Enable fog and snowfall outdoors but prevent the effects in indoor spaces without disabling the effects..

  1. I want to achieve the effect of seeing fog and snowfall outdoors through a window, while ensuring that these effects do not appear indoors.

  2. The FX device for snow sometimes doesn’t appear indoors which is exactly what I’m wanting but there doesn’t appear to be any consistency. Some areas with a roof prevent the snow effect while other roofs have no effect. This happens even when the roof or floor tile are exactly the same.