[Radiance-general] Fwd: radiance

[Thomas Bleicher]

On 27 Nov 2008, at 04:52, G V DEEPAK wrote:

> Also even though the illuminance levels are much higher (at the
> level of 4500 lux close to the window) there is no glare index
> observed (that is value of Daylight glare index DGI is equal to
> zero).

I've noticed that you have boxes ('tables') in your room that are
exactly the same height as your sample points (0.75m). Please
lift your sample points (or lower the desks) by a small amount
(0.01m is enough). When a point for rtrace calculation is located
on a surface (as in your case) the results are not predictable.

Raising the points slightly above the surface will not influence
your illuminance values but it will provide reliable results.

I'd say it is quite unusual to do an illuminance calculation with
a horizontal orientation directly on a surface. Effectively you are
blocking half of the hemisphere with your table surface. I would
run all the calculations without the desks in the scene to see if
that makes a difference.

Regards,
Thomas