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Chris Maryan wrote:
>
> A while ago I saw someone mention using dispersion with the photon patch
> on one of the povray NGs. My newsreader (NS) is configured to delete all
> headers more than a few days old and I can no longer find this message.
> I need to know the syntax for adding dispersion to an object.
>
> Any help would be appreciated, thanks.
>
> --
> Chris Maryan
Nathan Kopp replied to my quwry with the following:
...I have implemented dispersion, but there's no default spectrum.
If you creat your light source like this:
light_source { <10,10,10>
color <1,1,1> // this will be replaced, but the parser is a hack right
// now, so it is still required
color_map{ // here you define your light's spectrum
// this color_map acts like "average": the first value is
// weight (intensity), the second is color
[1, <.5,0,0>]
[1, <.2,.2,0>]
[1, <.3,.3,0>]
[1, <0,.5,.5>]
[1, <0,0,.5>]
}
}
Notice, the color map entries added up to <1,1,1>. This spectrum will
probably look bad (I made it up just now), but you get the idea.
------------
Good luck,
--
Ken Tyler
mailto://tylereng@pacbell.net
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Just a note, I tried it and got an error.
Adding 'rgb' in front of the colour vectors in the color_map fixed the
problem. Well at least I think it did, I no longer get a parser error
but my scene has no visible dispersion. However, this may be due to the
design of my scene rather than a complete failure of the dispersion
feature.
I'm going to play around with the scene and see what happens.
--
Chris Maryan
mailto:cma### [at] geocities com
***
Will work for cash.
***
Email me if you are interested in donating
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We will also accept donations to the Chris
needs a Pentium III or SGI workstation
fund and the Chris needs a car fund.
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Hi Chris,
I am one of the folks playing with dispersion in the photon patch - I
posted a picture or two showing the effect. Looking back in the scene
files ng I can't see that I got around to posting any source. Well, I'll
post the source to a slightly modified version of the 'Photon Crystal'
picture I made.
Bye for now,
Mike Andrews.
Chris Maryan wrote:
>
> A while ago I saw someone mention using dispersion with the photon patch
> on one of the povray NGs. My newsreader (NS) is configured to delete all
> headers more than a few days old and I can no longer find this message.
> I need to know the syntax for adding dispersion to an object.
>
> Any help would be appreciated, thanks.
>
> --
> Chris Maryan
> mailto:cma### [at] geocitiescom
> ***
> Will work for cash.
> ***
> Email me if you are interested in donating
> to the Chris Maryan needs money fund.
> We will also accept donations to the Chris
> needs a Pentium III or SGI workstation
> fund and the Chris needs a car fund.
Post a reply to this message
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Sorry 'bout that... that's what I get for posting code that I just make
up without testing it first.
BTW, I now have a macro that will automatically create a nice color_map
spectrum given a number of elements. It will be with the next release
of UVPov. Make sure to put the 'dispersion' keyword in your object
just like you do for Daren's dispersion.
-Nathan
Chris Maryan wrote:
>
> Just a note, I tried it and got an error.
> Adding 'rgb' in front of the colour vectors in the color_map fixed the
> problem. Well at least I think it did, I no longer get a parser error
> but my scene has no visible dispersion. However, this may be due to the
> design of my scene rather than a complete failure of the dispersion
> feature.
>
> I'm going to play around with the scene and see what happens.
>
> --
> Chris Maryan
> mailto:cma### [at] geocitiescom
> ***
> Will work for cash.
> ***
> Email me if you are interested in donating
> to the Chris Maryan needs money fund.
> We will also accept donations to the Chris
> needs a Pentium III or SGI workstation
> fund and the Chris needs a car fund.
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