Re: [Plib-users] why there is a jerk

[Curtis L. O. <cur...@fl...>]

Hemalatha Sharma wrote:

>  
> Hi Everybody,
>
> I am using flightgear-0.9.4 version.
> While takeoff and landing(when aircraft is near runway) i am able to 
> feel jerk.The fps is about 10 when aircraft is near runway.
>
> Then on flight whenever the new set of tiles are loaded jerk was there.
>
> How to eliminate this problem.
> plz..... give your views.
>
I think this may have been asked about recently, but I believe as of v0.9.4 the threaded tile loader was not enabled by default.  In more recent versions the threaded tile loader is the default.  Loading tiles in a separate thread doesn't completely eliminate all frame rate stutter when crossing tile boundaries, but it really helps minimize the problem.  I'm not sure why you are observing a hesitation when the aircraft is near the runway ... unless this is also a situation where you are crossing a tile boundary (note that tile boundaries can pass through the center of airports.)

So, you could try recompiling v0.9.4 with the threaded tile loader enabled.  Or you could try upgrading to a newer version (the most recent released version is v0.9.9.)

Upgrading your hardware may help.  A scsi disk may help (since it can do data transfers with minimal cpu involvement unlike IDE.)  A multi-cpu system might help in conjunction with ide/threaded tile loader because the tile loader could run on the 2nd cpu while the 1st cpu handled the main render thread.

Regards,

Curt.

-- 
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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