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This question already has an answer here:

I have attached a screen shot of no light passing through the window. The light strength is high, and the glass material I think is good. Why is there not a pinch of light passing or traveling inside the room. In the image the window glass is all black. What is missing in my nodes, so that light can travel inside the room? enter image description here enter image description here enter image description here

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marked as duplicate by Duarte Farrajota Ramos, cegaton, p2or, Denis, someonewithpc Jan 17 '17 at 20:32

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    $\begingroup$ The glass shader has to be modified to let light through. Read: blender.stackexchange.com/questions/2558/… $\endgroup$ – cegaton Jan 17 '17 at 17:59
  • $\begingroup$ @cegaton u mean the addon archimesh im using material is of no use. I have to change the glass material $\endgroup$ – atek Jan 17 '17 at 18:05
  • $\begingroup$ yes, change the glass material. You need to mix a glass shader and a transparent shader controlled by light paths blender.stackexchange.com/a/47875/1853 $\endgroup$ – cegaton Jan 17 '17 at 18:07
  • $\begingroup$ i have applied the material still not get the result blender.stackexchange.com/questions/71654/… $\endgroup$ – atek Jan 18 '17 at 17:47
  • $\begingroup$ Please do not post the same question twice. $\endgroup$ – cegaton Jan 18 '17 at 18:11
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You have to add a bit to the glass shader to make light pass through it, like it would through a window. Try using this node setup, works really well for architectural glass: png

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  • $\begingroup$ Thanks for the reply in the node where the Add came im mean which shader $\endgroup$ – atek Jan 17 '17 at 18:32
  • $\begingroup$ sorry to disturb you in the add as you said mixRGB in image it show value and im getting color $\endgroup$ – atek Jan 17 '17 at 18:43
  • $\begingroup$ Oh my bad, it's actually the math node you're supposed to use, just connect the light paths in the value inputs. $\endgroup$ – Wiirexu Jan 17 '17 at 18:47
  • $\begingroup$ i have applied the material still not get the result blender.stackexchange.com/questions/71654/… $\endgroup$ – atek Jan 18 '17 at 17:47

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