I'm trying to create a simple scene like the scene depicted in the answer here:
I reproduced the Compositor and Volume scatter settings, and this is what I get when I render:
But in the Rendered viewport, the scene looks somewhat closer to what I'm trying to do:
I've tried branched path tracing and path tracing, I tried rendering without Compositing enabled, tweaked various settings, and read many questions on Blender SE about light rays but can't seem to understand why it won't work...
Blend:




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Mar 14 '16 at 16:06