Durk Talsma wrote:
On Tuesday 22 March 2005 04:54, Jon Elson wrote:10 MINUTES? Gee, it seems to me it was more frequently than that. I have to admit,
The astronomical objects used to be updated once every 10 minutes and the whole celestial spere is rotated on a frame to frame basis.Any ideas? I thought maybe the C172 needs fuel mixture
adjustments??? The regularity of this is uncanny!
I *think* this is the Astro component of FlightGear updating the positions of objects in the sky. The time discontinuity is probably responsible for the pitch changes. (Although it shouldn't have that effect.) What speed CPU do you have?
I have not upgraded to 0.9.8 yet. (It is such a hassle, or used to be, to get everything
working just right, I'm kind of gun-shy about changing something that does, mostly, work.)
At least it used to be like this. The scheduling may have changed, as I haven't looked at the code in ages. Updating the position of the celestial is done within a few microseconds or so, so I would find it hard to believe that this causes any discontinuities. Just out of curiousity, Jon what made you assume that the astronomical code was causing the discontinuity?I may be thinking of the scenery loading rather than the astro update. I know there
was something that caused frequent, periodic interruptions in the real-time flow
of the simulation. Getting a better video card with lots of texture memory and
a faster CPU with more main memory has made these stutters almost undetectable.
Sometimes, if you are at a high altitude and make a 180 degree turn the scenery
loading still slows the sim down, but recent FGFS versions spread the load over time
to make it a lot less objectionable.
I don't remember the scenery loading to be periodic, though. That's why I was thinking of the
astro, but maybe it was texture loading that was responsible for the stutters I saw on
an older version on the old computer.
Jon
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