I've got a scene where a sun is shining through a couple of windows:
I want to make it so that there is a light ray effect between the windows and where the light hits, like this: 
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Josh Silveous
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7Related https://blender.stackexchange.com/questions/33150/create-light-rays-in-cycles?rq=1 and https://blender.stackexchange.com/questions/12218/how-to-make-sunbeams-in-blender – palkonimo Dec 07 '16 at 21:20
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Research volumetric lighting – 10 Replies Dec 07 '16 at 22:11
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@JoshSilveous I don't know why the question has been marked as duplicate, given that the linked duplicates are not all the issues you are having. You can't do volumetric lights with a sun light (read: http://blender.stackexchange.com/questions/68668/volumetric-lighting-is-not-working/68671#68671) Then you need to modify the glass material so that light can actually travel through the glass material you have on the window. See:http://blender.stackexchange.com/questions/47851/how-can-i-make-a-more-realistic-glass-shader – Dec 08 '16 at 04:39
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Also related: http://blender.stackexchange.com/questions/68410/light-rays-through-glass/68426#68426 and http://blender.stackexchange.com/questions/38830/volumetric-spot-light-with-cycles/38833#38833 – Dec 08 '16 at 04:42
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Then you have two choices to do volumetrics either add volume scattering as volume on the world, or enclose your object into a mesh that uses volume scattering. See: http://blender.stackexchange.com/questions/45153/atmospheric-lighting-in-cycles/45154#45154 and http://blender.stackexchange.com/questions/49893/rendering-environment-pass-without-combined-pass-in-cycles/49923#49923 – Dec 08 '16 at 04:45
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A very bright spot light, a simple cube around the scene with some volume scattering, a modified shader for the glass: https://i.stack.imgur.com/IX41A.png – Dec 08 '16 at 06:02
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@cegaton You can do volumetric lighting with sun lamps, you just need to use a mesh volume, not world volumetrics. – JakeD Dec 08 '16 at 15:36
