WorldTile System

As for identifiers I want to mention World Tiles. There are a few ways to reference world tiles but two are most useful. Firstly, "x y plane" and second, hashing.

As for X Y Plane, the game is separated into clickable tiles where all things exist. The entire game is tiles, like chess. However there is a z-plane where you can shift up and down on a new tile set. The easiest way to explain it is to go into development worlds and hold CTRL+Scroll up or down or go up a ladder, you will move planes.

Plane 1->plane 2:

Here is the simplified WorldTile code, See below...

Java

public record WorldTile(short x, short y, byte plane) {  
  public WorldTile(short x, short y, byte plane) {  
    this.x = x;  
    this.y = y;  
    this.plane = plane;  
  }

  public static WorldTile of(int x, int y, int plane) {
      return new WorldTile((short)x, (short)y, (byte)plane);
  }

  public int getX() { return this.x; }
  public int getY() { return this.y; }
  public int getPlane() { return this.plane > 3 ? 3 : this.plane; }
  public int getTileHash() {
      return this.y + (this.x << 14) + (this.plane << 28);
  }

  public boolean withinDistance(WorldTile tile, int distance) { /*...*/ }

  public boolean matches(WorldTile other) {
      return this.x == other.x && this.y == other.y && this.plane == other.plane;
  }
}

Notice getTileHash() on line 15. It is the same as the programming technique called hashing, where you can create a different number for every use case, this way you can reference the WorldTile in a different way.

As for the code source, hashing is a bit rare but its good to know.