Secondary source of distant illumination not working with spectral radiation text file

[Tomáš Hanousek]

Dear DART team,

I am trying to simulate our laboratory spectral measurements of spruce shoots. As it was indoor I want to use spectral radiation text file as light definition.
In lab we had a setup of four lamps above the shoot which I setup using Spot Light in Secondary source of distant illumination option (I disable sun illumination). Than I set Solar illumination text file and run the simulation. But the results for each sensor are completely black. I try it with default sunIrradiance.txt file but results are also black.

 

After that I try it with Spectral irradiance database (Solar_constant.db) and it works. Also if I don't set up Secondary source and use my Solar illumination text file as Sun it works, but the results don't match the measured spectra (mising shadows from four lights).

I am attaching whole simulation to this conversation and I would be grateful for any advice how to make the secondary illumination work.

https://drive.google.com/file/d/1j4LnHLDcAXFYlmNOhu5B-Kqm4l19nctQ/view?usp=sharing

Best regards,

Tomáš Hanousek