Severi Salminen <sev### [at] notthissaunalahtifiinvalid> wrote:
> And this is the code I use:


>     double x,y,z;

>     do{
>         x = 2.0 * rNG.randomNumberClosed() - 1.0;
>         z = 2.0 * rNG.randomNumberClosed() - 1.0;
>     }
>     while(x*x + z*z > 1.0);

>     y = sqrt(1.0 - (x*x + z*z));


> There you have it: a random vector inside a hemishere.

  You still have to rotate it so that the hemisphere is tangential to
the surface. Probably requires multiplication with a matrix.

-- 
                                                          - Warp

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