I was able, with a few lines of nasal and moving the prop disc to it's
own model xml, to make the disc smoothly disapear as the rpm increases.
An added advantage is the disc is gone for the rotating AC at start up
in fgrun.
Nasal added to pa24-electrical.nas in the ammeter section:
##
# Save a factor used to make the prop disc disapear as rpm increases
##
factor = 1.0 - rpm/2400;
if ( factor < 0.0 ) {
factor = 0.0;
}
# outputs
setprop("/sim/models/materials/propdisc/factor", factor);
model xml that uses this factor:
<?xml version="1.0"?>
<PropertyList>
<path>fastprop.ac</path>
<animation>
<name>PropVisibility</name>
<type>material</type>
<object-name>FastpropDisc</object-name>
<transparency>
<alpha>0.2</alpha>
<factor-prop>/sim/models/materials/propdisc/factor</factor-prop>
</transparency>
</animation>
<animation>
<type>select</type>
<object-name>FastpropDisc</object-name>
<condition>
<greater-than>
<property>engines/engine[0]/rpm</property>
<value>350</value>
</greater-than>
</condition>
</animation>
</PropertyList>
The value <alpha>0.2</alpha> is very nearly the maximum that you see as
the rotating prop disappears and the prop disc appears. Then the disc
smoothly disappears as the rpm increases. The alpha goes to zero at
2400 rpm and the disc is just barely visible at the engine run-up rpm of
2000 (which is what I see with the real run-up). The prop disc is inot
visible for all cruise power and prop settings. At 15 in MP on downwind
the prop disc is not visible but becomes more visible as you retard the
throttle on base. Once you have full flaps, and increase the MP to 16
in to control the descent, the disc again disappears until you pull the
throttle for the flare out. Very realistic!
I will submit the patch tomorrow evening.
Dave Perry ;-)
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