Re: [Flightgear-devel] [Flightgear-commitlogs] FlightGear branch, next, updated. 26664aaff0e2f97db916909218d849b51636ccc0
On 29 Aug 2012, at 06:09, Flightgear-commitlogs wrote: - Log - commit 26664aaff0e2f97db916909218d849b51636ccc0 Author: Mathias Froehlich Date: Mon Aug 27 20:51:16 2012 +0200 Push SGMaterial use into these classes that need it. Nice work Mathias - much better decoupling of the AIModels from the scene. Thank you. James -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] feature request
On Tue, 28 Aug 2012 22:50:31 -0700 (PDT), Michael wrote in message 1346219431.79144.yahoomailclas...@web140204.mail.bf1.yahoo.com: http://www.kickstarter.com/projects/1523379957/oculus-rift-step-into-the-game I believe at the above link, they have some more complete with development sdk, but only for 3 more days? I'll wait for the final product, but yes this is for getting ready games. 3D glasses are very cool, but this will be huge. ..aye, meanwhile, there's prior art: ;o) http://hackaday.com/2009/10/27/head-mounted-computer-with-spit-bailing-wire/ http://www.popsci.com/gadgets/article/2009-10/cardboard-smartphone-sweet-diy-augmented-reality-googles ..using 2 cellphones, one for each eye, means resolution is 2x1280x800 if you use 2 Samsung Galaxy Note phones. 5.3in screens, each weighs 178 grammes. Or you can try 2 S3s: http://www.phonearena.com/reviews/Samsung-Galaxy-S-III-vs-Samsung-Galaxy-Note_id3045 ..with 2 screens, you probably want them mounted at an e.g 35 degree angle to keep the screen height the same around you. ..to move the cell phone screens really close, trim the box to size and play with e.g. 3+ glasses inside the safety goggles, until you have a nicely sized view. ..a good way to find the right strenght glasses, is hold the cell phone screen as close as you want it, you want to be able to see the horizon over the glasses and the cell phone screen thru the glasses at exactly the same time, _without_ wasting time refocusing, or _without_ squinting, you want your view _comfortable_ and _pleasant_, sacrifizing anything here merely adds to the pain when you e.g. crash fpv planes on eye fatigue. ..refocusing wastes a second or so, every time you refocus, not what you want when you e.g. try pick up an fpv plane for a rc-style landing. ..this augmented VR goggle rig idea also works in plexi glass boxes, just copy the marker idea below and look over the glasses to 'uncover' the plane. http://www.popsci.com/gadgets/article/2010-05/gadgets-timeline-mobile-augmented-reality-system ..the obvious next steps: http://diydrones.com/profiles/blogs/fpv-with-the-ar-drone-with-head-up-display http://www.theblaze.com/stories/google-reveals-design-for-virtual-reality-glasses-would-you-wear-them/ -- ..med vennlig hilsen = with Kind Regards from Arnt Karlsen ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[Flightgear-devel] Running Nasal at simulation rate
I know this has been brought up before, but it's been a while so I'll bring it up again. I have a need to run Nasal code at the same rate as the simulation. Currently, without modifying the source code for FlightGear, the only way to do this is to find a property updated at the right time in the simulation cycle and set a listener on it. From a code quality standpoint, this is less than ideal. There is a thread on the forums discussing this at http://flightgear.org/forums/viewtopic.php?f=46t=17069#p164697. In this thread, a couple of viable ideas are discussed. These ideas are: 1) Run a second events system and add an additional parameter to Nasal's settimer allowing you to use this new events system. Hooray has already created a patch for this (in the linked thread). 2) Add in a signal that is fired each simulation step, probably right before the Autopilot system is run. At this point, I am unsure which to pursue. Which method do you find to be better? Thank you, Johnathan Van Why -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] [Flightgear-commitlogs] FlightGear branch, next, updated. 26664aaff0e2f97db916909218d849b51636ccc0
Hi, On Wednesday, August 29, 2012 09:08:44 James Turner wrote: Nice work Mathias - much better decoupling of the AIModels from the scene. Thank you. Thanks, it was independent of what you started. It just originates from moving the bvh stuff to simgear core which could be solved like that ... Greetings Mathias -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Running Nasal at simulation rate
From: Johnathan Van Why jrvanwhy@gm... - 2012-08-29 13:20 I have a need to run Nasal code at the same rate as the simulation. At this point, I am unsure which to pursue. Which method do you find to be better? To be frank, the whole idea is just bad in the first place - so I vote for #3: avoid *any* Nasal in the fast simulation loop. Nasal execution is slow and non-deterministic. Running it in the fast simulation loop is the last thing we want. I know, some people on the forum would like to eventually replace fgfs(.exe) with nasal(.exe), because apparently everything is just better (tm) when implemented in Nasal (core = bad, nasal = good). But I really think this is a completely wrong direction - and harming the project. Concerning your original issue on implementing an autopilot: a much better way to do it is to avoid Nasal for the actual autopilot controller elements (numeric computation). Instead, use XML autopilot rules for the filter, gain, damper, integrator elements: http://wiki.flightgear.org/Autopilot_Configuration_Reference You can then use Nasal for the high level stuff, and enable/disable/switch the individual controller elements (e.g. in order to automatically switch the autopilot mode when capturing the ILS). There are some nice examples with fgdata/Git aircraft. You could look at the 777. This is also how such things are done in the real world: controllers aren't implemented in imperative programming languages these days - especially not in scripting languages. People use model-based design and connect controller elements - using graphical tools like MATLAB/Simulink. Obviously, FG is missing a graphical interface to specify the controller rules - but the idea of specifying through XML is the same and specification is straight forward. cheers, Thorsten -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Running Nasal at simulation rate
Concerning your original issue on implementing an autopilot: a much better way to do it is to avoid Nasal for the actual autopilot controller elements (numeric computation). Instead, use XML autopilot rules for the filter, gain, damper, integrator elements: http://wiki.flightgear.org/Autopilot_Configuration_Reference You can then use Nasal for the high level stuff, and enable/disable/switch the individual controller elements (e.g. in order to automatically switch the autopilot mode when capturing the ILS). There are some nice examples with fgdata/Git aircraft. You could look at the 777. This is also how such things are done in the real world: controllers aren't implemented in imperative programming languages these days - especially not in scripting languages. People use model-based design and connect controller elements - using graphical tools like MATLAB/Simulink. Obviously, FG is missing a graphical interface to specify the controller rules - but the idea of specifying through XML is the same and specification is straight forward. cheers, Thorsten I'd strongly agree with Thorsten here. It's nothing against Nasal from me - I've not even used it - but creating an autopilot (or any GNC or system model, for that matter) can be done very effectively with discrete objects such as summers, gains, controllers, filters, switches, etc., much as JSBSim has done with the system components. This is a standard approach in industry as Thorsten mentions as exemplified by Mathwork's $imulink product. Scilab/Scicos is similar in concept. Control system topologies are often diagrammed in a way that can lead to a one-to-one correspondence between a block and a control system object that can be referenced in an XML file, if the control system component library has been defined properly. This, again, is the way that JSBSim has approached the solution. Some benefits to such an approach include (IMHO) better testability, more predictability, and easier interface (someday) with a GUI tool, should one materialize. The downside is that XML can be verbose, but it's a price I've come to accept. Jon -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[Flightgear-devel] Gear transit times
Hi, Is it possible to specify gear up and down transit times for each gear? In real airplanes the gear never ( well rarely, maybe ) sequence in perfect unison. In reviewing the xml files for the 737, I note there are transit times defined for each flap position, but the kinematics for the gear is only a single value for up or down based on gear selection state. Is this something in Nasal? or native code or something in JSBsim? Thanks Jack - Original Message - -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Gear transit times
Jack, Check out the attached message from the JSBSim developer list. Jon From: castle...@comcast.net [mailto:castle...@comcast.net] Sent: Wednesday, August 29, 2012 7:52 PM To: FlightGear developers discussions Subject: [Flightgear-devel] Gear transit times Hi, Is it possible to specify gear up and down transit times for each gear? In real airplanes the gear never ( well rarely, maybe ) sequence in perfect unison. In reviewing the xml files for the 737, I note there are transit times defined for each flap position, but the kinematics for the gear is only a single value for up or down based on gear selection state. Is this something in Nasal? or native code or something in JSBsim? Thanks Jack _ ---BeginMessage--- Happy New Year everybody. I have been working on individual gear motion and failure for the last week and I think the result is usable. This change deals with the following: a) The gear position is computed for each individual gear if it is retractable and stored in a property named gear/unit[n]/pos-norm. The current implementation holds all gear positions in the property gear/gear-pos-norm. The suggested implementation does not break existing configurations that use gear/gear-pos-norm. b) To make a gear prone to failures, a actuator element may be used to drive each individual gear instead of a kinematic element. My configuration for the landing gear looks like this: channel name=Landing Gear actuator name=Gear Nose Actuator inputgear/gear-cmd-norm/input rate_limit0.1/rate_limit outputgear/unit[0]/pos-norm/output /actuator actuator name=Gear Left Actuator inputgear/gear-cmd-norm/input rate_limit0.13/rate_limit outputgear/unit[1]/pos-norm/output /actuator actuator name=Gear Right Actuator inputgear/gear-cmd-norm/input rate_limit0.15/rate_limit outputgear/unit[2]/pos-norm/output /actuator /channel Three files have to be changed for this: FGLGear.h introduces the method GetGearUnitPos() and two variables GearPos for the current gear unit position and useFCSGearPos, a flag for backward compatibility. FGLGear.cpp - implements GetGearUnitPos() which returns the current gear unit position. It checks if the useFCSGearPos flag is set or the gear/gear-pos-norm property has changed. This is for backward compatibility - binds and unbinds the gear/unit[n]/pos-norm properties the the GearPos variable JSBSim.cpp use the new gear-GetGearPos() method instead of FCS-GetGearPos() I have succesfully testet this with an existing unchanged configuration for the 737 and a modified configuration using the above example for the SenecaII. Here are FlightGear screenshots demonstrating the new feature: http://www.t3r.de/fg/gear-failure-1.jpg http://www.t3r.de/fg/gear-failure-2.jpg http://www.t3r.de/fg/gear-failure-3.jpg I hope this finds its way into JSBSim - it's fun to try a landing on a partially failed gear. Comments are welcome. The attached diff is against FlightGear cvs, but I can provide one against current JSBSim cvs. Sorry for the long posting. Torsten Hi, Torsten: Hey, don't apologize for the long posting - it usually means a lot of work has been done. :-) In theory, treating each landing gear individually seems like a good idea. In retrospect, I don't know why we didn't do it that way in the first place. The changes seem sensible. I'll look at this more at lunchtime. Unless anyone has any objections, I'll try to get this into JSBSim cvs in the next day or two. If I don't, please remind me and/or post a Feature Request at the JSBSim web site. I've been trying to address some of those in the past few days, and having the feature request and bug reports has been very helpful. Next, we probably should think about doing something similar for the spoilers, flaps, etc. - that is, treating them individually. I have some thoughts on that, but that's another topic. Jon - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Jsbsim-devel mailing list jsbsim-de...@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jsbsim-devel ___ The JSBSim Flight Dynamics Model project http://www.JSBSim.org ___ ---End Message--- -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and
Re: [Flightgear-devel] Gear transit times
Yes there are two or three aircraft that do this. I've modified the A380 in flightgear to use three groups with different times. I'm not near my desktop at the moment but can send you what I had modify to make it work. If you wanted detailed realism you could make different config for each gear and add a small offset depending on hydraulic pressure which could have some random filter applied.. S. castle...@comcast.net wrote: -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Gear transit times
Thanks, Jon judging by the date on the msg and looking over the code in an older 2.4 ( released around 2010 ) would appear the suggested change is in. And the property rate-limit sets the rate at which the actuator moves. Correct? node-getChild(position-norm, 0, true)-setDoubleValue(gear-GetGearUnitPos()); is the line of code in JSBSim.cxx. And to simulate a gear failure, one would set the rate limit property to zero? Neat! I'll give it a try tomorrow. Just installed a new gear system and gear indicators in the 737. Yes, downsizing the sim from a 747 to a 737 to make room for the new collimated displays. As Gene put it, serving as his first victim for the big iron display. The next few months will be interesting ;-) Jack - Original Message - From: Jon S. Berndt jonsber...@comcast.net To: FlightGear developers discussions flightgear-devel@lists.sourceforge.net Sent: Wednesday, August 29, 2012 9:10:30 PM Subject: Re: [Flightgear-devel] Gear transit times Jack, Check out the attached message from the JSBSim developer list. Jon From: castle...@comcast.net [mailto:castle...@comcast.net] Sent: Wednesday, August 29, 2012 7:52 PM To: FlightGear developers discussions Subject: [Flightgear-devel] Gear transit times Hi, Is it possible to specify gear up and down transit times for each gear? In real airplanes the gear never ( well rarely, maybe ) sequence in perfect unison. In reviewing the xml files for the 737, I note there are transit times defined for each flap position, but the kinematics for the gear is only a single value for up or down based on gear selection state. Is this something in Nasal? or native code or something in JSBsim? Thanks Jack - Original Message - -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Gear transit times
Hi Scott, Yes, please send me your mods when you have a moment. Thanks Jack - Original Message - From: Scott Hamilton scott.hamil...@popplanet.biz To: FlightGear developers discussions flightgear-devel@lists.sourceforge.net Sent: Wednesday, August 29, 2012 9:27:52 PM Subject: Re: [Flightgear-devel] Gear transit times Yes there are two or three aircraft that do this. I've modified the A380 in flightgear to use three groups with different times. I'm not near my desktop at the moment but can send you what I had modify to make it work. If you wanted detailed realism you could make different config for each gear and add a small offset depending on hydraulic pressure which could have some random filter applied.. S. castle...@comcast.net wrote: Hi, Is it possible to specify gear up and down transit times for each gear? In real airplanes the gear never ( well rarely, maybe ) sequence in perfect unison. In reviewing the xml files for the 737, I note there are transit times defined for each flap position, but the kinematics for the gear is only a single value for up or down based on gear selection state. Is this something in Nasal? or native code or something in JSBsim? Thanks Jack - Original Message - -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
