Daniel Schwen wrote:
> 
> > A real hologram? Then it is not onion patterns regardless of
> > appearance.
> You're right, I just use the onion pattern to determine the phase phi(i) of
> point source i, but then add the fields vectorial (plus reference light)
> sum(sin(phi(i)))^2+sum(cos(phi(i)))^2
> That only works for holograms of discrete point sources (glowing dots). For
> that I already need sizes of abt. 8000x8000 pixels to see the pattern.
> 
> > If you want to create a hologram of an image they you have to calculate
> > the phase interference sum at each point of the image of the rays from
> > all parts of the image. For an image of 1000 pixels that is 1000 phase
> > dependent rays per pixel.
> Right, that would be nice, but again, to get reasonable results the
> resolution must be much higher, and for a b times b pixel picture that's a
> b^4 order problem. It would thke months to render.
> 
> > They can only be calculated correctly for a
> > single color, monochromatic light.
> That is true in any case. I'm trying to create a transmissive hologram by
> taking a picture of my printed picture on bw film. That shrinks the size
> considerably and gives me a nice diffracting high resolution pattern, which
> I can aim my HeNe laser at.

	I am lost here. We are singing from the same hymnal. We agree it is a
huge task. We agree POVray can't do it. 

	Where are we going with this? 

-- 
Bill Clinton is sterile and Hillary has a daughter. 
Put three and three together for the unfaithful bitch.
     -- The Iron Webmaster, 11

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