[ATM] Re: How to get "b" and surface figure from Texereau styledata points???

[J Killea <jkillea@yahoo.com>]

I might have answered part of my own question:
 
Just as wavefront deviation, from the target spherical wavefront, is calculated by Tex graphically as the "integral" of wavefront angular deviation as the zones go from #1 to #4, the surface figure angular deviation, relative to the target parabolic surface, should be 1/2 of the wavefront angular deviation.  This is since an angular tweak of the surface normal produces twice that tweak in the reflected ray.  So that at least will get me a very rough picture of the surface figure relative to the parabola.  I suppose that to get this relative to the sphere, I just need to add back the difference in surface height between the parab and the sphere.
 
Of course, this still doesn't answer my other question about calculating "b" from 4 Foucault test zones.
 
Jay

		
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