• heeplr@feddit.de
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    1 year ago

    How does projection work in your field? X, Y, Z get converted to X, Z and 2D screen planars have no Y axis?

    Who invented this, why did she do it and where to send my official letter of complaint?

    • Pelicanen@sopuli.xyz
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      1 year ago

      I thought right-hand rule with Z up as thumb was standard in science? You usually project on the xy-plane, for example when calculating the distance to objects on a flat surface.

      • heeplr@feddit.de
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        1 year ago

        I only know thumb = motion/current but now since you say, it’s clear: people used x/y for 2D logically but the 2D plane used to be paper. which is parallel to the earth surface (usually). Computer screens are perpendicular so Y points up, not away from you.

        So this makes sense with paper, TIL. With computers, Z traditionally means depth.

    • yopyop@feddit.de
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      1 year ago

      TBH I’m not sure I totally understand the question but projection is very useful to decompose the orientation of elements, like a cylinder that you just measured with a machine or a scanner. The coordinates and orientation (angles) can be projected in the three main planes XY, YZ and ZX.

      • heeplr@feddit.de
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        1 year ago

        Sorry for being unclear, I was talking about screen projection. For actual rasterization.