Luminance simulation - Albedo/horizon settings

[Knaken]

Hello. I'm having a problem with simulating illuminance/luminance. The IESRadiance software simulates the outside surface below the horizon, but it seems to be way too dark.



The horizon is almost as dark as the inside of the window frame.
To make a comparison, I added a rectangular surface at ground level outside the window. It has a green reflectance of 0.25 to simulate grass.
Walls have 0.65, Ceiling has 0.9 and floor has 0.25.
Sky is CIE overcast

How can I change the settings of the albedo/horizon so that it reflects light better?

[PCully]

Hi,

If you want to control the reflection from the ground plane you could draw a base on the model and apply the surface properties to this. e.g. draw a prism 1 metre thick from z = -1 to 0 (assuming your model starts at zero height).

Hope this helps you get the analysis you are looking for,

Phil

[Knaken]

Yes, that is what i did in the picture above (Notice the green plane outside). Sadly, it looks unnatural having a dark horizon directly above it. For presentation reasons, it might raise confusion in the audience.

Can I conclude that it's not possible to change the settings for the horizon background?