[Radiance-general] Modeling Question for Translucent Glass

[Christopher Rush]

A thought about rendering as "invisible" ...
 
Nik, Is it invisible in any rendering, or only if you render an
illuminance image with the -i option?

________________________________

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of
Thomas Bleicher
Sent: Thursday, 12 June, 2008 6:03 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] Modeling Question for Translucent Glass



On 12 Jun 2008, at 17:50, Nikhil Kapur wrote:

	I am fairly new to Radiance and was trying to model a interior
translucent glazing


	void trans translucent panel

	0

	0

	7 1 1 1 0 0 0.5 0.2

One obvious error is the name 'translucent panel'. Identifiers can not
contain
spaces so it should be 'translucent_panel' or something like that.

The '1 1 1' looks odd to me. I don't think that's actually a physical
material.
I'd go for something like 0.8 for white.


	The second issue which I have not been able to figure out is how
to show this trans material inside the space in the final rendering in
Radiance as it is essentially invisible.

Think about it:
if it's 50% translucent it has to be visible (even glass with 50%
transmission would
show as a darker shade of the room behind it.) You're talking about
'white' so I assume
that you do want some amount of scattering of the light. In fact, the
material above
scatters 80% of the light that passes, so it would definitely be
visible.  

Just try a simple scene with a test cube and a bit of ground below and
use
the command 'objview' (Unix only) to see how the material works out.

Regards,
Thomas
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