Matthew Green wrote:
> 
> I want to create a ring of random width made of randomly spaced particles.
> What I get is random particles within a square boundary.  I've stared at
> this for 45 minutes now.  Where am I screwing up?

I see you already found the answer to your problem. However I think you could
cut out much of the trig stuff by using POV's built-in vector functions;
v_rotate() in particular seems to do exactly what you need, or perhaps
vaxis_rotate()

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg
Home page http://www.hot.ee/margusrt

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