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Plane sinks into the ground

Postby mrwangyou » Thu Jun 02, 2022 9:44 am

Linux, FlightGear 2020.3.12, NVIDIA GeForce RTX 3090 (Another computer with RTX 2060 has the same problem).

Hi, I'm using FG "AppImage type" with linux and find the plane will sinks into the ground every time I turn on FG. This occurs with every aircraft I tried, which is f-16, c172 and 777-300. C172 is default aircraft when I download FG and F-16 models are download from FG website https://www.flightgear.org/download/download-aircraft/

I don't know how to upload the screenshot so I can't show the photograph of problems :(

Thank you for any suggestion :?:
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Re: Plane sinks into the ground

Postby Thorsten » Thu Jun 02, 2022 10:04 am

Is the ground water (aka, featureless and blue) ?
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Re: Plane sinks into the ground

Postby mrwangyou » Thu Jun 02, 2022 10:21 am

Thorsten wrote in Thu Jun 02, 2022 10:04 am:Is the ground water (aka, featureless and blue) ?

It's not water.
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Re: Plane sinks into the ground

Postby mrwangyou » Thu Jun 02, 2022 10:28 am

And I also want to ask: When I launch FG F-16 model with no arguments, Error "The element <max> must either contain a value number or a property name" will occur. Does anyone know the reasons? Thanks!
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Re: Plane sinks into the ground

Postby wkitty42 » Thu Jun 02, 2022 10:33 am

mrwangyou wrote in Thu Jun 02, 2022 10:21 am:
Thorsten wrote in Thu Jun 02, 2022 10:04 am:Is the ground water (aka, featureless and blue) ?

It's not water.

custom scenery?
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: Plane sinks into the ground

Postby Alant » Thu Jun 02, 2022 11:31 am

Is this at all airfields?
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Re: Plane sinks into the ground

Postby Thorsten » Thu Jun 02, 2022 12:59 pm

Does anyone know the reasons?


Wrongly defined tag in the JSBSim code. However that doesn't explain sinking.

I fear we need a screenshot after all - upload it somewhere to a host and link it here, they can't be uploaded in the forum.
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Re: Plane sinks into the ground

Postby TheEagle » Thu Jun 02, 2022 1:14 pm

@mrwangyou: go to https://imgbb.com, click Start uploading, upload your screenshot, select "Don't autodelete" in the combo box labeled "Auto delete image", then click Upload below. When it says "Upload completed", in the combo box labelled "Embed codes" select "BBCode full linked", then copy the code that appears below the combo in a code field. Finally, you can simply paste that code into a post here on the forum, click "Submit" and done ! :)
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Re: Plane sinks into the ground

Postby dilbert » Sat Jun 04, 2022 2:39 pm

The Imgur upload is easy to use. You copy the screenshot to your desktop. Once the Imgur Upload routine is in the browser, you can minimize it and drag the screenshot into the browser token. Thereafter, you can go to "images" and click on the pencil to select it; then, double click on the image, which will take you to the linkage menu. Choose Direct Link and copy and paste it to your Forum post. :)
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Re: Plane sinks into the ground

Postby mrwangyou » Sun Jun 05, 2022 3:33 am

Hi everyone,

Thank you all for your detailed reply. I'm sorry that I just read them just now. The screenshot is in https://ibb.co/VS0888D. I think maybe sinking is because of JSBSim I'm using, because when I delete all arguments in the right down of the screenshot, sinking will be solved.
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Re: Plane sinks into the ground

Postby Parnikkapore » Sun Jun 05, 2022 5:10 am

May I ask why you are using a JSBSim over the network? Most of the stuff in the right down of the screenshot aren't used on a regular basis.
There are free alternatives to (almost) every program you encounter. You just have to find them.
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Re: Plane sinks into the ground

Postby mrwangyou » Sun Jun 05, 2022 7:02 am

Parnikkapore wrote in Sun Jun 05, 2022 5:10 am:May I ask why you are using a JSBSim over the network? Most of the stuff in the right down of the screenshot aren't used on a regular basis.


I'm trying to design some intelligent dogfight system with JSBSim and FlightGear as visualization. Those arguments are copied from JSBSim Github page and FlightGear wiki
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Re: Plane sinks into the ground  

Postby Thorsten » Mon Jun 06, 2022 9:22 am

Well, if you use FG for visualization only, then

* terrain altitude in the visualization might not match what JSBSim knows
* the reference point of the animation might be offset
* things like gear compression might not be influencing the animation as they should
* ...

If you feed position from 'somewhere else' into FG there's no real reason all should match perfectly.
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