Re: [Flightgear-devel] Models Question

2003-11-17 Thread Innis Cunningham
Lee Elliott writes Hi Lee I can take a jpeg but I dont know how to show it.Is there somewhere I can send it to be displayed. Strange... Could you put a copy of the model up somewhere so we could have a look at it. That it seems to work ok with s/w rendering must be significant, although what

Re: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread Erik Hofman
David Culp wrote: I think the trick is to zero-out the speeds, forces and moments when the airplane's forward speed approaches zero. But you then have to allow the airplane to accelerate out of this frozen state to move again. I didn't find an answer. After thinking a bit about this problem

RE: [Flightgear-devel] Electrical system work..

2003-11-17 Thread Richard Bytheway
And actually, you get quite a variety of ammeter variation depending on if you are running battery only, have an alternater fail, have the alternator working, have the engine running, and or have a lot of devices and lights going. This change in current must be due to the voltage on the

[Flightgear-devel] Re: Models Question

2003-11-17 Thread Melchior FRANZ
* Innis Cunningham -- Monday 17 November 2003 09:06: I can take a jpeg but I dont know how to show it.Is there somewhere I can send it to be displayed. I've put it here: http://members.aon.at/mfranz/737_surfaces.jpg (41 kB) m. ___

Re: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread Erik Hofman
David Megginson wrote: Andy Ross writes: JSBSim and YASim do things pretty much the same way, using a coefficient of friction for gear as they slide over the ground. This integration works fine for a moving aircraft, Unfortunately, not -- when the JSBSim and YASim aircraft are rolling,

Re: [Flightgear-devel] Electrical system work..

2003-11-17 Thread Erik Hofman
Richard Bytheway wrote: This change in current must be due to the voltage on the supply changing, thus we actually need to know the resistance of each load, and the output voltage of each source. Then the current on the system is then calculated from Ohm's Law, V=IR, or in this case I=V/R. Well,

Re: [Flightgear-devel] AI aircraft carrier

2003-11-17 Thread David Luff
On 11/16/03 at 7:56 PM David Culp wrote: I'll send you the code if you like. I've written a bare-bones AI system based on David Luff's. The AI manager just instantiates an AI object (airplane or ship) wherever you want it and tells it when to update. The AI objects are AIAircraft (yes, even

Re: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread William Earnest
Erik Hofman wrote: David Culp wrote: I think the trick is to zero-out the speeds, forces and moments when the airplane's forward speed approaches zero. But you then have to allow the airplane to accelerate out of this frozen state to move again. I didn't find an answer. After thinking a

[Flightgear-devel] Re: Landing Gear Dynamics

2003-11-17 Thread Jon Berndt
Erik wrote: Thinking about it a bit more this makes sense. Calculating every wheel separately isn't the whole story. In the end there is the friction caused by the complete landing gear which isn't wheel spin dependent. I've considered this. It's possible I didn't code it right. I got the

Re: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread Erik Hofman
Erik Hofman wrote: Thinking about it a bit more this makes sense. Calculating every wheel separately isn't the whole story. In the end there is the friction caused by the complete landing gear which isn't wheel spin dependent. So now you've got: 1. friction calculate every wheel separately.

re: [Flightgear-devel] Landing Gear discussion

2003-11-17 Thread David Megginson
Jon Berndt writes: In the end, it could turn out that a physics-based approach is not worth the effort, and we should simply make the aircraft do what experience tells us a real aircraft would do. As either you or Andy mentioned before, the problem is the transition. Improving the

Re: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread David Megginson
Erik Hofman writes: So now you've got: 1. friction calculate every wheel separately. 2. add all frictions for the landing gear. 3. make the friction for every wheel dependent to wheel spin and use the result for moments and force calculations. 4. calculate the moments and forces

RE: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread Jon Berndt
Come to think about it, it's not averaging we need. The landing gear calculations are a vector from the midpoint between all wheels and as such should be added as a vector product to the calculations tot the separate wheels. Erik ?? Not sure I follow you. Also, I've renamed the thread to

re: [Flightgear-devel] Landing Gear discussion

2003-11-17 Thread Jim Wilson
Jon Berndt [EMAIL PROTECTED] said: If there were no winds at all, that might help. Otherwise, it doesn't work at all. Jon Let me expand on that. If you do come to a stop, and there are no winds at the moment, then the winds come up after you have stopped, then having reduced the

[Flightgear-devel] Re: Landing Gear Dynamics

2003-11-17 Thread Erik Hofman
Jon Berndt wrote: Come to think about it, it's not averaging we need. The landing gear calculations are a vector from the midpoint between all wheels and as such should be added as a vector product to the calculations tot the separate wheels. Erik ?? Not sure I follow you. While the wheel

[Flightgear-devel] Re: AI merge

2003-11-17 Thread David Culp
It would definately make sense to unite our AI systems at some point. At the moment I'm carrying a stack of diffs locally to mine since I'm about half way through getting generic GA VFR traffic to appear randomly at controlled airports, so I'd rather not try a major merge and restructure

re: [Flightgear-devel] Landing Gear discussion

2003-11-17 Thread David Megginson
Jim Wilson writes: So then what would happen if you artificially introduced resistance at the same time (near zero velocity) in a manner similar to a partially applied parking brake? The problem is that if the landing gear produces opposing forces or moments that are too great, the plane

Re: [Flightgear-devel] Re: Landing Gear Dynamics

2003-11-17 Thread Jon S Berndt
On Mon, 17 Nov 2003 15:03:39 +0100 Erik Hofman [EMAIL PROTECTED] wrote: While the wheel dynamics allow the wheels to move sideways easily, the landing gear dynamics does not allow the landing gear to move sideways (easily). So apart from the the individual wheel dynamics we also need to

[Flightgear-devel] Model question

2003-11-17 Thread matt
Is there a way to have specular effects on the models in FG? Using Blender or AC3D? I suppose there is some Plib issue but I thought I'd ask... Thanks, Matt. ___ Flightgear-devel mailing list [EMAIL PROTECTED]

Re: [Flightgear-devel] Re: Landing Gear Dynamics

2003-11-17 Thread Andy Ross
Erik Hofman wrote: Now the resulting moments and forces should be added by the results of the individual wheels, not by averaging it, but rather by vector mathematics. The FDMs already do this. Each gear gets its own force application, which is a sum of compressive force along the strut and

Re: [Flightgear-devel] Airport vehicle (driving) sim

2003-11-17 Thread Andy Ross
David Megginson wrote: Andy Ross writes: JSBSim and YASim do things pretty much the same way, using a coefficient of friction for gear as they slide over the ground. This integration works fine for a moving aircraft, Unfortunately, not -- when the JSBSim and YASim aircraft are rolling,

Re: [Flightgear-devel] Model question

2003-11-17 Thread Andy Ross
matt wrote: Is there a way to have specular effects on the models in FG? Using Blender or AC3D? I suppose there is some Plib issue but I thought I'd ask... It depends on what you mean. Plib support a specular exponent (Phong model) in the lighting computations just fine. This gets you

[Flightgear-devel] Landing Gear

2003-11-17 Thread David Megginson
Andy Ross writes: Hrm... well that throws a wrench into the static spring force while stopped idea. Maybe it could be salvaged by doing the static spring computation only in the (1D) transverse direction... Again, I'm wondering if this is an aerodynamic problem (aside from the

Re: [Flightgear-devel] Re: AI merge

2003-11-17 Thread David Luff
On 11/17/03 at 8:34 AM David Culp wrote: A merge of AI systems at the bottom end looks easy. Our base classes are nearly identical. The merge at the top end, the manager, would be more difficult. I'd like the manager to be dumb as well, in that no scenarios are hard coded. In my view the

Re: [Flightgear-devel] Landing Gear

2003-11-17 Thread Jon S Berndt
On Mon, 17 Nov 2003 11:33:35 -0500 David Megginson [EMAIL PROTECTED] wrote: Again, I'm wondering if this is an aerodynamic problem (aside from the bouncing-around-sitting-still thing). Because of its lifting surfaces, a plane is certainly more vulnerable to the wind than a car, even when it is

Re: [Flightgear-devel] Model question

2003-11-17 Thread matt
Can this be specified per object or in the header for the entire model? I just wondered if there was a rason that the aircraft models in FlightGear aren't very 'shiny'. Thats not a slant on the respective authors BTW, :-) Thanks, Matt. On Mon, Nov 17, 2003 at 08:16:34AM -0800, Andy Ross

Re: [Flightgear-devel] Model question

2003-11-17 Thread Andy Ross
matt wrote: Can this be specified per object or in the header for the entire model? It's per-material. AC3D puts all the materal formats together in the header of the document. Andy ___ Flightgear-devel mailing list [EMAIL PROTECTED]

Re: [Flightgear-devel] Re: AI merge

2003-11-17 Thread David Culp
for instance, the instruction to Make random AI appear around KSJC could be done something like this: ai ... entry methodrandom/method classlocal-traffic/class airportKSJC/airport /entry ... /ai Thats a lot of files for every airport!!! Actually it's only one

[Flightgear-devel] Ellipsoid math

2003-11-17 Thread Paul Surgeon
Does anyone know how to determine the tangent to a point on a wgs84 ellipsoid? In particular I'm trying to find the geodetic center point of a wgs84 ellipsoid based on a geodetic point on the surface. Explanation attempt 1 : If I extend a line towards the inside of the ellipsoid which is

RE: [Flightgear-devel] Ellipsoid math

2003-11-17 Thread Norman Vine
Paul Surgeon writes: Does anyone know how to determine the tangent to a point on a wgs84 ellipsoid? this should help FG_SRC / tests / test_up.cxx Are there any good sources that will walk me through ellisoid maths step-by-step? There are many my favorite are

Re: [Flightgear-devel] Ellipsoid math

2003-11-17 Thread Paul Surgeon
On Monday, 17 November 2003 22:46, Norman Vine wrote: There are many my favorite are http://www.colorado.edu/geography/gcraft/notes/datum/datum.html http://earth-info.nima.mil/GandG/geolay/toc.htm http://www.irbs.com/bowditch/ My favorite text Bomford, G. 1980. Geodesy. Oxford: Clarendon

Re: [Flightgear-devel] Re: AI merge

2003-11-17 Thread David Luff
David Culp writes: for instance, the instruction to Make random AI appear around KSJC could be done something like this: ai ... entry methodrandom/method classlocal-traffic/class airportKSJC/airport /entry ... /ai Thats a lot of files for every

Re: [Flightgear-devel] Models Question

2003-11-17 Thread Wolfram Kuss
Hi I do not think it's a problem with the normal. Like someone else hinted, it might be the specular exponent. Unfortunately, I do not rememebr a good value, but I think one of the three numbers 1,3,10 should be good. So, if you try the three one after the other, maybe with an ascii editor in

[Flightgear-devel] FG AI with server

2003-11-17 Thread Seamus Thomas Carroll
Hi, Starting today (monday) I will be working on a ground vehicle server that will manage the movement of ground vehicles over a road network. The server will be in charge of calculating the ground elevation and movement of each vehicle every second. Any connecting client (FG) will be passed

[Flightgear-devel] easyxml

2003-11-17 Thread Seamus Thomas Carroll
Hi, Is there a tutorial or can someone give or direct me to a simple example on how to use easyxml? I am trying to work my way through props_io.cxx but it is not an easy introduction. Seamus ___ Flightgear-devel mailing list [EMAIL PROTECTED]

re: [Flightgear-devel] Landing Gear discussion

2003-11-17 Thread Jim Wilson
David Megginson [EMAIL PROTECTED] said: Jim Wilson writes: So then what would happen if you artificially introduced resistance at the same time (near zero velocity) in a manner similar to a partially applied parking brake? The problem is that if the landing gear produces opposing

Re: [Flightgear-devel] Landing Gear discussion

2003-11-17 Thread David Megginson
Jim Wilson wrote: Can't we bring in some sort of damping factor that would just render the aircraft stuck at very small velocities, but would still allow it to become unstuck if a great enough force was applied? A sort of automatic parking break that gets applied gradually starting at 0.01 fps

Re: [Flightgear-devel] easyxml

2003-11-17 Thread David Megginson
Seamus Thomas Carroll wrote: Is there a tutorial or can someone give or direct me to a simple example on how to use easyxml? I am trying to work my way through props_io.cxx but it is not an easy introduction. Do you want to work with properties or raw, low-level XML? Properties provide a

Re: [Flightgear-devel] Landing Gear discussion

2003-11-17 Thread Andy Ross
David Megginson wrote: I was amazed at how tricky this got a year or so ago when I was experimenting with it. I agree that we need some kind of damping at slow speed. Essentially, the gear forces have to become a special case, reducing forces and moments towards zero but never beyond into

Re: [Flightgear-devel] easyxml

2003-11-17 Thread Seamus Thomas Carroll
I figured out the what you mention. The part that confuses me is how to put the data from the xml file in a desired location. For example if I have the xml document: ... vehicle id1/id lon-128.553223/lon lat54.233123/lat /vehicle ... How does id, lon, lat initialize the variables int

Re: [Flightgear-devel] easyxml

2003-11-17 Thread David Megginson
Seamus Thomas Carroll wrote: I figured out the what you mention. The part that confuses me is how to put the data from the xml file in a desired location. For example if I have the xml document: ... vehicle id1/id lon-128.553223/lon lat54.233123/lat /vehicle ... How does id, lon, lat

Re: [Flightgear-devel] Models Question

2003-11-17 Thread Jim Wilson
Innis Cunningham [EMAIL PROTECTED] said: Hi Guys I guess this is directed to the model makers. I am making a model with AC3D and I have five surfaces that stay white in FG even though I apply a material to them. I have tried fliping normals or rearranging the vertex order but still they

Re: [Flightgear-devel] Model question

2003-11-17 Thread Lee Elliott
On Monday 17 November 2003 18:17, Andy Ross wrote: matt wrote: Can this be specified per object or in the header for the entire model? It's per-material. AC3D puts all the materal formats together in the header of the document. Andy plus still figuring stuff out:) LeeE

Re: [Flightgear-devel] Re: Models Question

2003-11-17 Thread Lee Elliott
On Monday 17 November 2003 09:18, Melchior FRANZ wrote: * Innis Cunningham -- Monday 17 November 2003 09:06: I can take a jpeg but I dont know how to show it.Is there somewhere I can send it to be displayed. I've put it here: http://members.aon.at/mfranz/737_surfaces.jpg (41 kB)

[Flightgear-devel] Nasal integration

2003-11-17 Thread Andy Ross
OK, I had some time over the weekend to carry out my threat of hacking the Nasal interpreter into FlightGear. So now we have another language to flame about. :) http://www.plausible.org/andy/fg-nasal-1.0.tar.gz [This touches SimGear, FlightGear and the base package, so you'll see

RE: [Flightgear-devel] Nasal integration

2003-11-17 Thread Jon Berndt
I just want to know: why nasal? :-) ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel

Re: [Flightgear-devel] Nasal integration

2003-11-17 Thread Andy Ross
Jon S. Bertdt wrote: I just want to know: why nasal? Because, sir, I am a marketing genius. :) Actually, it start out life as Nasl, which was an acronym for Not Another Scripting Language. There wasn't much purpose behind that name either, but it was reasonably descriptive. And similar

RE: [Flightgear-devel] Nasal integration

2003-11-17 Thread Jon Berndt
Jon S. Berndt wrote: I just want to know: why nasal? Like I said. I don't have a clue. Andy nasal ... Sounds like it might have something to do with the space program ... ;-) ___ Flightgear-devel mailing list [EMAIL PROTECTED]