[Request] .yfs file parameters

[decaff_42]

Hello,

As I mentioned in the mchat yesterday, I'm working on a series of 200-odd test points to gage the effect airspeed and altitude have on throttle in straight and level flight (autopilot #2). The goal is to predict the maximum range or best speed/ altitude to fly at to reach a destination the fastest and turn it into a useful tool for long-range civilian flights.


Now on to my request.

I am wondering if there is any documentation as to what the various parameters in the .YFS file are. If the throttle position is included in these, I would love to know, as I am introducing some error with my current method of getting the throttle percent. (Take a screenshot and measure the ration of pixels covered/uncovered by the throttle indicator)

I know that the following parameters:

Code: Select all

Time
x-position / altitude / z-position / ... the rest are unknown to me
this line is unknown to me
0 to finish off the entry

Then there are other parts of the code at the end that I have no clue about. but it looks like a bunch of srf files with vertex and face definitions.


Does anyone have a better idea as to what these are? I assume that there are some regarding flaps gear, and other animations, but I am unsure. Any help would be greatly appreciated!!!

I thought I would ask the community before doing too many test points and then find out there is a better way.

[Lor599]

Hmmm...I can't remember much off the top of my mind about the yfs files. But, probably tomorrow, I will study the yfs file some more. Right now ,though, I've got to study for school...not yfs files
I might write the document also.

[waspe414]

Have a dump of my YSF analysis text file:
(I skimmed just before uploading, but can't actually remember any of this. I can refresh my memory if things aren't clear.)

YFSVERSI 20130805
FIELDNAM AOMORI 0 0 0 0 0 0 FALSE LOADAIR:FALSE
ENVIRONM DAY
ALLOWGUN TRUE
ALLOWAAM TRUE
ALLOWAGM TRUE
ALLOWBOM TRUE
ALLOWRKT TRUE

==================================================================================

EVTBLOCK

WNDCHG 0.0 0
WIND 0.000000m/s 0.000000m/s 0.000000m/s
ENDEVT

TXTEVT 0.0 0
TXT Text here
ENDEVT

VISCHG 0.0 0
VISI 8000m
ENDEVT

VISCHG 15.0 0
VISI CLDLYR OVC 800ft 1000ft
ENDEVT

PLRAIR 0.000000 0
OBJID 5
ENDEVT

AIRCMD 370.237000 0
AIRID 5
TXT MALFUNCT HUDFLICKER
ENDEVT

EDEVTBLK

----------------

Type / time / 0
Specifics

WNDCHG changes wind to specified velocity

TXTEVT writes text TXT at time

VISCHG changes visibility to VISI
or adds cloud layers

PLRAIR changes the camera focus to OBJID at time (Pain in the ass)

==================================================================================

AIRPLANE F-16C_FIGHTINGFALCON TRUE SUBST:F-18C_HORNET
STARTPOS NA MISAWA_RW10
IDENTIFY 0
IDANDTAG 5 ""
AIRPCMND UNLOADWP
AIRPCMND LOADWEPN IFLR 20
AIRPCMND LOADWEPN AIM120 2
AIRPCMND LOADWEPN AIM9 6
AIRPCMND LOADWEPN AGM65 6
AIRPCMND LOADWEPN FUEL 1000
AIRPCMND LOADWEPN AIM9X 2
AIRPCMND LOADWEPN B500HD 2
AIRPCMND LOADWEPN FUEL 800
AIRPCMND LOADWEPN FLR 20
AIRPCMND SMOKEOIL 100.0kg
AIRPCMND SMOKECOL 0 135 180 255
AIRPCMND INITFUEL 75%

AIRPCMND POSITION -68031.14m 32.11m 21996.24m
AIRPCMND ATTITUDE -89.93deg 0.00deg -0.00deg
AIRPCMND CTLLDGEA TRUE
AIRPCMND INITSPED 0.000000m/s
AIRPCMND INITFUEL 80%

INTENTIO
MINIALTI 0
FORMATIO 0 -15.85 -7.00 -15.85
FOM_TRNS -5.28 -7.00 -15.85
FOM_TRNS 0.00 -7.00 -15.85
FOM_TRNS 0.00 -3.00 -15.85
FOM_AFTR 4 -15.85 -3.00 -15.85
FOM_AFTR 5 15.85 -3.00 -15.85
FOM_SYNC TRUE
ENDINTEN
***or***
INTENTIO
AIRROUTE
ROUTETAG "CARRIER_LOOP"
ROUTEIDX 0
LEGSTART 0.000000m 0.000000m 0.000000m
MINIALTI 330
ENDINTEN
***or***
INTENTIO
DOGFIGHT G7.00 B20.00 F6
GIVEUPDS 20000.0m
MINIALTI 1000
ENDINTEN

AIRPCMND SETCNTRL TRIM:0.2
NUMRECOR 66 3

==================================================================================

AIRCRAFT
-----------------------------

34.094
45693.328 2.056 -10563.98 -1.7453 0.0247 0.0 0.0
6 255 255 255 255 199 0 0 240 10 0 0 0 0 0 0 0 0
0 0.0000 0.0000 0

----------------

TIME
pos[x? y? z?] / rot[x? y? z?] / Gforce
flight state (6=stopped,5=unknown,4=dead,3=left the airplane,2=stall,1=rolling,0=flying) / VGW(255) / Airbrake(255) / Gear(255) / Flap(255) / Brake(255) / Smoke (Boolean 0-1) / Vapor trail (Boolean 0-1) / Misc(totalled: 128=landing,64=strobe,32=nav,16=beacon,8=overrun,4=Velocity indicator,1=Afterburner) / strength(decreases with damage) / Throttle(99) (slaved to reverser) / Elevator(+-99) / Aileron(+-99) / Rudder(+-99) / Trim(99) / TV(99) / Reverse Thrust(99) / Bomb bay(99)
Turret number / [ Turretx(rad) / Turrety(rad) / Firing (0/2) ] {not shown if no turret}



#NOTES Aircraft die at 1 health, not zero. F-16 has 9 HP
Rotation, starting from Aomori 10, is yaw, pitch, roll (when horizontal) [-3.13 < yaw < 3.13: W~1.6, S~-3.1, E~-1.56]


==================================================================================

GROUND
-----------------

1.576
47969.1 0.0 7971.33 -0.0 0.0 -0.0
0 10
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0 0
0 0 0 0 0 0
0

----------

TIME
pos[x? y? z?] / rot[x? y? z?]
Rest unknown

===================================================================================

BULRECOR
VERSION 4
NUMRECO 43

1.466 0 45698.23 2.30 -10563.93 -1.74 0.02 0.00
178.16 5000.00 12 A4 P
1020.00 1.57 0.52 -1

-----------------

Time / Type(0=gun,1=AIM9,2=AGM,3=500lb,4=rocket,5=flare,6=AIM120,7=250lb,9=500lbHD,10=A-AAM,12=fuel) / pos[x? y? z?] / rot[x? y? z?]
Note 1 / Range / Damage / Aircraft number* / (P)layer or (N)ot
Missile velocity / 1.57 / 0.52 / Target aircraft number (-1 for no target)

#NOTES
Note 1: Launch velocity: Bullets have a value of 1700, all other weapons have a value that is the aircraft velocity at launch, in m/s
Note 2: Missile velocity appears for missiles and rockets, not bombs. The numbers after only appear for guided weapons. (Missile final velocity)
* Aircraft number is assigned, starting with 0, in order of listing (See top) [IDANDTAG #-1]

-------------------------
-------------------------

KILLCREDIT 1 5
0 A4 G117 P 46633.5 28.2 -11209.7 20.0
0 A4 G116 P 46647.0 28.8 -11241.0 20.7
0 A4 G115 P 46772.1 31.4 -11290.1 21.2
0 A4 G114 P 46909.3 33.6 -11272.9 21.8
0 A4 G113 P 47044.4 36.2 -11303.5 22.3
1 A0 A1 P -2382.7 3374.9 40.6 11.5
1 A4 A5 P 57874.8 3251.7 -10940.3 11.3
10 A6 A4 N 53228.4 2039.5 -17974.4 105.1
6 A6 A2 N 45428.9 301.1 -12599.3 139.5
1 A4 A6 P 49505.7 2042.3 -14008.0 162.6
ENDRECO

---------------

Weapon type / Launch aircraft / Target / Launch is Player or Not / pos[x? y? z?] / time

-------------------------
-------------------------

EXPRECOR
VERSION 3
NUMRECO 8
11.294 57873.95 3251.87 -10937.36 10.00 1.00 25.00 N 1 0
11.294 57874.84 3251.66 -10940.35 20.00 5.00 18.00 N 1 0
105.129 53221.57 2034.86 -17972.03 10.00 1.00 23.00 N 1 0
105.129 53228.38 2039.53 -17974.40 20.00 5.00 23.00 N 1 0
139.512 45436.04 305.42 -12606.79 10.00 1.00 23.00 N 1 0
139.512 45428.92 301.09 -12599.31 20.00 5.00 25.00 N 1 0
162.569 49508.53 2044.34 -14009.68 10.00 1.00 24.00 N 1 0
162.569 49505.73 2042.26 -14008.04 20.00 5.00 18.00 N 1 0
ENDRECO
===================================================================================

WEATHERX
CONSTWIND 0.000000m/s 0.000000m/s 0.000000m/s
VISIBILIT 20000.000000m
ENDWEATHER
SLDCLOUD
0 12
Surf

#NOTE .srf goes here, with vertices for all clouds, then connects all vertices into cloud shapes. Only geometry stored, and shaded by the game into cloud volumes

Why I have this stuff lying around I'll never know, but hey.

[Flake]

[post]90235[/post] AIRCRAFT
-----------------------------

34.094
45693.328 2.056 -10563.98 -1.7453 0.0247 0.0 0.0
6 255 255 255 255 199 0 0 240 10 0 0 0 0 0 0 0 0
0 0.0000 0.0000 0

If you were to split each value by a space, ignoring new lines from top (34.094) being value 0, to bottom (0) being value 26...

Aircraft timestamp info, straight from my debug the other week for loading replays into OYS:

Code: Select all

                    //RecordArray[0] = Input[0].Split(' ')[0];    //TimeStamp
                    
                    //RecordArray[1] = Input[1].Split(' ')[0];    //PosX - Float
                    //RecordArray[2] = Input[1].Split(' ')[1];    //PosY - Float
                    //RecordArray[3] = Input[1].Split(' ')[2];    //PosZ - Float
                    //RecordArray[4] = Input[1].Split(' ')[3];    //HdgX - Float
                    //RecordArray[5] = Input[1].Split(' ')[4];    //HdgY - Float
                    //RecordArray[6] = Input[1].Split(' ')[5];    //HdgZ - Float
                    //RecordArray[7] = Input[1].Split(' ')[6];    //LoadFactor - Float

                    //RecordArray[8]  = Input[2].Split(' ')[0];   //AirState Direct
                    //RecordArray[9] = Input[2].Split(' ')[1];   //VGW 0-255
                    //RecordArray[10] = Input[2].Split(' ')[2];   //Boards 0-255
                    //RecordArray[11] = Input[2].Split(' ')[3];   //Gear 0-255
                    //RecordArray[12] = Input[2].Split(' ')[4];   //Flap 0-255
                    //RecordArray[13] = Input[2].Split(' ')[5];   //Brake 0-255
                    //RecordArray[14] = Input[2].Split(' ')[6];   //Smoke 0-255
                    //RecordArray[15] = Input[2].Split(' ')[7];   //??? - Leave 0
                    //RecordArray[16] = Input[2].Split(' ')[8];   //Animation flags (Lights, gun, contrails, burners)
                    //RecordArray[17] = Input[2].Split(' ')[9];   //Strength 0-255
                    //RecordArray[18] = Input[2].Split(' ')[10];  //Throttle 0-100
                    //RecordArray[19] = Input[2].Split(' ')[11];  //Elevator - Signed Byte -100 to +100.
                    //RecordArray[20] = Input[2].Split(' ')[12];  //Aileron - Signed Byte  -100 to +100.
                    //RecordArray[21] = Input[2].Split(' ')[13];  //Rudder - Signed Byte -100 to +100.
                    //RecordArray[22] = Input[2].Split(' ')[14];  //Trim - Signed Byte -100 to +100.
                    //RecordArray[23] = Input[2].Split(' ')[15];  //Thrust Vector 0-100
                    //RecordArray[24] = Input[2].Split(' ')[16];  //Thrust Reverse 0-100
                    //RecordArray[25] = Input[2].Split(' ')[17];  //Bomb Bay 0-100

                    //RecordArray[26] = Input[3].Split(' ')[0];   //Terminator, leave as 0

[decaff_42]

Thanks for the info guys! This is super helpful. I noticed that in some tests the throttle would fluctuate and a single image wouldn't get that very well. The .yfs throttle lets me average the throttle level over a cycle, getting good data!

@ Flake, Just a note about the throttle level. It seems that the .yfs file only allows 0-99 for that entry. I had a ground test at mil power and it read 99 rather than 100.

I'm saving the .yfs files now. In the future I may make a tool that will allow me to extract all kinds of information to examine flaps, brake, gear performance, etc.

One interesting thing I found while trying to find the max speed (By starting above it and then going into autopilot) was that the autopilot only commanded 98, but I could take control and command 99 throttle level.

Because of the fluctuating throttle I decided to go back and redo the points I already got, and the extra practice I have now helped me get the points much faster.

[Grigor]

This is interesting! Possibly the basis for a piggyback program that involves missions / credits / buying better planes and weapons with credits etc... A sense of CONTINUITY rather than a series of random flights. For single player, of course...

By the way, does anyone know what the KILLCREDIT 1 5 number represent? They don't seem to correlate... will check it out.

[decaff_42]

For continuity, here's a link to some of the results of this testing.

I'm working on a new effort to understand lift and drag. I've done some better preparation and right now I'm writing a test plan and working on figuring out what data I actually need and how to reduce errors. I am writing a longish (already 15 pages of content with a few for titles and lists) document with my preparation, plan and results.

I wrote a python code to calculate a whole mess of parameters from the YFS file (such as Angle of Attack and Angle of Side Slip and their first and second derivatives) so I plan on modifying that code to calculate only the small subset of parameters I actually need for the different test objectives.

If someone would like to help develop the plan and do some of the test flights, please contact me via PM so we can discuss things. Looking ahead I know this will be an intensive project.

[decaff_42]

Pardon the additional Necro, but with the compilation of information in my YFS2CSV program I thought I'd directly share the information about the YFS parameters that are stored in the YFS File. Please not that this takes largely from Waspe414's post and is expanded in areas to indicate directions and values for certain things.

Code: Select all

  A. Time Step
-------------------------------------------------------------------------------
Looking at any output data it is possible to see that the YFS recording does
not proceed with a consistant time change between recorded data. This is a
method of space-saving and only when there are change to the aircraft's state,
position or orientation, will data be recorded.


  B. Parameter Descriptions
-------------------------------------------------------------------------------
+-----------+---------+------------------------------------------------------+
| Parameter | Units   | Description                                          |
+-----------+---------+------------------------------------------------------+
| Time      | Seconds | The truncated time of the recorded slice of data.    |
|           |         | Time may go out to three decimal places.             |
+-----------+---------+------------------------------------------------------+
| X-Pos     | Meters  | The X-direction coordinate of the aircraft's         |
|           |         | position. Positive X values are to the East of the   |
|           |         | map center, while negative X values are to the       |
|           |         | West of the map center.                              |
+-----------+---------+------------------------------------------------------+
| Y-Pos     | Meters  | The Y-direction coordinate of the aircraft's         |
|           |         | position. Also the altitude of the aircraft.         |
+-----------+---------+------------------------------------------------------+
| Z-Pos     | Meters  | The Z-direction coordinate of the aircraft's         |
|           |         | position. Positive Z values are to the North of      |
|           |         | the map center, while negative Z values are to       |
|           |         | the South of the map center.                         |
+-----------+---------+------------------------------------------------------+
| Compass   | Radians | The Compass Heading of the aircraft with 0 being     |
| Heading   |         | due North. Value ranges between -pi/2 to pi/2,       |
|           |         | which both represent due south. Positive values are  |
|           |         | for when the aircraft is pointed east of north.      |
+-----------+---------+------------------------------------------------------+
| Pitch     | Radians | The Pitch Angle of the aircraft. Positive when nose  |
| Angle     |         | is towards the sky, negative when the nose is        |
|           |         | pointed towards the ground. 0 is when the            |
|           |         | aircraft is pointed at the horizon. Value ranges     |
|           |         | from -pi/2 to pi/2.                                  |
+-----------+---------+------------------------------------------------------+
| Bank      | Radians | Rotation of aircraft about nose-to-tail axis.        |
| Angle     |         | Turn to the left is a positive value and a turn      |
|           |         | to the right is a negative value. 0 is when the      |
|           |         | aircraft is upright and wings-level. Value           |
|           |         | ranges from -pi/2 to pi/2.                           |
+-----------+---------+------------------------------------------------------+
| G         | N/A     | The G-load on the aircraft. Positive or negative.    |
|           |         | Only goes to one decimal place.                      |
+-----------+---------+------------------------------------------------------+
| Flight    | N/A     | 0 = Flying                                           |
| State     |         | 1 = Rolling                                          |
|           |         | 2 = Stalled                                          |
|           |         | 3 = [Unknown]                                        |
|           |         | 4 = Dead                                             |
|           |         | 5 = [Unknown]                                        |
|           |         | 6 = Stopped                                          |
+-----------+---------+------------------------------------------------------+
| VGW       | N/A     | The position of the Variable Geometry Wing on the    |
|           |         | aircraft. Value goes from 0 (Swept back) to 255      |
|           |         | (Swept forward).                                     |
+-----------+---------+------------------------------------------------------+
| Airbrake  | N/A     | Position of the spoilers. 0 is retracted, 255 is     |
|           |         | fully deployed.                                      |
+-----------+---------+------------------------------------------------------+
| Flaps     | N/A     | Position of the flaps. 0 is retracted, 255 is fully  |
|           |         | deployed. Default Values:                            |
|           |         | 0 = Flaps Retracted                                  |
|           |         | 63 = 1/4 Deployed                                    |
|           |         | 127 = Half Deployed                                  |
|           |         | 191 = 3/4 Deployed                                   |
|           |         | 255 = Fully Deployed                                 |
+-----------+---------+------------------------------------------------------+
| Landing   | N/A     | Position of the landing gear. 0 is fully retracted   |
| Gear      |         | and 255 is fully deployed down.                      |
+-----------+---------+------------------------------------------------------+
| Brakes    | N/A     | Value of brake application from 0 (not on) to        |
|           |         | 255 (full braking).                                  |
+-----------+---------+------------------------------------------------------+
| Smoke     | N/A     | Boolean Value: 0 = OFF, 1 = ON.                      |
+-----------+---------+------------------------------------------------------+
| Vapor     | N/A     | Boolean Value: 0 = OFF, 1 = ON.                      |
| Trail     |         |                                                      |
+-----------+---------+------------------------------------------------------+
| Misc      | N/A     | The SUM of the following values to determine         |
|           |         | other aircraft conditions:                           |
|           |         | 1 = Afterburner ON                                   |
|           |         | 4 = Velocity Indicator                               |
|           |         | 8 = Overrun                                          |
|           |         | 16 = Beacon Lights ON                                |
|           |         | 32 = Navigation Lights ON                            |
|           |         | 64 = Strobe Lights ON                                |
|           |         | 128 = Landing Lights ON                              |
+-----------+---------+------------------------------------------------------+
| Strength  | N/A     | Strength of the aircraft. When this value reaches    |
|           |         | 0, the aircraft is "killed".                         |
+-----------+---------+------------------------------------------------------+
| Throttle  | N/A     | The throttle position of the aircraft. Note this is  |
|           |         | slaved to the thrust reverser, so as that spools     |
|           |         | up, so will the throttle. Values from 0 (No Thrust)  |
|           |         | to 99 (Maximum Thrust). Even in different stages     |
|           |         | of Afterburner, these values will still be used.     |
+-----------+---------+------------------------------------------------------+
| Elevator  | N/A     | The position of the Elevator. Values go from         |
|           |         | -99 to +99 with 0 being the neutral position.        |
|           |         | Positive values indicated a pitch up elevator        |
|           |         | position.                                            |
+-----------+---------+------------------------------------------------------+
| Aileron   | N/A     | Aileron Position with 0 being neutral. Left roll     |
|           |         | is a positive value, right roll is a negative value. |
|           |         | Values are from -99 to 99.                           |
+-----------+---------+------------------------------------------------------+
| Rudder    | N/A     | Ruder Position with 0 being neutral. Left turn       |
|           |         | is a positive value, right turn is a negative value. |
|           |         | Values are from -99 to 99.                           |
+-----------+---------+------------------------------------------------------+
| Thrust    | N/A     | Thrust Vectoring Control. Values from 0 to 99:       |
| Vector    |         | 0 = Forward Thrust                                   |
|           |         | 9 = 1st Step                                         |
|           |         | 19 = 2nd Step                                        |
|           |         | 29 = 3rd Step                                        |
|           |         | 39 = 4th Step                                        |
|           |         | 49 = 5th Step                                        |
|           |         | 59 = 6th Step                                        |
|           |         | 69 = 7th Step                                        |
|           |         | 79 = 8th Step                                        |
|           |         | 89 = 9th Step                                        |
|           |         | 99 = Full Thrust Vector                              |
+-----------+---------+------------------------------------------------------+
| Reverse   | N/A     | Thrust Reverse Command. Requires DAT file            |
| Thrust    |         | to slave in the Throttle. 0 (No Reverse) to 99       |
|           |         | (Full Reverse).                                      |
+-----------+---------+------------------------------------------------------+
| Bomb      | N/A     | Bomb Bay Position (0 = Closed, 99 = Open)            |
| Bay       |         |                                                      |
+-----------+---------+------------------------------------------------------+
| Turrets   | N/A     | [Unknown] Aircraft with more turrets will have       |
|           |         | extra columns with no header.                        |
+-----------+---------+------------------------------------------------------+

[Strava]

Is there an event command that would allow changing the LIGHTSRCD value?
Changed at intervals, this could be used to simulate time of day.
Or just set it once to get the light where you want it.

I like the way the shading looks with the light at a low angle.
This setting is the right angle for sunset in November:
LIGHTSRCD -0.920000 0.100000 -0.390000

[Flake]

Ooooh that's real clever, I didn't know you could set the light source direction so accurately. Is this a 2015+/OpenGL2 variable or can we use that in 2011 and back?

My understanding is that this sets the light source direction, not the lighting type. Sadly, only way to set day/night is on an open source server.

[Strava]

I am running the 20150425 windows version of YSF.
The LIGHTSRCD variable is in the flight.cfg file.
It's where all the settings are saved from options>config.
And that's the problem.
Every time I change an option the lightsrcd gets reset to one of the preset choices and I have to edit flight.cfg to put my value back in. That is why I am looking for an alternate way to set it.

[u2fly]

The LIGHTSRCD variable is in the flight.cfg file.

Yeah, LIGHTSRCD is part of flight.cfg and is NOT a part of .YFS file format.

So, the only solution could be ask Soji Yamakawa for making such variable for next versions of YSFlight.