It took a while to figure out how to stop the snow (which 0901877 created) from falling through the guildhall and instead settle on the roof. I eventually discovered the Deflector tool. When this tool was linked to the snow generator, the particles reflected of it. In order to make them settle on top of it I had to reduce the bounce values in the deflector to zero and then also apply a gravity tool to the snow itself, so the particles would be pulled to the deflector. This however made all the snow in the scene drift one way so I had to create a replica of the snow generator and remove the gravity affects. This made the snow much more natural. Then I had it follow the outside camera so that it was always covered in snow. However because the camera was so close to the snow fall, and the way the snow tumbled, they occasionally drifted into shadow and became pitch black. So in order to stop this I created another omi light behind the camera and made it so it only affected the snow particle. This removed the back shadow effects on them quite effectively.
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