[Radiance-general] AUTOREPLY Radiance-general Digest, Vol 118, Issue 1

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Today's Topics:

   1. question transmission an reflection glass (Sierd Tilma)
   2. Re: question transmission an reflection glass (Lars O. Grobe)
   3. Re: question transmission an reflection glass (Greg Ward)
   4. question transmission an reflection glass (Sierd Tilma)


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Message: 1
Date: Wed, 4 Dec 2013 17:00:44 +0100
From: Sierd Tilma <S.Tilma at lbpsight.nl>
To: "radiance-general at radiance-online.org"
	<radiance-general at radiance-online.org>
Subject: [Radiance-general] question transmission an reflection glass
Message-ID: <DEDD0469611DBA43B5A212C1473FDC2A50C1BEDA17 at es02>
Content-Type: text/plain; charset="us-ascii"

Dear members,

I have a question about glass.
Is it possible, and if the answer is yes, how can I make a glass definition with transmission en reflection properties

Now I make only glas whit transmission properties as below

void glass glasname
0
0
3             0.596 0.654 0.654

Kind regards,
Sierd Tilma

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Message: 2
Date: Wed, 04 Dec 2013 21:19:41 +0100
From: "Lars O. Grobe" <grobe at gmx.net>
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] question transmission an reflection
	glass
Message-ID: <529F8E5D.5010000 at gmx.net>
Content-Type: text/plain; charset=ISO-8859-1

Hi Sierd!

> I have a question about glass.
> 
> Is it possible, and if the answer is yes, how can I make a glass
> definition with transmission en reflection properties
> Now I make only glas whit transmission properties as below

The glass material is an optimization for thin, clear glass panes.
Transmission through such glass, which depends on the material, is
expected when you define a glass material in Radiance, can be measured.
Reflection is - for an ideal, flat glass - a property of only the angle
between surface normal and ray and the transmission (as a fraction of
light is reflected from the second surface, which means it has to travel
2 times through the material).

So for all use cases that the glass model in Radiance was implemented
for, you would not need the reflection to be defined.

Cheers, Lars.



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Message: 3
Date: Wed, 4 Dec 2013 12:29:10 -0800
From: Greg Ward <gregoryjward at gmail.com>
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] question transmission an reflection
	glass
Message-ID: <123550DF-4A71-4A52-8682-004704BFD007 at lmi.net>
Content-Type: text/plain; charset="us-ascii"

The glass material assumes an uncoated dielectric material, thus its reflectance and transmittance as a function of incident angle are precisely determined by physics from the normal transmissivity (which you specify) and the index of refraction (which you can also give but defaults to 1.52).

If you want finer control over reflectance separate from transmittance, you should use the "trans" material type, although accounting for the angular dependence is more difficult with this type.  Try the "glaze" script if you have a multi-pane system you wish to model.

Best,
-Greg

> From: Sierd Tilma <S.Tilma at lbpsight.nl>
> Date: December 4, 2013 8:00:44 AM PST
> 
> Dear members,
>  
> I have a question about glass.
> Is it possible, and if the answer is yes, how can I make a glass definition with transmission en reflection properties
>  
> Now I make only glas whit transmission properties as below
>  
> void glass glasname
> 0
> 0
> 3             0.596 0.654 0.654
>  
> Kind regards,
> Sierd Tilma
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Message: 4
Date: Thu, 5 Dec 2013 09:38:33 +0100
From: "Sierd Tilma" <tilma.sierd at gmail.com>
To: <radiance-general at radiance-online.org>
Subject: [Radiance-general] question transmission an reflection glass
Message-ID: <52a03b8b.01dc0e0a.0ec0.65fe at mx.google.com>
Content-Type: text/plain; charset="us-ascii"

Dear members,

 

I have a question about glass.

Is it possible, and if the answer is yes, how can I make a glass definition
with transmission en reflection properties

 

Now I make only glas whit transmission properties as below

 

void glass glasname

0

0

3             0.596 0.654 0.654

 

Kind regards,

Sierd Tilma

 

 

 

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