I have a tube diagram. The tube is made from a spreadsheet of X, Y and
Z columns by N rows. So row 0 is time zero and row N is time last. There
are thousands of rows. The result looks like a tight ball of string.

I'd like to see into that ball of string by highlighting a subset of rows.
I think the best way would be to have the whole thing semi-transparent and
the segment of interest to be opaque (as the whole is colored by magnitude).

Would it be possible to set a scale to change the opacity of 5 segments
starting at some position determined by the scale? That way as I changed
the scale, the opaque section of the tube could worm its way along through
the whole mess until the end, calling attentnion to each part along the way.

That would be perfect. My current tube shows 3D well. But time is very hard
to distinguish. Changing the opacity thus would give the appearance of time
unfolding. To put it another way, it would be as if my tube were a really
long and involved flex-straw, and the segment of interest colored liquid
within. Blow into one end and the colored section moves through the tube
calling attention to whichever section it happend to be in.

Anyone know of an example for how to do something like that?

TIA,

Gan

--

 Mistera Sturno - Rarest Extinct Bird

 <(+)__       Gan Uesli Starling
  ((__/)=-    Kalamazoo, MI, USA
   `||`
    ++        http://starling.us

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