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I need to render this scene where the sunlight is entering though the windows and making shadows, I added a spotlight but it seems that the light is only working outside, I have no idea why. My windows have no glass yet.

Of note, I am using 2.79 because of my current hardware.

enter image description here

I added a glass material to my windows to see if ti would help with the light but this weird circle came up!

Materials

The weird circle you see in the windows is that i accidentaly duplicated the glass, i deleted the duplicated faces and correct the normals and now everything is looking goood

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    $\begingroup$ the problem is your window material and the fact that it isnt transparent. Are you using alpha blend for the window material? I would also suggest rendering at those specific angles for your screenshots instead of just screenshotting a graining un-rendered preview. $\endgroup$ – object Apr 14 at 2:55
  • $\begingroup$ you should include screenshots of your settings or link your blend file so we can check it out $\endgroup$ – Chris Apr 14 at 5:29
  • $\begingroup$ it may have to do with light through glass? maybe the solution is to create a emissive plane or an area light at the windows position? $\endgroup$ – moonboots Apr 14 at 7:30
  • $\begingroup$ @object Hi, the windows has no material and no glass either. i was following a tutorial and the guy was doing it on blender 2.9 , he simple added a wall with holes and then the light, volume etc... aand the light was perfect and casting all the shadows of the windows's frame. i will try adding the glass mesh to the windows to see $\endgroup$ – wnr Apr 14 at 11:09
  • $\begingroup$ @Chris one thing i found out so far is that selecting the "non color data" inside the image texture node enlightens the wall when i choose sunlight $\endgroup$ – wnr Apr 14 at 11:57
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  1. change spot strength to 1000

  2. change glass material to : enter image description here

  3. and most important change these: (blend mode and shadow mode)

enter image description here

  1. and you will get :

enter image description here

to change blend mode in 2.79 checkout these answers:

Material Opacity in viewport?

How to see Cycle's material transparency in 3D View

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