It is also important to end the clouds at the horizon!

To give some idea of the speed gain... My mountain tarn pic with grass and
flowers took 19 hrs to do 2/3  of the pic. With the changes it took 45 mins
to get to the same point!

Mick

Mick Hazelgrove <mha### [at] mindaswinternetcouk> wrote in message
news:382ecb9b@news.povray.org...
> A big speed up is possible by
>
> I. scaling the clouds to fit the picture frame as closely as possible
>
> 2. Using a box instead of a plane e.g.
>
>  box{<-10000,-0.0000001,-1000><100000,0.0,10000>
>
> Note the y values they are critical
>
> Mick
>
>

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