OK, OK nice discussion... but the original question was about POV ray as a
plugin for 3dstudio max. Forget about it. I just read the 3d studio
newsgroup and guess what: Mental Ray 2 will be available for Max 3 pretty
soon, so I guess I won't need POV then. (except for the money-issue).
Thanks for the reactions
Jobbert

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Oh... I stand corrected (I thought it wasn't possible to accurately messure
the IOR of a solid object because it is affected by the way in which the
original surface has been manufactured...)

--
Lance.


---
For the latest 3D Studio MAX plug-ins, images and much more, go to:
The Zone - http://come.to/the.zone
For a totally different experience, visit my Chroma Key Website:
Colorblind - http://www.fortunecity.com/skyscraper/parallax/359/colorblind

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Lance Birch wrote:
> 
> Oh... I stand corrected (I thought it wasn't possible to accurately messure
> the IOR of a solid object because it is affected by the way in which the
> original surface has been manufactured...)
> 
> --
> Lance.

  What we have here is a Ying and Yang, white and black, yes an no, north
and south, and live or die. You mentioned that it is not possible to accuratly
measure the incident angle of of reflection which prompted me to reply as I did.
Now you are back on the subject of measuring the ior values of non refractive
materials again. Let's pick one subject, discuss it, then move to the next in
turn so we both know what the heck we are replying to.

P.S. I checked a list a couple of hours ago that listed the ior values of over
170 different materials and not one of those listed was a common metal type.
All were related in some way to crystaline structures and materials. i.e.
quartz, glass, silicon carbide, salt, etc...

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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Yes, sorry about that... I was actually talking about not being able to
measure the IOR of a non-refractive solid very easily...

(because it kinds of depends on the overall light interaction... for
example, crystaline substances)

Sorry about the misunderstanding there!!!  (typical of me, you know that, I
always seem to complicate things in one way or another... ;-)

--
Lance.


---
For the latest 3D Studio MAX plug-ins, images and much more, go to:
The Zone - http://come.to/the.zone
For a totally different experience, visit my Chroma Key Website:
Colorblind - http://www.fortunecity.com/skyscraper/parallax/359/colorblind

Ken wrote in message <371735DE.99018A4D@pacbell.net>...
>Lance Birch wrote:
>>
>> Oh... I stand corrected (I thought it wasn't possible to accurately
messure
>> the IOR of a solid object because it is affected by the way in which the
>> original surface has been manufactured...)
>>
>> --
>> Lance.
>
>  What we have here is a Ying and Yang, white and black, yes an no, north
>and south, and live or die. You mentioned that it is not possible to
accuratly
>measure the incident angle of of reflection which prompted me to reply as I
did.
>Now you are back on the subject of measuring the ior values of non
refractive
>materials again. Let's pick one subject, discuss it, then move to the next
in
>turn so we both know what the heck we are replying to.
>
>P.S. I checked a list a couple of hours ago that listed the ior values of
over
>170 different materials and not one of those listed was a common metal
type.
>All were related in some way to crystaline structures and materials. i.e.
>quartz, glass, silicon carbide, salt, etc...
>
>--
>Ken Tyler
>
>mailto://tylereng@pacbell.net

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Hmm, is that list avaiable somewhere? I was thinking in the lines of a include
file. It might come in handy somewhere.





Ken wrote:
> 
> Lance Birch wrote:
> >
> > Oh... I stand corrected (I thought it wasn't possible to accurately messure
> > the IOR of a solid object because it is affected by the way in which the
> > original surface has been manufactured...)
> >
> > --
> > Lance.
> 
>   What we have here is a Ying and Yang, white and black, yes an no, north
> and south, and live or die. You mentioned that it is not possible to accuratly
> measure the incident angle of of reflection which prompted me to reply as I did.
> Now you are back on the subject of measuring the ior values of non refractive
> materials again. Let's pick one subject, discuss it, then move to the next in
> turn so we both know what the heck we are replying to.
> 
> P.S. I checked a list a couple of hours ago that listed the ior values of over
> 170 different materials and not one of those listed was a common metal type.
> All were related in some way to crystaline structures and materials. i.e.
> quartz, glass, silicon carbide, salt, etc...
> 
> --
> Ken Tyler
> 
> mailto://tylereng@pacbell.net

-- 
//Spider
        [ spi### [at] bahnhofse ]-[ http://www.bahnhof.se/~spider/ ]
What I can do and what I could do, I just don't know anymore
                "Marian"
        By: "Sisters Of Mercy"

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Spider wrote:
> 
> Hmm, is that list avaiable somewhere? I was thinking in the lines of a include
> file. It might come in handy somewhere.

povray.text.scene-files posted in two minutes

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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On Fri, 16 Apr 1999 16:41:32 +0200, Spider <spi### [at] bahnhofse> wrote:
>Hmm, is that list avaiable somewhere? I was thinking in the lines of a include
>file. It might come in handy somewhere.

I don't know about that list, but you can find many (though not 170!) common 
IORs at http://www.is.kiruna.se/~cjo/d2i/REFRACTION.INDEX3.html

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Ron Parker wrote:
> 
> On Fri, 16 Apr 1999 16:41:32 +0200, Spider <spi### [at] bahnhofse> wrote:
> >Hmm, is that list avaiable somewhere? I was thinking in the lines of a include
> >file. It might come in handy somewhere.
> 
> I don't know about that list, but you can find many (though not 170!) common
> IORs at http://www.is.kiruna.se/~cjo/d2i/REFRACTION.INDEX3.html

I must moment a take to admit that my left handed lysdexia slaugh me in a clight
tis mruth. The list had only 117 entries and not the 170 I boasted earlier.

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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whopp whoppa...

Thanx !
(something for the pov-release.)

Ken wrote:
> 
> Spider wrote:
> >
> > Hmm, is that list avaiable somewhere? I was thinking in the lines of a include
> > file. It might come in handy somewhere.
> 
> povray.text.scene-files posted in two minutes
> 
> --
> Ken Tyler
> 
> mailto://tylereng@pacbell.net

-- 
//Spider
        [ spi### [at] bahnhofse ]-[ http://www.bahnhof.se/~spider/ ]
What I can do and what I could do, I just don't know anymore
                "Marian"
        By: "Sisters Of Mercy"

Post a reply to this message

Ken wrote:

> P.S. I checked a list a couple of hours ago that listed the ior values of over
> 170 different materials and not one of those listed was a common metal type.
> All were related in some way to crystaline structures and materials. i.e.
> quartz, glass, silicon carbide, salt, etc...

Depends on the literature. Long ago (when I was doing optics
in waveguides) we had tables with the IOR of copper, silicon,
aluminum etc.
It is relevant to know them e.g. for microscopic inspection
of ICs (the layers there are sometimes so thin that metals
have to be considered transparent).

AFAIK most of them have rather high IORs (I remember values about 
3 .. 4 for silicon) with even higher imaginary parts (which
are *very* relevant). The dispersion is also much higher than
for ordinary transparent media (many semiconductors are almost
transparent in the near IR).

Fresnels formulas gave pretty realistic colors for them using
a simple RGB model with the central wavelengths of the three colors.

Whilst this might be useless for raytracing metals, it might help
for stuff with similar behavios but much smaller imaginary part,
e.g. eosine (which is red in transmitted (and therefore diffusely
reflected) light, but green in properly reflected light (i.e.
"reflection","phong", and "specular" in POV).

Ralf

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