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Collider 2D Bounds before instantiation

Discussion in '2D' started by gangafinti, Nov 28, 2017.

  1. gangafinti

    gangafinti

    Joined:
    Jun 13, 2013
    Posts:
    19
    I am making a 2D online game with PUN. The game has a procedural dungeon. In that dungeon I want to spawn Items, but to make sure I don't spawn them on let's say a wall I need to check if they collide with that wall.

    The thing I discoverd is that you cannot get the bounds of a Collider2D component from a prefab that is not instantiated. This is a HUGE problem for me. Because it is really inefficient to first spawn the objects and in particular Photon gameobjects and then delete/move them if they hit something. So I need the bounds of the Collider2D badly!

    If someone could help me, it would be life saving! Since I am on a deadline!

    Thanks in advance!
     
    Last edited: Nov 28, 2017
    gangafinti, Nov 28, 2017
    #1

  2. LiterallyJeff

    LiterallyJeff

    Joined:
    Jan 21, 2015
    Posts:
    2,807
    You may want to create a config for object sizes that you can access pre-instantiation, either from a component on the prefab, a scriptable object association, or some other lookup table. The level of granularity is up to you, you could do per-object config, or several categories of objects with varied bounds.
     
    LiterallyJeff, Nov 28, 2017
    #2

  3. MelvMay

    MelvMay

    Unity Technologies

    Joined:
    May 24, 2013
    Posts:
    11,492
    The bounds are generated from the actual physics shapes because the bounds are only known then. Calculating the bounds from the collider settings would be super slow for some colliders i.e. PolygonCollider2D, EdgeCollider2D, CompositeCollider2D, TilemapCollider2D. For CircleCollider2D and BoxCollider2D it's obviously easy.

    You could easily calculate this yourself however if you are using the simple cases.
     
    MelvMay, Nov 29, 2017
    #3
    LiterallyJeff likes this.