"Anders K." <and### [at] f2scom> wrote in message
news:3bcc53ab$1@news.povray.org...
> > When I try to find that according to the
> > formula mentioned in that section, "direction_length = 0.5 *
right_length
> /
> > tan(angle / 2) where right_length is the length of the right vector", I
> come
> > up with about 'direction 0.56' which is just more than half of what it
> ought
> > to be.
>
> Really? I come up with 1.00722346241. The exact value for angle is 2 atan
> (2/3), or about 67.38013502.

Right.  Well, apparently tan 67/2 isn't a good way to go about calculating
it.  I left off the parentheses in my quick attempt  :-)

Bob H.

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