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  • \$\begingroup\$ @Jitse I forgot to scale back the x and y at high values of z. Effectively the points defined a cylinder. It's fixed now but it cost a lot of bytes! I could save a few if the the output can be expressed with a complex number [z, x+yi] I'll leave it as it is unless you say that's OK. \$\endgroup\$ Commented Sep 9, 2019 at 9:58
  • \$\begingroup\$ Looks good! I really like this approach. For consistency, the required output is three floats, so I suggest leaving it like this. \$\endgroup\$ Commented Sep 9, 2019 at 10:09
  • \$\begingroup\$ Why not use z*z instead of z**2? \$\endgroup\$ Commented Sep 9, 2019 at 21:06
  • \$\begingroup\$ @ValueInk yeah thanks I realised I'd missed that z*z. I've edited it in now. The other thing I could do is replace rand*4 with something like z*99 or x*9E9 (effectively limiting the possible values to a very fine spiral on the sphere) but I think that reduces the quality of the random. \$\endgroup\$ Commented Sep 9, 2019 at 22:25