2D rotation through z??

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Hi there

I'm creating a 2d game and have made all the correct setup (or at least I think I have). Using orthographic camera etc..

I am transforming my sprite on click, but having to do it through Z. Can someone explain to me why Z and not X.

transform.Rotate(0,0,-90)

edit: sorry forgot yo mention i am using ex2d not sure if that's relevant though

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Answer by Lovrenc · Jan 11, 2013 at 05:55 PM

Well in unity Z is forward axis. Thats it. It's just the way they inplemented coordinate system.

Z - forward
Y - up
X - right (or left? not sure)

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curv · Jan 11, 2013 at 05:58 PM 0

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So my setup isn't wrong then, this is just Unity design?

$$anonymous$$ · Jan 11, 2013 at 05:59 PM 0

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even if you create a 2D game, Unity is 3D. If your scene is set up in a way that your left/right is on X and your up/down is on Y, "2D" rotation is around Z. You can see that if you look at the axis gizmo in the scene view.

Lovrenc · Jan 11, 2013 at 06:02 PM 0

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Well you could arrange your scene to work in X/Y fashion, but i would not recomend it as it would break synergy with unity builtin functions and would have to correct/predict/remember a lot of things to keep the game working.

$$anonymous$$ · Jan 11, 2013 at 06:09 PM 0

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btw I don't really understand the question. It can only be Z in this case, that's how the math works. If it's strange to you that you're using a third axis in a 2D game, well.. if you wanted to achieve the same rotation in a 2D sheet of a coordinate system, you would stick an imaginary needle through the sheet so it's sticking out of it perpendicularly, and you would rotate your 2D object around that.. the needle is the Z axis, if this helps. It's not necessarily Unity's design, it's math.

curv · Jan 11, 2013 at 06:20 PM 0

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No this makes sense, thanks guys.

2D rotation through z??

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