From: Ed Taychert 
To: atm{at}shore.net
CC: mdholm{at}telerama.com
Reply-To: Ed Taychert 


Hi Mark,

You say on your web page:

 > All of the older 9-point cell designs arranged the triangles as shown
in the first image below.
 > Plop also returns this arrangement for thicker mirrors. [...]

I think that this is more a function of the start-defaults of
"automatic cell design."

For example:

If you do an automatic design with D=200mm, th=25mm, fl= 1000mm, plop will
give you a 2.2 nanometer cell of the older type shown in the first image.

If you then change the thickness to 15 mm and "run" from the run
menu (w/o automatic cell design), the support point will flop over and
you'll get an example
of the "newer" second image of a cell.

If you then change the thickness back to 25 mm and run again, (again, from the
run menu) you will now get a 2.0 nanometer cell of the new type ...

... I don't think that plop really wants to make the older 9 point cells,
it's just that
its optimizer doesn't always let it get there.

 - Ed.

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