I have read the Povray documentation, searching it's abilities. I was
unhappy
when I found out that Povray does not use dispersion but just some 'fake
caustics'.
First, I did not found nothing more about 'fake caustics' - I mean what
exactly and wow it does.
Second, does anyone here know some tool which REALY simulate dispersion?

        Thank You

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["Kosina.Josef" <kos### [at] felcvutcz>]
| when I found out that Povray does not use dispersion but just some 'fake
| caustics'. First, I did not found nothing more about 'fake caustics' 
| - I mean what exactly and wow it does.
| Second, does anyone here know some tool which REALY simulate dispersion?

You're mixing terms here. Caustics are the bright spots you get behind 
a transparent object due to the focusing of refracted light, or the 
bright spots in front of a refracting object. 

Dispersion has to do with how different frequencies of light is
refracted differently. E.g. How a prism can split white light into all the
colors of the rainbow.

POV-Ray has a form of fake caustics, but can also do "real" caustics
(since POV-Ray v3.5) through the use of photon-maps. Also, real dispersion
effects can be added to photon-map effects, but the computational cost
is high. 

If you download the newest POV-Ray several scenes demonstrating
the use of photon maps are included.

--  
It's a dark day for mad science.

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I dont mind high computational cost since I need simulate
dispersion as real as possible. So photon maps are the stuff I need to see,
thanks.




news:oat### [at] tvaifiuiono...
> ["Kosina.Josef" <kos### [at] felcvutcz>]
> | when I found out that Povray does not use dispersion but just some 'fake
> | caustics'. First, I did not found nothing more about 'fake caustics'
> | - I mean what exactly and wow it does.
> | Second, does anyone here know some tool which REALY simulate dispersion?
>
> You're mixing terms here. Caustics are the bright spots you get behind
> a transparent object due to the focusing of refracted light, or the
> bright spots in front of a refracting object.
>
> Dispersion has to do with how different frequencies of light is
> refracted differently. E.g. How a prism can split white light into all the
> colors of the rainbow.
>
> POV-Ray has a form of fake caustics, but can also do "real" caustics
> (since POV-Ray v3.5) through the use of photon-maps. Also, real dispersion
> effects can be added to photon-map effects, but the computational cost
> is high.
>
> If you download the newest POV-Ray several scenes demonstrating
> the use of photon maps are included.
>
> --
> It's a dark day for mad science.

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news:oat### [at] tvaifiuiono...

> --
> It's a dark day for mad science.

LOL - where's that from?

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["Tom Melly" <tom### [at] tomandlucouk>]
| > --
| > It's a dark day for mad science.
| 
| LOL - where's that from?

It's from "Day of the Tentacle", an old Lucasarts adventure game.

-- 
It's a dark day for mad science.

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news:oat### [at] tvaifiuiono...
>
> It's from "Day of the Tentacle", an old Lucasarts adventure game.

Ah! Played it. V. funny. Weird time travel stuff iirc.

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