On 29-Dec-08 23:58, Warp wrote:
> clipka <nomail@nomail> wrote:
>> So yes, that should do: A loop typically taking less than two iterations (the
>> most expensive part probably being the RNG) and a square root. Quite
>> inexpensive after all.
> 
>   When you project the point to the hemisphere, you'll probably need three
> multiplications and a square root. That's going to be much more expensive
> than the RNG. (High-quality RNGs are very fast. They are faster than a LCG,
> which consists of one integer multiplication and addition.)

but sin and cos are (much?) more costly than sqrt and multiplication is 
comparatively negligible.

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