> I take 3 random angles and I rotate my point around all 3 axes with 
> these angles.
> 
>     #local a1=360*rand(MySeed);
>     #local a2=360*rand(MySeed);
>     #local a3=360*rand(MySeed);
>     #local InitPos = vrotate (<10,0,0>, <a1,a2,a3>);
>     #local Pos=trace (Terrain, 0, InitPos, Norm);

	This link may help:
	http://www.math.niu.edu/~rusin/known-math/96/sph.rand

	Methods for generating uniformly-distributed points on
	a unit sphere

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