You could try to use a cube primative to create the atmospheric effect around the figure with Superfly and assign the volumetric material to create the fog effect, the trick is to set the anisotropic component of the volumetric node to point along the path of the light as by default the scatter node reflects light in all directions. My vector calculus is not good enough to provide an answer to this part so below is just an example.

Superfly is based on Cycles - there is a discussion on scattering in cycles here if it helps https://blenderdiplom.com/en/tutorials/all-tutorials/582-cycles-volume-scatter.html