• MacN'Cheezus@lemmy.todayOP
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      10 months ago

      The Z axis is usually used for depth, so it’s going to be perpendicular to whatever your frame of reference (i.e. projection plane) is.

      If it’s upright in space, like a computer screen, the Z axis will be horizontal. If it’s a sheet of paper on a desk, then yes, I suppose it could be argued to be vertical instead.