David Megginson wrote:
Currently, FlightGear (SimGear, actually) always sets visibility to near-nil when the plane is inside a cloud layer -- obviously, the right and proper solution is 3D clouds, but until we have that working, or at least until we can detect whether the plane is actually near the cloudy part of a texture, I suggest that we do not limit the visibility when the cloud coverage is under 50% (i.e. scattered, few, or clear).
It's a bit of a hack, but it does make it possible to fly VFR under conditions that are legal VFR -- it's quite normal for VFR pilots to climb through a scattered cloud layer, for example (our scattered texture might be a little too busy for realism, though). You should have everything go white when there are only a few clouds in the sky.
I'd like to commit this (very small) change. Are there any objections? It's especially useful with --enable-real-weather-fetch, where otherwise a low layer of few clouds gives you IMC right off the end of the runway.
Here's the complete summay:
clear: normal vis few: normal vis scattered: normal vis broken: low vis overcast: low vis cirrus: low vis
Thanks, and all the best,
One issue to consider is that going to nil visibility (and not drawing the cloud plane) hides when you pass through the "cloud plane". When the cloud plane intersects the near clip plane you get some ugly artifacts. I don't know how you get around this if you go to only partial visibility. I don't know if I'm willing to live with that artifact.
-- Curtis Olson http://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d
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