Hi.
I wonder why the Ground reflection in type 15-6 , input 4 and 5, doesn't seem to influence the diffuse part of the radiation? I have a surface with a 70? slope and the diffuse part of the radiation doesn't change when I change the ground reflection.
I have tried one case with extremely high reflection and one with no reflection without any difference in output.

Does anyone know the source of the problem?

Best regards
Richard Thygesen