this post was submitted on 01 Dec 2025
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Weird didn't everyone learn XY on paper on a desk first? All they did was add z axis to that original concept for elevation which gives us the bottom image.
Top image is like if I held paper straight parallel to my face.
When working in 2 dimensions with gravity, it is common to treat Y as up. E.g, 2d video games, physics problems, computer screens.
That's basically what it comes down to: Is your XY plane a piece of paper that you look at from the top, or is it the pixel coordinates of the screen you are looking through?
That's why X is usually not contested, because it's the same on a piece of paper that you view top-down and on a screen that you view from the front.
Y is then one of the two potential axies for either a top-down or a side-scrolling view, and Z is the remaining axis.
I not educated in 2d game design so I guess Y is used for up on side strollers is what I think is happening. Least thats what is going on in gadot based on anothet commenter.
In 2D games X is right, Y is either up or down. I haven't seen any engine where X is inverted, but Y can be either direction. Interestingly, I haven't seen Y as down in any 3D environment yet.
Screens vs paper. It's why all the engineering software uses Z-up, since they came from a paper top-down view workflow. But many of the creative software uses y-up, since they exist to create art that gets consumed on a screen. Like animation and games.
Blender and UE4 uses z as up. Which was intuitive to me having been taught that in school but Looks like industry standard for 2d focused engines use Y up based on this comment from 2009. What a mess.
2022 comment:
Well no. First the teacher drew it on the board, hence Y pointing up at the ceiling.
Then we switched to paper and discovered Y pointing somewhere else was somehow the same thing.
So the right answer to the OP is probably that "they're the same picture" meme.
No. I was plugging in crazy combinations of r, theta, x, y, z, t, and anything else shown in the built-in demo of that old Mac 3D graphing calculator app years before my teachers got to explaining coordinate systems. I had no idea what most of it meant, but I could make cool looking animated graphics as a third grader...
Also, I found GameMaker which introduced me to using X to the right and Y down in 2D (with the origin in the top-left corner) before algebra was taught to me in school...
Epic mate