Looking for 'Affect Shadows'

Hey Guys,

I am making a factory building where I have to show the roof as transparent so that the client can see the different pipes/a.c layout in the building…when I make the roof transparent…it gets real dark inside…I read somewhere on this forum that after checking ‘Affect Shadows’, I can get rid of this issue…Can somebody please tell me where can I find this option??..Do I need to put a direct light in the scene to get rid of this??..Any tips & tricks are welcome…thx in advance

Go to the VRayMtl and under refraction you see “fog color” and “affect shadows”. Put checkmark there.
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thx Ad…appreciate that…

cheers