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   The name of the program - RonchiZ - is simply a hangover for the file names I originally used which designated    Ronchi patterns with Zones as opposed to normal Ronchi patterns.  It's as good a name as any.
 
 

When the downloaded file is unzipped, you should see a directory structure consisting of the main directory RonchiZ  and two sub directories of data called \Test and \Shape attached to it.
 

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For the program to work properly It is important that :-

1.   Screen Size MUST BE set to  1024 X 768.  The program should be rewritten to avoid this limitation but it's not going to happen in the immediate future.

2.   The Program is placed in directory  C:\RonchiZ  which has the two sub directories   C:\RonchiZ\Shape  and   C:\RonchiZ\Test  hanging from it.

3.   When the program is started, click the centre of the screen to activate plotting of Ronchi Patterns.

4.   Read the section on 'Getting Started'.  This will allow you to quickly recover if rediculous data is entered.

5.   As needed, read each help item as indicated by the  ?  sign.

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This Program has some limitations and sometimes shows strange screendisplays on some systems but nearly every machine I have run it on gives flawless display.  This is frustrating, but reassuring to know because  if you have trouble it is worth perservering.
 

To the best of my knowledge, the predicted patterns are accurate except for one quite minor detail which will have almost no practical effect.  Sometime I want to search out a cause for this small discrepency but it will have   to wait.  In general, there is excellent agreement with Ronchi patterns and Strehl generated using Zemax for   deformed surfaces. I am sure there are other bugs but they seem to be quite minor and don't seem to impact the   accuracy of results.
 

The program was originally developed for myself over a period of 2 - 3 years.  Some of the modules were originally   written for another program.  The main aim was to rigorously investigate the relationship between Ronchi patterns and   deformed surfaces.  It was never originally intended for public consumption and extra facilities were added to   investigate other aspects.  Thus, when modules ran well enough for my own purposes, I moved on to other things.    Despite its unpolished aspects and some bugs, it is, I believe, rather unique in seven main ways.
 

 (A)  The mouse interface gives instant feedback (especially on a fast machine) which almost gives one the feel  of controlling the grating position by actually sliding it forward and backward.  This gives users incentive to      quickly try 'what if' situations.

 (B)  Immediate control over the lateral position of the grating is also included.  Thus the user can investigate the  effect of scanning the grating across the mirror - again with instant  feedback.

 (c)  Variations such as Single wire, 2D gratings, Horizontal/Vertical, Odd/Even are included.

 (D)  Line centres may be plotted.  There are some surprises here and it helped me to explain certain anomolies        met when using another of my programs - RonchiEstimates.

 (E)  Zone shapes may be impressed onto any conic.  These shapes may be saved seperately so they can be reused.   The zone shape may be inverted and shrunk or expanded at will.  The mirror shape is drawn using the mouse   via clamped cubic splines and again there is instant feedback.  Drawing very smooth shapes requires care  and it could be improved but is useable.  These zones may be set to any maximum PV deviation in waves as you like.

 (F)  A plot of surface shape (referred to the target conic) AND surface slopes is always displayed.

 (G)  Assuming the target is a Paraboloid, the distorted shape may be analysed for Strehl and conic of best fit.   This can be repeated with user defined zones masked off from the  inner and outer portions of the mirror.
 

All in all, I have learned a lot from writing and playing with this program.  I hope others will also find it useful,   instructive, and pleasant - almost compulsive - to use.
 

 One immediate function I see is its use by an instructor in mirror making classes.
 

I also think it may be a good starting point for others who are far more capable them I am in programming to    consider future directions for this type of program.
 

       Peter Smith.
 

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