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Hi Bob,
Do you know the value of tangent before all rotation?
If yes, you only need the same transform to this tangent and you get the new
value. (I'm not sure that it is true if scaling with non isotropic value,
for example <1,2,1>. What doe's news group think about this.).
Chaps.
"=Bob=" <bob### [at] threestrands com> wrote in message
news:3c893a29@news.povray.org...
> I'm afraid I just don't have the background to
> understand this yet. But I have need to know
> the angles for x,y and z of a tangent to a sphere
> that has been rotated on all axes. From what I
> have read, quaternions are the answer to this.
> Could someone point me to a way to implement
> this in Pov? Maybe someone has already made
> a set of macros?
>
> Thanks for all your kind help!
> =Bob=
>
>
>
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