Here's a patch to model.cxx that restores the proper rotation speed of
the propeller spin.
It just replaces the single 1/60000 constant with one that is
(hopefully) more clearly derivable from basic principles. The
original number was off by a factor of 3/25; maybe something got
double-factored? One thing I didn't do is grab the 120 Hz update rate
from a real source; it's hardcoded instead. I forget where it comes
from.
For those wondering why I bothered working on this instead of the more
important stuff I'm supposed to be doing (flap drag bug in YASim
clickable virtual panel), I offer no excuse. It was low-hanging
fruit, and my other stuff is hard.
Andy
diff -u -r1.10 model.cxx
--- model.cxx 20 Apr 2002 15:07:47 -0000 1.10
+++ model.cxx 30 Apr 2002 23:17:55 -0000
@@ -527,8 +527,9 @@
void
FG3DModel::SpinAnimation::update (int dt)
{
- float velocity_rpms = (_prop->getDoubleValue() * _factor / 60000.0);
- _position_deg += (dt * velocity_rpms * 360);
+ float velocity_rpms = _prop->getDoubleValue() * _factor;
+ // 120Hz update, 60 sec/min, 360 degrees/revolution
+ _position_deg += (dt * (1/120.0) * (1/60.0) * velocity_rpms * 360);
while (_position_deg < 0)
_position_deg += 360.0;
while (_position_deg >= 360.0)
--
Andrew J. Ross NextBus Information Systems
Senior Software Engineer Emeryville, CA
[EMAIL PROTECTED] http://www.nextbus.com
"Men go crazy in conflagrations. They only get better one by one."
- Sting (misquoted)
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