Starting with a box I want to take away some parts of it, the one after
the other (using the difference of the box and the union of the parts,
at each step one part more). After each step I want to save the
resulting image. I suppose it can be done using an animation. But how
can I count the steps in the animation? 
Or: does "clock" get a numerical value if one knows that clock varies
from 0 to 1 and that the number of images in the animation should be ex.
11).
-- 
Herman Serras
Gent (Belgium)
http://cage.rug.ac.be/~hs/

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