Editing FlightGear (section)

===== Precipitation and accumulation rendering =====
''FlightGear'' is able to render rain falling from specific clouds in rain volumes containing the correct droplet size to determine the properties like thickness and intensity of rainbows.<ref name=":022" /><ref name=":32"/><ref name=":2" /> Perceptual phenomena like rain streaks are rendered with streak length shortening as time is slowed. Rain and water spray streaks on canopy glass provides cues to the relative air flow, while frost and fog with correct light scattering provide cues to temperature.<ref>{{Cite web|last=|first=|date=December 7, 2015|title=The new Cessna 172p – FlightGear Flight Simulator|url=https://www.flightgear.org/tours/the-new-cessna-172p/|url-status=live|archive-url=https://web.archive.org/web/20201205093411/https://www.flightgear.org/tours/the-new-cessna-172p/|archive-date=5 December 2020|access-date=2019-08-31|website=FlightGear.org|language=en-US}}</ref><ref name=":1" /><ref name=":2" />

''FlightGear'' is able to render specified historical accumulation levels of water and snow accounting for flatness on the surfaces of for both terrain and buildings. This provides cues to surface moisture or friction, and weather driven by surface heating that reduces with snow thickness. ''FlightGear'' can render gradual snow and ice cover on inland and ocean water.<ref name=":022" /><ref name=":2" />