    Collider2D collider =  Physics2D.OverlapCircle(feet.position, checkRadius, groundLayer);
    Debug.Log(collider); 
}

When I tried assigning layers to my tiles, I couldn't find a way to do it.

I would be really grateful if anyone could show me how to, or if anyone can tell me a more efficient way to deal with jumping in a 2D platformer.

Answer 1

You are using a tilemap. That means tiles aren't game objects. All the tiles on a tilemap become a part of the Tilemap game object. If you just want to set whether a tile in your tile palette is solid or decorative, then you do that by setting the "Collider Type" in the settings of the tile asset. The colliders of all tiles on a Tilemap are then combined into the TilemapCollider2D component of the Tilemap game object. Which means that all the tiles of the tilemap are welded into one solid game object. So if you want to filter collisions with tiles using physics layers, you need to assign that layer to the whole Tilemap.

Unfortunately there is no way to assign tiles on the same Tilemap to different layers. If you need this functionality for some reason, then you can use multiple tilemaps with different physics layers. Or if the objects that require a different physics layers aren't too many, you might want to consider to represent them with regular game objects on top of the tilemap instead.

Answer 2

I'm Assuming you are using tiles as prefab. So just change the layer of walkable tiles in the main prefab.

Also, you can manually add the layer via script.Referance

Make a tile script and add it to the tile prefab.