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  • $\begingroup$ I got several ParametricPlot3D::nlnum and Visualization`Core`ParametricPlot3D::invfuncs errors when using it. It happens when all three Δ* values are set. Here's a case when this happens: {opacity = 1, Δθ = 1, Δρ = 1, Δφ = 1, θ = 0, ρ = 1, φ = 0}. I haven't looked through the code to see where or why this occurs, but it'll be quicker for you to find it $\endgroup$ Commented Jan 8, 2013 at 22:31
  • $\begingroup$ @Hypnotoad Thanks, but when I use your settings I get no messages. Random moving generates no messages either. Perhaps something global was defined in your session? $\endgroup$ Commented Jan 8, 2013 at 22:50
  • $\begingroup$ Clean session, I'm also getting errors same as Hypnotoad. Also, if this is used in any sort of teaching setting, I would advice cleaning it up to improve readability. $\endgroup$ Commented Jan 8, 2013 at 23:02
  • $\begingroup$ Same here. I get the errors as soon as I change any of the Δ... $\endgroup$ Commented Jan 9, 2013 at 0:14
  • $\begingroup$ Thanks everyone for checking it out. Sorry that it's so long - I thought I could just paste an old thing. @jVincent: By readability, do you mean the code, the output, or both? $\endgroup$ Commented Jan 9, 2013 at 0:20