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C#-Quelltext

//This scriptt is attached to the tilemap "Grounds"
public class SpriteToPrefab : MonoBehaviour
{
    private Tilemap chocolateGround;
    
    public GameObject Prefab;

    private Vector3 getCenterOfCell()
    {
        Tilemap map = GetComponent<Tilemap>();
        Vector3Int cellPosition = map.LocalToCell(transform.localPosition);
        transform.localPosition = map.GetCellCenterLocal(cellPosition);
        return transform.localPosition;
    }

    // Start is called before the first frame update
    void Start()
    {       
        chocolateGround = GetComponent<Tilemap>();

        chocolateGround.origin = new Vector3Int(-7, 1, 0);
        chocolateGround.size = new Vector3Int(15, 10, 0);
        
        var bounds = chocolateGround.origin + chocolateGround.size;
       
        //This code only works when the brush is set on "Default Brush"!
        for (int y = chocolateGround.origin.y;        y < bounds.y;    y--)
        {
            for (int x = chocolateGround.origin.x;    x < bounds.x;    x++)
            {                
                var centerOfCell = getCenterOfCell();

                //create a prefab in memory!
                Instantiate(Prefab, centerOfCell, Quaternion.identity); 
            }
        }
    }
}