Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote in 
news:Xns### [at] 204213191226:

> [...]
> Note that in this expression:
> [...]

Wow, thanks for the great advice and explanations.  I did figure out that 
the (c?a:b) was evaluating both expressions and the AxAn() divide error, 
sorry to have you go through my code as well, I should have just taken a 
moment to figured those out earlier.

Thanks for your other suggestions (variables, epsilon, code, etc.), much 
appreciated,  I will use most of them.  I'm adding a few more rotation 
macros and will revise all of my variables names.

As for the log() in the Qln(), it's operating on the scalar, and I'm pretty 
sure that's what it should be, but don't make me explain quaternions I 
still don't quite understand them.

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