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  • Left/right hand still places z at the 3rd index. It remains a depth axis. *Edit: I think the question is more in regards to the rotation of the base axes. Commented Jul 29, 2018 at 6:16
  • Thanks, Martin. I hadn't noticed questions/17519 while posting this one. Looks like mine's pretty much a total duplicate (though nobody seems to be complaining, except for maybe that one close(1) guy:). And 17519's overall conclusion seems to pretty much mirror @Aphton 's and yours -- no canonical standard. So I'll likely stick with the mathematical convention illustrated in the question's top drawing. Re handedness, the right-hand screw rule is indeed important to me. My rotation routines all follow it (see the pt1=tail,pt2-head comment next to LINE). Both axes choices I drew are right-handed Commented Jul 29, 2018 at 9:43