Ok, thanks, Zom-B

thanks, but if no reflections : no realism ?

Just checked : I used th Bidirectionnal Path thracing in Indigo. No Mlt

I think I will try to improve the level of SPP in the rendering farm, just to be sure.
But it's expensive !

both glass canopy material are the same in this renders

thanks for your answer : yes I used indigo MDB glass material.

What do you mean by architectural glass ?
What is MLT ?

the images where rendered with Ranch Computing render farm

it is quite strange : I show you this previously rendered image with a limit of only 15 000 sample per pixels, wich was perfect.
On the other hand the HDRI image is not the same.

hello, can you tel me how to fix the problem of stains that appear on windows in my render ? It's seems to happen in the dark parts of the scene, where are shadows... this image was rendered with 20 000 samples per pixels. I think more samples would be better, but I'm not sure. Thanks for your sugge...

Hello,
what version do you use ?

hello, I'm new in the forum, and live in France, that is why please forgive me for my aproximative english.... I need to know how to fix the path file problem when I re-install indigo and sketchup in windows 10 on my PC : I had to do this these days... my sketchup project is in a directory that I ha...