Re: [tech-3d] holographic 3d

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

>The technique of projecting with mirrors is as old as 4000 years (the Incas and
>the Olmecas). I did not think these new world civilisations were as old as this 
which is as old or older than anything in the old world and I thought the Olmecs were the oldest rather than the Incas but perhaps that was just in Central rather than South America
>http://www.geocities.com/Athens/Forum/3853/olm1e.html
>
I had a look at this site although I could not view the graphics properly with my my Netscaoe Navigator 2.02, I found it very interesting but was the original intention of the concave mirrors to project images or to focuss the suns rays to produce fire,as the name Tezcatlipoca ( smoking Mirror) suggests. Perhaps with a religious significance as the fire was taken directly from the sun, I have seen some other illustrations of these types of mirrors made from polished pyrite or iron sulphide FeS2 which can form naturaly in balls or discs consisting of radiating needle like crystals. Specular haematite can also form a miror like surface when polished,   

>Projecting on lenses is also interesting, it renders a floating image.
>The progress in this last years shoul be in increasing the field of view, wether
>using paraboloidal mirrors more specific that the Olmecas ones (as Peter Homer
>indicated)

P.J.Homer



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