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I really need help solving a problem

D

DaleRFU

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39
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england
Hi all,

im hoping that there are people here who have had this problem and have managed to solve it. It's something that bugs the hell out of me and kind of dampens my flying experience.

what it is, is the AI traffic (air and sea) all judder back and forwards whenever they move regardless of what it is or where it is. In an attempt to try and solve it I turned my settings sliders down for everything and yet still no luck i still get the judders. I also get it with FSRecorder when ever I am the flying as the third aircraft (having flown the previous two) and also when I playback using FSRecorder with only two aircraft in (the AI one judders). It makes it hugely frustrating and I hope you can help me here I'm all out of ideas.

Cheers,
Dale
 
Dale, It seems you are not alone with AI traffic that moves less smoothly than expected. I am hoping you can be a little more descriptive before I hazard a guess. I understand you say this happens regardless of what or where. You write that you experience it, "when ever I am the flying as the third aircraft (having flown the previous two)." It sounds like you are formation flying, is that correct? In order to test the hypothesis, I'd need you to be stationary when you observe an AI aircraft, can you do that? Perhaps start a formation flight and then pause or slew your aircraft so it stops moving. I'd need to know if the jerkiness continues while you are not moving in relation to the AI plane, if you are able to tell.
 
Hi Rick,

That's correct I tend to formation fly with FSRecorder. I did what you suggested, I flew a formation of two aircraft and it was fine no judders, once I finished with the two I played back the flight using FSRecorder. It played back as the second aircraft in the formation and the lead aircraft juddered back and forward like mad. I then played as a third aircraft, and what do you know the first (lead) aircraft juddered back and forth like mad. As you suggested I both paused and slewed myself. When I slewed myself I stopped and the other two aircraft continued, the lead aircraft continued to judder and the second aircraft didn't. I then finished the recording and saved it so that all three aircraft are in one recorded file. I then played it back and now the first two aircraft judder like mad. I have no idea what's going on.
 
Is your framerate slider set to unlimited? Try bringing it down.
 
Frame rate might be a good buffer. What is happening is a synchronization issue, so you would want to reduce your frame rate to match the refresh rate of the AI traffic:
russell said:
Now... I remember a while back, Joel DeYoung was telling me that if you're flying next to an AI plane there's a bit of an optical illusion happening. The AI plane is completely still, but then it hops forward every 25 ms. If your plane is flying next to it, then in the time between 25 ms updates, your plane is moving forward but the AI plane is still, so it appears as though the AI plane is moving backwards. Then the AI plane hops forward again at the next 25 ms update. What you end up seeing is the plane drifting smoothly backwards, then jumping forwards, then drifting back, jumping forwards, over and over. Did you notice that all the jumping around was only forward-backward? There was hardly any side-to-side jumping. But if you pause your plane, or if you're sitting on the ground watching the AI plane, then there's no optical illusion and the movement is smooth.

So why doesn't it happen in FS9? Because when we create AI planes in FS9 we tell the AI plane to start moving in a particular direction, and then give it updates every once in a while. But in between updates, the AI plane keeps moving on its own. It's exactly how the multiplayer system works in FS9 -- each plane tells everyone else their current location, heading, velocity, etc., and then the other players draw an AI plane there, and FS9 keeps it moving automatically until it gets a new velocity packet. This isn't possible in FSX, so we have to use slew mode and hop the AI plane forward a step at a time. And I think that's what's causing the optical illusion, and the jumping around.
Click to expand...
http://www.fsdeveloper.com/forum/threads/ai-planes-with-smooth-movement-possible.9240/

You can peruse the thread, but they didn't find an answer. I could not find the original quote by Joel DeYoung, but he definitely appears to be an authority on AI movement with informed posts on the subject from way back in the day.
 
Off the top of my head I think that my frame rate is set to 45. I'll have a look tonight and adjust accordingly and see what happens. I'll let you know if that has worked.

Cheers
 
Anything as long as it isn't set to unlimited. I usually use 33.
 
I've done some tests and it appears that as long as it's below 40fps I don't get the jurks so it seems to be sorted. Thanks guys
 
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