Ron Parker wrote:
>...
> You want atan2(vlength(vcross(A-B,C-B)),vdot(A-B,C-B)).

Yes, that's one way of doing it.


He could also try this:
acos(vdot(vnormalize(A-B),vnormalize(C-B)))

or even:
asin(vlength(vcross(vnormalize(A-B),vnormalize(C-B))))

But I would suspect POV to parse your expression faster.
Is this true Ron ?


-- 
Best regards,

Tor Olav

mailto:tor### [at] hotmailcom
http://hjem.sol.no/t-o-k
http://www.crosswinds.net/~tok

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