To make snow weather fx:

First, creat a few textures:

Next, make a material: material for fluffing snow

Then, using the material to make Particlesystems: emitter for fluffing snow

Next, make PostEffect fog:

then, apply the post effect material in post Effects Editor

 

I learned: use Scene Depth to control the depth and fall off of the post effect fog.

(The SceneDepth expression is very similar to the DestDepth expression, but rather than calculating depth for a single pixel,

it samples depth across the entire level It has one parameter, bNormalize, which maps the values from the range of Near to Far to the range of 0 to 1.)

 

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