I have been experimenting with media-based clouds using pigment functions.
After lots of playing, I think I've finally begin to understand the balance
between emitting, absorption, and scattering medias.  I've also found that
method 3 with 1 interval and a decent amount of samples seems to work the
best (in terms of speed/quality).

Images number 1 and 3 were the slowest, about (estimated) 17h and 24h on a
P4 2.66GHz machine running at 60% duty cycle.
Image 2 is much faster, about 4 hours on a P4 3.0 @ 3.5 running 100% duty
cycle
Originals were 800 x 600, except for 3 which was 1024x768

Still working on making thunderheads, I think I've found a way using the
cylindrical pattern and a few transforms...


                        Reactor

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Preview of image 'cloud_test2.jpg'

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