[Radiance-general] Modeling Question for Translucent Glass

[Thomas Bleicher]

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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