Collision Depending On Z Axis For 2D?

Unity Engine
1

Hello. I have a question that I find interesting. Is it possible for 2D Colliders and Rigidbody2D to have 3D like collisions, depending on where the Player is on the Z axis? So for an example let’s say my position was 1 on the Z axis, and the thing I want to collide with is the same. Then let’s say on the Z axis of 3, there was another thing that I wanted to collide with. Would it be possible to only collide with the first thing when I’m on the same Z axis as it, and then if I switched my position to 3 Z axis, then I wouldn’t collide with the first thing, instead I would collide with the second one? Hope someone can answer this.

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2

You could just set the Collision Layer whenever the Z-value changes. Otherwise use appropriately constrained cylinders in 3D physics.

3

The 2D physics engine is purely 2D (it’s the Box2D engine) and has no concept of the Z axis.

–Eric

4

So I’ll have to resort to changing all of my Box Collider 2Ds to 3D, all my rigidbody2Ds to 3D, all my scripts to 3D, and so on? If so, is there a quick way to do it?

5

I’m not sure what you mean but I thought of an idea that I think goes with what your saying. Like if I was on the 1 on the Z axis, and then changed my position to 3, the colliders on the 1 Z Axis would disable, and the ones on the 3 will enable. It could work as I was already trying it, the only thing I’m worried about is how much it will affect the performance.

6

You can set up Collision Layers which determine which colliders can collide with each other. See here and here for 2D-specific.

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7

have a look at sorting layers with regards to rendering 2D scenes. that way you can swap players sorting layer, and have your player have a pseudo 3D feel.

works a bit like old school parallax backgrounds if thats the kind of feel your after. then like Pyrian says have a wee look at collision layers.

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