In article <web.3d44b783314cfd0118ccf4f70@news.povray.org>,
 "Rohan Bernett" <rox### [at] yahoocom> wrote:

> I know the IORs of water and glass are 1.33 and 1.5, but there are a number
> of materials that it would be handy to know the IORs for.
> 
> Perspex
> PET (plastic, recycling number 1)
> Pyrex
> Quartz glass
> 
> If anyone can give the IORs of these substances (and any others) please
> reply to this message with them.

Look in consts.inc. Perspex is plexiglass, at 1.5. Polyethylene isn't in 
there, I'd guess at around 1.2. Pyrex isn't in there either, but I'd 
guess at somewhere from 1.5-1.6. Quartz glass is there, at 1.458.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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Rohan Bernett wrote:
>I know the IORs of water and glass are 1.33 and 1.5, but there are a number
>of materials that it would be handy to know the IORs for.
>
>Perspex
>PET (plastic, recycling number 1)
>Pyrex
>Quartz glass
>
>If anyone can give the IORs of these substances (and any others) please
>reply to this message with them.
>
>Rohan _e_ii
>


Try
http://matweb.com
I have found it useful for general material specs.
Below is what I found for quartz.
Fused Quartz = 1.46
Fused Quartz Lamp tubing = 1.458
Alpha Quartz  1.544, 1.553

There is a Beta  Quartz but it looks like God released that version
prematurely as it doesn't have usefull optical qualities :).
Tony

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"Tony LaVigne" <ton### [at] xenomechanicscom> wrote in
news:web.3d46ed6085bddebcc7e287770@news.povray.org 

> There is a Beta  Quartz but it looks like God released that version
> prematurely as it doesn't have usefull optical qualities :).

how about a... bug report ;) ?

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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