"Jérôme M. Berger" wrote:

> -----BEGIN quantisedD MESSAGE-----
> Hash: SHA1
> 
> Daniel Matthews wrote:
> | Could an iso surface be used for the geometry of a Fresnel mirror?
> |
> If a fresnel mirror is similar in shape to a Fresnel lens, the
> answer is yes and no :) Take a look at my post titled "Fresnel
> isosurface" in p.b.i for the "yes" part. For the "no" part, the
> problem is that this function has an infinite gradient at places
> which causes the graininess of the picture and might cause additional
> problems with reflection/refraction.
> 
> Jerome
> 
> - --
> ******************************
> *      Jerome M. Berger      *
> * mailto:jbe### [at] ifrancecom *
> *  http://jeberger.free.fr/  *
> ******************************
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.2.2 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> 
> iD8DBQFAysbGqIYJdJhyixIRAoebAJ4ogsPvHCdfx58LoP6pL2TnknouYwCdEgpK
> PwgErJ9zyshA5RR7DLrGp7E=
> =P1tL
> -----END PGP SIGNATURE-----

I see what you mean, does it need to be quantised to avoid such problems?

My reading so far indicates that a zone plate pattern of two refraction
values will act as a lens, and will work in POV.
If such a flat lens is in contact with a mirror is should focus ans reflect?

Post a reply to this message