[Radiance-general] glass modifier under different angles

[Thomas Bleicher]

I remember from some documents (maybe even RwR) that
'glass' is optimised to model the effects of a thin
sheet of glass in one single polygon rather than
two parallel 'interface' polygons. The thickness of
glass panes in buildings is rather standard (4 or 6
mm) so there should be minimal errors due to this
optimisation.

If you want to model exactly how a solid body of
glass would behave you should use other primitives
like 'dielectric' (see the whale sculpture and
anti-matter examples in RwR). Arguably, the Radiance
approach is not the best algorithm for this.


Regards,
Thomas



On 14 Jan 2009, at 05:41, Lars Oliver Grobe wrote:

> Hi,
>
> I have one question about the glass modifier.
>
> Transmittance depends on both the materials properties and the  
> distance
> that light is traveling through the material. This distance depends on
> the angle under which the ray hits the surface, and will be  
> shortest if
> hit perpendicular. Is this correctly modeled by the glass modifier,
> which does not know the thickness (but the refraction of the  
> material)?
> Or do I need a 'solid' glass body to model this, with dielectric?
>
> CU Lars.
>
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