Class globals aircraft rain

rain
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Provides a property which can be used to control rain. Can be used to turn
off rain in internal views, and or used with a texture on canopies etc.
The output is co-ordinated with system precipitation:

/sim/model/rain/raining-norm  rain intensity
/sim/model/rain/flow-mps      drop flow speed [m/s]

See Hawker Seahawk for an example.

SYNOPSIS:
aircraft.rain.init();
aircraft.rain.update();