I also tried this now
I downloaded Blender 2.79b, installed that plugin and directly imported and rendered one of my 12V train test scenes,
without adjusting any settings manually:
I very, very much like this default result.
Rendering time was 30 minutes.
LEGO logos were turned off by default.
I notice something strange going on at the roof slopes.
The reflection there looks somehow weird.
But still: an amazing result.
I downloaded Blender 2.79b, installed that plugin and directly imported and rendered one of my 12V train test scenes,
without adjusting any settings manually:
I very, very much like this default result.
Rendering time was 30 minutes.
LEGO logos were turned off by default.
I notice something strange going on at the roof slopes.
The reflection there looks somehow weird.
But still: an amazing result.