Collision & 2D

Questions & Answers
1

I’m about to make a 2D game in unity, but I’d like to know how to work with planes.
Obviously the easier way to do this would be using the box collision detection, and I understand how to do this.
My question is about how to do the collision tests over non square objects?

Thanks.

2

If you use 3d models but the game is 2d (seen from above of platformer style) you can use Mesh Colliders. If not, you could attach some empty objects with small box or sphere collidres as children in few places so that they trigger when objects meet.

3

You might be interested in the “2D ColliderGen” Extension, it allows you to automatically generate MeshColliders for your game objects from a sprite image’s alpha-channel.
http://pixelcloudgames.com/tools/2d-collidergen