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Add generic tyre smoke

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vmmeazza 2008-10-05 22:41:39 +00:00
parent eab70dccda
commit 16818db739
1 changed files with 77 additions and 0 deletions
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77
Nasal/aircraft.nas
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@ -988,4 +988,81 @@ _setlistener("/sim/signals/nasal-dir-initialized", func {
}
});
# tyre smoke
# =============================================================================
# Provides a property which can be used to contol particles used to simulate tyre
# smoke on landing. Weight on wheels, vertical speed, ground speed, ground friction factor
# are taken into account. Tyre slip is simulated be low pass filters.
#
# Modifications to the model file are required.
#
# Generic XML particle files are available, but are not mandatory
# (see Hawker Seahawk for an example).
#
# SYNOPSIS:
# aircraft.tyresmoke.new(<gear index>)
# <gear index> - the index of the gear to which the tyre smoke is attached
# aircraft.tyresmoke.update()
#
# EXAMPLE:
# var tyresmoke_0 = aircraft.tyresmoke.new(0);
# tyresmoke_0.update();
#
var tyresmoke = {
new : func (number,
){
var obj = {parents : [tyresmoke] };
m.name = "tyre-smoke " ~ number;
m.wow = props.globals.getNode("gear/gear[" ~ number ~"]/wow", 1);
m.tyresmoke = props.globals.getNode("gear/gear[" ~ number ~"]/tyre-smoke", 1);
m.tyresmoke.setBoolValue(0);
m.vertical_speed = props.globals.getNode("velocities/vertical-speed-fps", 1);
m.speed = props.globals.getNode("velocities/groundspeed-kt", 1);
m.friction_factor = props.globals.getNode("gear/gear[" ~ number ~"]/ground-friction-factor", 1);
m.friction_factor.setValue(1);
m.rollspeed = props.globals.getNode("gear/gear[" ~ number ~"]/rollspeed-ms", 1);
m.rollspeed.setValue(0);
m.lp = lowpass.new(2);
# print ("initialising ", obj.name," ", obj.tyresmoke.getValue());
return obj;
},
update: func { # set the smoke value according to the conditions
var vert_speed = me.vertical_speed.getValue();
var groundspeed = me.speed.getValue();
var friction_factor = me.friction_factor.getValue();
var wow = me.wow.getValue();
var rollspeed = me.rollspeed.getValue();
var filtered_rollspeed = me.lp.filter(me.rollspeed.getValue());
var diff_norm = 0;
# print (me.name, " rollspeed ", rollspeed, " filtered_rollspeed ",filtered_rollspeed);
var diff = math.abs(rollspeed - filtered_rollspeed);
if (diff > 0)
diff_norm = diff/rollspeed;
else
diff_norm = 0;
if (wow == nil or diff_norm == nil or rollspeed == nil)
return;
if (wow and vert_speed < -0.05 and diff_norm > 0.05
and friction_factor > 0.7 and groundspeed > 50){
me.tyresmoke.setValue(1);
}
else{
me.tyresmoke.setValue(0);
}
# print("updating ", me.name, " diff ", diff,
# " diff_norm ", diff_norm, " ", me.tyresmoke.getValue());
}, # end function
}; #