To have that effect you have to use volumetric fog. It’s not going to look the same as the God Rays effect since that is not physically based, so you may just not be getting the results you expect. Most likely you need to mess with the settings, particularly the quality settings for the volumetric fog to increase the resolution. It could also be that the volumetric effect is accurate and but the objects aren’t actually placed in a way to produce the effect you were wanting.
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