[Radiance-general] Materials definition

[Lars O. Grobe]

Hi Virginie!

> In addition, I have seen that there is another way to define glazing,
> with the glass definition. What is the difference between these two
> definitions of materials? What is the simplest way to define a typical
> single glazing? There may be a library with examples of glazing that I
> could use?

The trans material is for translucent materials. Getting its parameters
defined is rather complex and one of the frequently asked questions.

For a typical, clear glazing, glass is the option you should use! It is
an approximation, as not a solid glass volume is considered but the
glass pane is approximated as a zero-thickness pane of given transmissivity.

If you do not have manufacturer data available, download the optics tool
from lbnl, which takes values of the international glazing database
(igdb) to set up your glazing made of glass panes, coatings, air gaps.
This tool will offer an export option to Radiance, which will be a glass
definition for a typical clear glazing.

Cheers, Lars.