That would not be needed: when you are flying trough water laden clouds your A/C is not really glistening 1) because most of the water is running fast 2) because you need some specular reflection to see glistening and in a cloud that would be more like diffuse, and not that much.
The same would go for flying across rain out of the clouds (no not all clouds have rain in them, far from it...but if the temperature is right most of them will have some ice in it, and this is where the fun begins (and sometimes, ends fast enough).
Now like you say it would be quite formidable to see rain and its effects rendered; what do we need:
- rain as showers seen from afar: the kind of whitish diffuse "bands" falling down the clouds (in this case cumulus, especially for you!)
- rain as British drizzle, on the ground:
1) loss of visibility a bit like haze except that the sky will be in many nuances of gray, depending of cloud thickness and regularity
2) a certain increase in color saturation (the "wet landscape" effect) which will be really visible mainly if sunlight comes back: otherwise the lack of light typical of rainy days will not make it as obvious but it should be there (no dusty film everywhere when it rains!)
3) puddles in the proper places, and if possible some falling water from roofs or A/C surfaces...
4) glistening of surfaces like wings, roofs, cars, etc to represent the water layer
4) at close range a representation of more or less driving rain
- rain in the air
1) loss of visibility if out of the clouds
2) increase in ambient noise
3) some representation of fast running rivulets on front glass and lateral glass (for a computer screen it will resemble white/gray 1 or 2 pixel segments all over the lateral and front surfaces, changing position and length randomly
4) The BoP representation of rain is grossly overdone: rain is water, not glycerin, and not all clouds have rain...
All of that is technically quite possible I think, but is linked to weather representation, and may have an impact on the FPS...
And we did not talk about snow yet (granted, during BoB we can live without it)
JV
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