"Jim Charter" <jrc### [at] msncom> wrote in message 
news:42da75dc$1@news.povray.org...
>
> Also I think it looks better, or at least closer to your example, with
> poly_wave set between 1 and 4.

I've tried it with poly_wave 1.8 and I see what you are saying about that.

> Yes Slow. My example rendered -aa in about 5 minutes.

It isn't slow enough to matter, I guess, if doing mainly a cratered 
planetoid anyway. In fact, I've tried it with 50 iterations for the first 
loop and 25 for the second and using default AA it was 3 minutes 50 seconds 
(on a 2GHz CPU here) to do the attached image.

> That you would use the idea or something similar to augment your texture
> was what I was thinking.  With a little less random, but rather more
> judicious application, you might get faster times and better effects.

I changed the average value to be rand(S), too, so it could have old and 
young craters mixed together. I'm thinking that to use this appropriately on 
irregular shapes, like those asteroids, it might be a good idea to try and 
match the surface normal using trace in some way. Something to think about 
anyhow, not sure I'll ever get around to it though.

Thanks a bunch for sharing this other way Jim.

Bob Hughes

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