Re: [Flightgear-users] Network Control of FG
On Thu, Mar 24, 2005 at 03:24:01PM -0500, Jeff McBride wrote: I am looking into the possibility of using FlightGear as a simulator to test flight control software that I am developing for a UAV (Unmanned Aerial Vehicle) project. The idea is that I will take control values (ailerons, throttle, etc) from the telemetry link and pass them to FG, then take the resulting location, speed, etc. from FG and pass it back to the UAV as if it were coming from the on-board GPS. Sorry for the delayed response, I just noticed this thread yesterday and wanted to talk to my employer before posting ... We have had a similar setup working in our lab for over six monthes. It is a hardware-in-the-loop simulation for testing our UAV hardware and adaptive autopilot. I am hoping to get a paper out in late Summer (at AIAA's [EMAIL PROTECTED]) which will cover the details. I'll provide an overview below. If anyone is interested in more details, let me know. From what I can tell, FG has support for this kind of thing, but no documentation of it. So, my question for the experts is what is the best way to do this? I was going to try to use the generic network interface, but as far as I can tell it doesn't support a bi-directional link. Perhaps I can run two of these (one in, one out), but is there a better way I should be looking at? There seem to be a lot of options. Our hardware, an embedded computer running Linux, interfaces with sensors and acuators via a serial port. We wrote a small briding application which reads the data from FlightGear using the native I/O (FGNetFDM and FGNetCtrls) and translates the data to the same format as produced by the sensors (i.e. the bridging application generates NMEA GPS packets). As mentioned in the thread, the code is setup to read all available data from the sockets and throw away all but the latest packet. Once everything is initialized, we can operate easily at 50Hz sending and receiving a single packet to FG within the timeslice. The controls packet contains quite a few fields and, in addition to the expected aileron, elevator, rudder, and throttle, a few others are required. I'd have to dig back through our code to see what we set if you are interested. All of the information you need to simulate your sensors should be in the FDM packet; be careful with the units. Of course, my next problem will be creating a model of the plane I am flying, but I am waiting until I get there to tackle that one. Creating the model was definately the hardest task. During initial testing, we used the models available in Flightgear, mainly the Cub, as it was one of the slowest flying airplanes. We have since developed a working JSBSim model of our R/C sized aircraft. We should have some flight test data in the next month which we will be able to compare to FlightGear to gauge how accurate our model is. Hope the information proved useful and as I mentioned above, if anyone is interested in additional details, please let me know. Eric -- Eric F. Sorton [EMAIL PROTECTED] ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] problem in sending control data across the OS
On Fri, Mar 25, 2005 at 05:33:47PM +0900, ? Keeyoung Choi wrote: I have a problem in sending control data from FG running on Windows (or Linux) to another FG on Linux (or Windows). If I use UDP, the data are not transferred at all. For TCP/IP, the data are scrambled. I don't have any problem in exchanging the fdm data between the OS's. Anyone have tried this? Thanks in advance. I tried this almost a year ago and experienced similar results. I fixed my problem by replacing Windows with Linux :-) Eric -- Eric F. Sorton [EMAIL PROTECTED] ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Rotating the Display
On Fri, Mar 11, 2005 at 04:34:43PM +, Jon Stockill wrote: Sorry to jump back to an ancient thread - but if you're using an nvidia card, there's a new driver out today - and you may be interested in Appendix W of the readme. It now supports the xrandr extension: I'm not sure if I'd consider 2+ weeks ancient even in Internet time ... old maybe, but not ancient :-) APPENDIX W: THE XRANDR X EXTENSION __ X.org version X11R6.8.1 contains support for the rotation component of the XRandR extension. This allows screens to be rotated at 90 degree increments. The driver supports rotation with the extension when 'Option RandRRotation' is enabled in the X config file. Workstation RGB or CI overlay visuals will function at lower performance when RandRRotation is enabled. The video overlay is not available when RandRRotation is enabled. Thanks for the info. I'll look into it. I was still hoping to find a way to rotate the screen without using the X driver. The system I'm running FG on isn't your typical PC. The official flight simulator installed on the system doesn't require the X display to be rotated. FG is more of a side project that can't disturb the official simulator, thus, I'm a bit limited on what I can do to the systems. Thanks for the help, Eric -- Eric F. Sorton [EMAIL PROTECTED] ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Rotating the Display
On Wed, Feb 23, 2005 at 08:43:45AM -, Richard Bytheway wrote: If you are using a nVidia card on Windows, then the latest drivers support rotation of the screen at the driver level. The Linux driver may also do this, and I would hope that ATI would provide similar functionality. I am using nVidia under Linux. I do believe that the nVidia drivers under Linux allow you to rotate the display, however, my past research showed that hardware acceleration is disabled after the rotation. This makes it useless for FlightGear. I am not sure if the same issue exists under Windows. If anyone is rotating the display under Linux through the nVidia drivers with hardware acceleration, I'd love to hear how they do it. Thanks for the info, Eric -- Eric F. Sorton [EMAIL PROTECTED] ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Rotating the Display
On Wed, Feb 23, 2005 at 03:12:12PM +0100, Arnt Karlsen wrote: ..this has been supported natiively for years in X11R6 (XFree86, X.org etc ) for at least all Linux distros (and I guess all Unix too) I'm aware of, chk out Option Rotate string in ' man fbdev ' for details. A quick search on Google turned up the following link: http://www.nvidia.com/object/linux_readme_install.html [...] (app-d) APPENDIX D: XF86Config OPTIONS [...] Option Rotate CW Option Rotate CCW Rotate the display clockwise or counterclockwise. This mode forces NoAccel and SWCursor to both be TRUE. Default: no rotation. [...] The date at the top is May 14, 2001; a bit old. I checked the latest README installed with 6111 (the latest version I have handy), and it does not mention the rotate option. Can anyone confirm or deny that the hardware acceleration under NVIDIA works with the hardware acceleration option? I'd prefer to find a solution that does not involve mucking with the X config if possible. Any other suggestions are appreciated, Eric -- Eric F. Sorton [EMAIL PROTECTED] ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
[Flightgear-users] Rotating the Display
Hi All, Is there a way to rotate the display 90 degrees? My monitor projects an image 90. I've played with /sim/current-view/roll-offset-deg. It does rotate the display, but something isn't quite right. All is OK if the plane is sitting still, but once you start to move, the view changes. Any suggestions would be greatly appreciated, Eric -- Eric F. Sorton [EMAIL PROTECTED] ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
