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Question by pankee · Jan 05, 2017 at 08:30 AM · unity 52dcollision detectionboundstop-down

Keep player inside a non-square/irregular shape area

I'm building a top-down twin-stick shooter with a level editor.

For gameplay reasons, the level is made of tiles, and the arena can be any shape whatsoever. For example (x representing a tile):

 xxxxxxxxxx
 xxxx  xxxx
 xxxx  xxxx
 xxxxxxxxxx    
       xx
 xxxxxxxxxx
 xxxxxxxxxx

The player can move freely inside the arena, but can't leave it. I was wondering how to check for collisions and make sure the player can't leave.

Any ideas?

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avatar image lamphung719 · Jan 05, 2017 at 09:28 AM 0
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I guess that you can easily find 4 points which are top, bottom, left, right from your matrix, and from that, you can create a collider to prevent your player leaves that box.

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Answer by kento14 · Jan 07, 2017 at 04:59 PM

I would make an empty gameObject with a 2d BoxCollider and place it in the empty area (so it fills the area without the x's). And for non-square areas, I would use a polygon collider 2D.

This will do so when the player comes to an empty tile (no x) the boxCollider/PolygonCollider 2D, will stop the player;

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