Hi guys,
Thank you for you answers but I forgot to precise I did not apply any vray material on these windows. The glass is the "grey tanslucent glass" from sketchup. I like the blue reflection it makes, and don't want to use a vray glass.
WHAT THE HELL IS THIS REFLECTED SPHERE ?
As you can see in attachment, I made a whole facade with a copy of the window, and the sphere appears. Whatever if I zoom in or zoom out, the sphere keeps the same size on the image.
Also, but that' not the main problem, why can I see two shades of blue-sky reflection for a same material ? One is really blue, and the other one looks less saturated.
Thanks for the help !