Hello everybody,
After doing a complete build of the flightgear-0.9.3 source under Cygwin, the simulation runs near perfect. However on two machines (one AMD XP, one P4 XP) with a Radeon 9700 card, fog is incorrectly rendered. Only cloud and ground polygons change gradualy to a white color when visibilty is decreased. The "fogwall" is not there however. The same build on an ATI mobility graphics chip does render fog correctly.
We've had similar reports on NVidia hardware and got around it with a hack. But I recently discovered what might go wrong.
In the sky callback (postdraw and predraw functions) the fog is set and unset without pushing and popping it sometimes.
I guess that might result in problems like this.
Erik
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