This is the readme file for PlopSet.zip

The.zip file contains 44 individual files, including this one, and is 35,627 bytes long.  This version is dated June 4, 2005.

This .zip archive contains .gr files that are used to set up Plop for various cell configurations.  These files should be stored in two different folders on your computer.  With a typical Plop installation, these folders are:

C:\Program Files\Lewis\GuiPlop
and
C:\Program Files\Lewis\GuiPlop\autocell


Four files should go into C:\Program Files\Lewis\GuiPlop\autocell  They are:
cell_5_0_0.gr
cell_5_1_0.gr
cell_5_0_0.gr
cell_6_1_0.gr
Note:   As of Plop Version 2.1.6, June 2004, similar files are included in the Plop installation.  If you have that version, you won't need these files

These four files work with Plop's Automatic Cell Design feature.This feature includes, in recent versions, check boxes for 36 and 54 point cells, but the necessary files, for these options to work are not included.  These files allow the 36 and 54 point options to work.  These files were written by Jeff Anderson Lee.  They are not the only possible 36 and 54 point layouts, and may not be the best possible.
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Thirty eight files go into C:\Program Files\Lewis\GuiPlop  They are:

p12a.gr
p12b.gr
p12c.gr
p12d.gr
p12e.gr
p12f.gr
p12g.gr
p12h.gr
p12i.gr
p12j.gr
4point.gr
5point.gr
1+5.gr
1+6.gr
Dudgeon54point.gr
cell_36pts.gr
cell_7_1_0.gr
p18v.gr
p21v.gr
p21va.gr
p24v.gr
p27v.gr
p30.gr
p36.gr
p36v.gr
p36va.gr
p45.gr
p45v.gr
p54v.gr
p63v.gr
p72.gr
p72v.gr
p72va.gr
p81v.gr
p81va.gr
p108v.gr
p108va.gr
p162v.gr
p162va.gr

These files do not work with the Automatic Cell Design feature.  To load one of them, click the File, Open menu item and select the file you want.  You will need to enter your primary and secondary dimensions on the Mirror Size and Obstructions and Holes tabs.

p12a.gr through p12j.gr are 12-point layouts by Tom Krajci and Jeff Anderson Lee.  More about these is at http://pong.telerama.com/~mdholm/atm/cells/12PointCells/index.html

4point.gr and 5point.gr are one bar and two bar cells respectively.  They are essentially 6-point cells with two or one bars removed.  If you need more than 3 support points, but 6 looks like too much stuff behind the mirror, then give these a try.

5+1.gr and 6+1.gr are cells with one point at the center and five or six in a ring.  These designs were invented by Richard Schwartz.  He has a patent on them, but I understand that he happily allows atm's to use the designs for their personal projects without obligation.

Dudgeon54point.gr is a 54-point design by John Dudgeon.  This is different from the 54-point autocell designs by Jeff Anderson Lee.  John has used this design with a 30 inch by 1 inch mirror.

cell_7_1_0.gr  Although named like an autocell file, this one does not work with the Automatic Cell Design feature.  This is an 81 point layout by Jeff Anderson Lee.

p18v through p162va are designs by Jeff Anderson Lee.  Designs with v in the name use Plop's variable angles feature.  Designs without v do not.  Other letters indicate alternate layouts.  Read more about these cells at http://elib.cs.berkeley.edu/~jonah/18plus/

p24v is a 24 point cut down from the 27 point variable angle design that comes with Plop.  In some cases, the outer triangle of a 27 point cell gets pretty narrow.  This design replaces that triangle with a bar.  Narrow triangles are problematic from a construction tolerance point of view. This one looks good for the 20 - 26 inch range depending on thickness.

cell_36pts.gr is a 36 point design for an astatic cell by Hughes LaRoche.  This one will support a 1.138 meter diameter, 67 mm thick, BVC mirror.

Mark Holm
mdholm@telerama.com