Julian Foad writes:
> Apologies - it looks pretty good as it is, both in sunlight and at
> night, now that I see it as intended - i.e. very feint, so the
> colouring of it is not too important.  In fact, the light grey
> colour of it looks like a highlight reflection off the blades.  The
> only situation in which it goes wrong is in an external view, it
> cuts out the cloud texture (so it looks like a solid grey disc) -
> but ground textures show through it perfectly, and both ground and
> clouds show through properly in the pilot's eye view. 
> 
> Is there a way to make the prop fade out and the disc fade in as RPM
> changes?  Something like <animation type="transparency"> ?  I tried
> making the propeller material transparent in the .ac file, and that
> works except that behind a transparent propeller blade, the clouds
> and some parts of the airframe disappear (engine cowling, tail fin,
> ...) while the rest remains (seats, wings, ...).  Yet behind the
> disc, the whole of the airframe is OK and only the clouds
> disappear. 

In other systems, I've seen something implimented called 'fade level
of detail'.  It's a pretty nifty thing.  They idea is that instead of
popping from one LOD to the next, you blend from one to the next over
a distance using a transparency applied to one LOD and (1 -
transparency) applied to the other.  It would take some thought to
impliment well ... especially if the models have transparent
components.  But, if people have implimented it already, it may not be
that hard to do ...

Curt.
-- 
Curtis Olson   IVLab / HumanFIRST Program       FlightGear Project
Twin Cities    [EMAIL PROTECTED]                  [EMAIL PROTECTED]
Minnesota      http://www.menet.umn.edu/~curt   http://www.flightgear.org

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