9
why why why (lemmy.world)
submitted 3 years ago by to c/programmerhumor@lemmy.ml
10 comments fedilink hide all child comments
 
you are viewing a single comment's thread
view the rest of the comments
[–] 1 point 3 years ago (1 child)

I work in 3D metrology and the consensus is right handed and Z up. Had no idea left handed existed!

  • permalink
  • fedilink
  • source
  • hideshow 2 child comments
    •
  • [–] 2 points 3 years ago (2 children)

    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?

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [–] 0 points 3 years ago (1 child)

    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.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 1 point 3 years 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.

  • permalink
  • fedilink
  • source
  • parent
  • [–] 0 points 3 years ago (1 child)

    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.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •