Big black Circle

[pnel77]

I'm animating this building (import from sketchup) - Glass material show this big black circle in reflections (some faces of the glass material are way more reflective than the material applied and that's where this huge black circle is appearing)

Glass material: Black diffuse, Falloff map in Reflection, grey fog multiplier

What could the problem be?

[vlado]

It could happen if the faces on these objects are flipped.

Best regards,
Vlado