why why why
why why why
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Ugh, when I have to open CAD for a project at work I have to setup a new coordinate system with Z going up, every time. The engineers just work with Y up for some reason. Too lazy to change it perhaps? Solid works and Inventor default Y up? I'll never understand it. I definitely understand this meme. There's also models with an origin 10 feet off in X and 20 feet out in Y. I just do not friggin get it man.
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Because math works with Y up. Physics steal from math, engeneering steals from physics, so, here you are.
What I can't get is imperial measurement system. Apparently, nobody but americans can. And that stuff is far worse than Y and Z switching places.
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as a minecraft player learning how to use autocad, i thought y up was alot more ubiquitous then it apparently is
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That's what I don't get. Why would they make Z up when in algebra, Y is up. It's all based on math, shouldn't we keep consistent on that?
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Because the z axis is represented as an extension of the xy-plane, coming out of the paper essentially, so we represent it as up
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What I can't get is imperial measurement system. Apparently, nobody but americans can
I'm not American but I've been living in the USA for ten years and I still have trouble with imperial measurements. It's painful dealing with fractions of an inch instead of millimeters.
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That's not true though. While there isn't a standard, convention is to have z up in mathematics, as z is extending the xy plane we normally work with into a third space.
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Might depend on where you were learning.
On paper, when I was learning Descartes' coordibate system, we used Y as up and X as left-right. And when it was time to plot in 3D, we used Z to "extend" the plane into yourself and away from yourself.
You just hold your sheet of paper perpendicular to the ground (or just use a whiteboard) and it all makes sense.
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CAD used to be digital abstraction of the physical media that is 2D drawings on paper, so XY is the plane of the paper going horizontal/vertical, and most detailing are in vertical cross sections so Y ended up being up most of the time.
The Z axis is then Frankensteined into the existing system to get a proper 3D representation, so it became the depth axis for the existing XY plane.
In Minecraft it's even more evident as Notch Frankensteined the Z axis into a game engine that's originally developed for side scrolling.
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In which world should Z point up and Y represent depth?
Totally crazy opposite world, where cats hunt dogs and rain goes up? This is plain evil...! :-)
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49 comments