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Best Way To Detect Collision Between Tile and Other Object and Get Tile Position

Discussion in '2D' started by Shmoji, Jan 23, 2019.

  1. Shmoji

    Shmoji

    Joined:
    Nov 16, 2017
    Posts:
    14

    
Vector3Int coordinate = grid.WorldToCell(toolColliderPosition);
    
cottonMap.SetTile(coordinate, null); // Remove tile


    Using the SetTile method above can remove a tile and I have successfully observed that. However, I have a rotating object in my game with a collider, but it cannot seem to get the correct position for the tiles.

    All I want is when the rotating object collides with a tile, the tile should be deleted.

    In a tilemap, you only have one TilemapCollider2D object, but you can still remove individual tiles. I just do not know how to do it accurately. So, in order to remove a tile, I first need the Vector3 that corresponds to the grid cell it is at. I thought I could use WorldToCell to help me with that, but it is not accurate at all.

    What would you do? Any ideas?
     
    Shmoji, Jan 23, 2019
    #1
    Shorely likes this.

  2. ChuanXin

    ChuanXin

    Unity Technologies

    Joined:
    Apr 7, 2015
    Posts:
    1,068
    This was used in a TilemapCollider2D demo here from 2d-techdemos.

    Code (CSharp):
    1.  
    2. void OnCollisionEnter2D(Collision2D collision)
    3. {
    4.     Vector3 hitPosition = Vector3.zero;
    5.     foreach (ContactPoint2D hit in collision.contacts)
    6.     {
    7.         hitPosition.x = hit.point.x - 0.01f * hit.normal.x;
    8.         hitPosition.y = hit.point.y - 0.01f * hit.normal.y;
    9.         tilemap.SetTile(tilemap.WorldToCell(hitPosition), null);
    10.     }
    11. }
    12.  
    As the collision points are generally on the edge of each Tile, extending the collision normal will give a better result.
     
    ChuanXin, Jan 24, 2019
    #2

  3. ChuanXin

    ChuanXin

    Unity Technologies

    Joined:
    Apr 7, 2015
    Posts:
    1,068
    Certainly, that works. However, with a large number of Tiles, you would want to composite and reduce the number of collider shapes, especially if they form a contiguous area.
     
    ChuanXin, Jan 24, 2019
    #3

  4. Durium

    Durium

    Joined:
    Feb 1, 2020
    Posts:
    30

    Hello! Contacts can no longer be used, how can we achieve this ? :)
     
    Durium, Feb 27, 2022
    #4

  5. ChuanXin

    ChuanXin

    Unity Technologies

    Joined:
    Apr 7, 2015
    Posts:
    1,068
    ChuanXin, Feb 28, 2022
    #5
    MiroBrodlova and spark-man like this.

  6. Ziplock9000

    Ziplock9000

    Joined:
    Jan 26, 2016
    Posts:
    360
    Can we get a code example within an OnCollisionEnter2D event?
     
    Ziplock9000, Apr 4, 2023
    #6
    MiroBrodlova likes this.