0007217: Bad vehicles sync

(0017186)
ccw (administrator)
2012-08-02 21:59

Please explain what the problem is

(0017189)
Kernell (viewer)
2012-08-03 06:08

It does not collide with other cars. It's bad for the chase.
So is it bad for the Race gamemode, collisions occur very frequently which actually was not, it all looks like a very large ping.

In the video, all players have ping less than 100ms.

(0017191)
CoolDark (viewer)
2012-08-03 13:03

I also do not like the vehicle sync.

(0017193)
ccw (administrator)
2012-08-03 20:08

Cars travel up to 50 units a second, so a ping of 100ms will result in 5 units of lag - About one car length.

Not quite sure what we can do about that.

(0017194)
Mr.Hankey (reporter)
2012-08-03 23:08

I think in GTA4 (and possibly other mp racing games?) car positions are extrapolated to counter this issue but this obviously caused some bad side effects especially when going fast around corners. Remote players would smash the whole sidewalk while on their computer they were just edging the curbstone.

(0017196)
diegofkda (viewer)
2012-08-04 00:02

This sync is for the win... I don't understand why people complain about this, seems like these guys never played any other multi-player game with vehicles. Take a look at NFS:World.

(0017222)
MrMuLTiVaN (viewer)
2012-08-06 10:05

@diegofkda If I have some more freetime, I will show you a video, but the problem is, you can't pass a vehicle, and drive to the front position of the vehicle(like in the first video), because if you do that, the second player see that you crash into their vehicle, but you don't, you just drive in front of it

(0017223)
MrMuLTiVaN (viewer)
2012-08-06 10:06

Okay but MTA has a better sync than SA-MP :D I think we all know that

(0017225)
Kernell (viewer)
2012-08-06 11:44

> Okay but MTA has a better sync than SA-MP :D I think we all know that
It is not true, in this time. SA-MP is slightly better sync.

(0017227)
PhatLooser (reporter)
2012-08-06 15:32
edited on: 2012-08-06 15:34

Well, if SA-MP can provide per-bullet-sync, has a headshot detection and can detect cheated ammo, invulnerability and weapon bugs - yes.
Oh wait, it DOESN'T.

I think the MTA sync is at its limits, since interpolating the car position will make the cars very laggy due to different physics dependend on FPS.
Unless you solve "that" issue (the physics-on-FPS one) you won't be able to interpolate car positions correctly.
Just watch low-end computers at the race start where everybody generates smoke for the lulz. Those with a good computer simply accelerate faster.

Whats pretty cool about the current sync is, if your car is in front of the other car for you, and his car is in front of your car for the other guy. Its the kind of acceleration thats fun to watch.

(0017228)
Remi-X (viewer)
2012-08-06 15:38

"It is not true, in this time. SA-MP is slightly better sync."

Not sure if suicidal depression or just plain stupid.

(0017230)
ccw (administrator)
2012-08-06 18:26

I'll add extrapolation as a test option and see what happens

(0017231)
ccw (administrator)
2012-08-06 22:59
edited on: 2012-08-06 22:59

To test experimental vehicle extrapolation, get 4452 or later:
http://nightly.mtasa.com/mtasa-1.3-rc-4452-20120806.exe [^]

and enable this:
Settings->Advanced->Debug setting->7217 Vehicle sync

Note:
It alters the position of remote vehicles in your client only. Other players will still see you in the 'old' position (unless they have 4452 as well)

P.S. It's a client only change - No server update is required.

(0017238)
Kernell (viewer)
2012-08-07 20:55

http://www.youtube.com/watch?v=awDJIt6GfDA [^]

http://www.youtube.com/watch?v=FR6RNHcJ9ts [^]

(0017255)
MrMuLTiVaN (viewer)
2012-08-08 22:36

@ccw you just failed sir, All vehicles, except bikes, can be driving with engine-off in this version you postet sir

(0017258)
ccw (administrator)
2012-08-08 22:43

Steps to reproduce please

(0017302)
Kernell (viewer)
2012-08-16 20:04

ccw,
vehext_percent working for all clients or only for debug setting 7217?

(0017303)
ccw (administrator)
2012-08-16 20:27

It only works for client and server r4460 (or later). No debug setting is needed.

You can check if it enabled by using the client console command:
shownetstat

Issue History
Date Modified	Username	Field	Change
2012-08-02 21:30	Kernell	New Issue
2012-08-02 21:59	ccw	Note Added: 0017186
2012-08-02 22:09	x86	Status	new => feedback
2012-08-03 06:08	Kernell	Note Added: 0017189
2012-08-03 13:03	CoolDark	Note Added: 0017191
2012-08-03 20:08	ccw	Note Added: 0017193
2012-08-03 23:08	Mr.Hankey	Note Added: 0017194
2012-08-03 23:09	LooooP	Note Added: 0017195
2012-08-03 23:09	LooooP	Note Edited: 0017195
2012-08-03 23:57	ccw	Note Deleted: 0017195
2012-08-04 00:02	diegofkda	Note Added: 0017196
2012-08-06 10:05	MrMuLTiVaN	Note Added: 0017222
2012-08-06 10:06	MrMuLTiVaN	Note Added: 0017223
2012-08-06 11:44	Kernell	Note Added: 0017225
2012-08-06 15:32	PhatLooser	Note Added: 0017227
2012-08-06 15:34	PhatLooser	Note Edited: 0017227
2012-08-06 15:38	Remi-X	Note Added: 0017228
2012-08-06 18:26	ccw	Note Added: 0017230
2012-08-06 22:59	ccw	Note Added: 0017231
2012-08-06 22:59	ccw	Note Edited: 0017231
2012-08-07 20:55	Kernell	Note Added: 0017238
2012-08-08 12:45	_Spanish4Life	Note Added: 0017240
2012-08-08 17:02	ccw	Note Deleted: 0017240
2012-08-08 22:36	MrMuLTiVaN	Note Added: 0017255
2012-08-08 22:43	ccw	Note Added: 0017258
2012-08-16 20:04	Kernell	Note Added: 0017302
2012-08-16 20:27	ccw	Note Added: 0017303

Notes
(0017186) ccw (administrator) 2012-08-02 21:59	Please explain what the problem is

(0017189) Kernell (viewer) 2012-08-03 06:08	It does not collide with other cars. It's bad for the chase. So is it bad for the Race gamemode, collisions occur very frequently which actually was not, it all looks like a very large ping. In the video, all players have ping less than 100ms.

(0017191) CoolDark (viewer) 2012-08-03 13:03	I also do not like the vehicle sync.

(0017193) ccw (administrator) 2012-08-03 20:08	Cars travel up to 50 units a second, so a ping of 100ms will result in 5 units of lag - About one car length. Not quite sure what we can do about that.

(0017194) Mr.Hankey (reporter) 2012-08-03 23:08	I think in GTA4 (and possibly other mp racing games?) car positions are extrapolated to counter this issue but this obviously caused some bad side effects especially when going fast around corners. Remote players would smash the whole sidewalk while on their computer they were just edging the curbstone.

(0017196) diegofkda (viewer) 2012-08-04 00:02	This sync is for the win... I don't understand why people complain about this, seems like these guys never played any other multi-player game with vehicles. Take a look at NFS:World.

(0017222) MrMuLTiVaN (viewer) 2012-08-06 10:05	@diegofkda If I have some more freetime, I will show you a video, but the problem is, you can't pass a vehicle, and drive to the front position of the vehicle(like in the first video), because if you do that, the second player see that you crash into their vehicle, but you don't, you just drive in front of it

(0017223) MrMuLTiVaN (viewer) 2012-08-06 10:06	Okay but MTA has a better sync than SA-MP :D I think we all know that

(0017225) Kernell (viewer) 2012-08-06 11:44	> Okay but MTA has a better sync than SA-MP :D I think we all know that It is not true, in this time. SA-MP is slightly better sync.

(0017227) PhatLooser (reporter) 2012-08-06 15:32 edited on: 2012-08-06 15:34	Well, if SA-MP can provide per-bullet-sync, has a headshot detection and can detect cheated ammo, invulnerability and weapon bugs - yes. Oh wait, it DOESN'T. I think the MTA sync is at its limits, since interpolating the car position will make the cars very laggy due to different physics dependend on FPS. Unless you solve "that" issue (the physics-on-FPS one) you won't be able to interpolate car positions correctly. Just watch low-end computers at the race start where everybody generates smoke for the lulz. Those with a good computer simply accelerate faster. Whats pretty cool about the current sync is, if your car is in front of the other car for you, and his car is in front of your car for the other guy. Its the kind of acceleration thats fun to watch.

(0017228) Remi-X (viewer) 2012-08-06 15:38	"It is not true, in this time. SA-MP is slightly better sync." Not sure if suicidal depression or just plain stupid.

(0017230) ccw (administrator) 2012-08-06 18:26	I'll add extrapolation as a test option and see what happens

(0017231) ccw (administrator) 2012-08-06 22:59 edited on: 2012-08-06 22:59	To test experimental vehicle extrapolation, get 4452 or later: http://nightly.mtasa.com/mtasa-1.3-rc-4452-20120806.exe [^] and enable this: Settings->Advanced->Debug setting->7217 Vehicle sync Note: It alters the position of remote vehicles in your client only. Other players will still see you in the 'old' position (unless they have 4452 as well) P.S. It's a client only change - No server update is required.

(0017238) Kernell (viewer) 2012-08-07 20:55	http://www.youtube.com/watch?v=awDJIt6GfDA [^] http://www.youtube.com/watch?v=FR6RNHcJ9ts [^]

(0017255) MrMuLTiVaN (viewer) 2012-08-08 22:36	@ccw you just failed sir, All vehicles, except bikes, can be driving with engine-off in this version you postet sir

(0017258) ccw (administrator) 2012-08-08 22:43	Steps to reproduce please

(0017302) Kernell (viewer) 2012-08-16 20:04	ccw, vehext_percent working for all clients or only for debug setting 7217?

(0017303) ccw (administrator) 2012-08-16 20:27	It only works for client and server r4460 (or later). No debug setting is needed. You can check if it enabled by using the client console command: shownetstat

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