Another concept diagram, the principle of this little program. Each pixel on the
output image generates a "primary path" to calculate the scattering sun light
with many segments. then return the sum of them. the variable
'sky_light_primary_path_res' in the .pov is control the resolution of it.

If the 'calc_secondary_scatter' turn on, it will sampling secondary paths on
every segment of the primary path. then add the effect "sunlight --> skylight
--> skylight". It will much slower when you turn it on. But for a dense/thick
atmosphere it will make some difference.

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