In article <37ee4053@news.povray.org> , "Thorsten Froehlich" 
<tho### [at] trfde> wrote:
> M = <V.x, 0, V.z>
>
> r = vlength(M);
>
> g = asin(M.z / r)

Ups, acos of course - sorry!


    Thorsten


____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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