[Bird]

What's also interesting is that there was only one hit for me during that whole incident, when I've frontally met Jeremy.
There was nothing involving Grat & me.  If it has registered, that's again lag/netcode issue.

I'm also wondering how does the program attribute the crash to a side.  It seems to be doing a poor job of who hit whom in a lot of cases.

[marty]

You need to look at all 3 of the lap 8 contacts, not sure if its seperated by time code or location with those numbers 225,250 275,250 and 250,250.

It shows the collision between Jeremy/Grat, Jeremy/Bird and Bird/Grat. It doesnt lay blane in any way just records the speed of contact as seen by each client. These should be quite similar but at times due to netcode and warps it may register 1 client at a very different speed to the other.

[Wally]

I reported this on the AC forums after watching the replay closely too: http://www.assettocorsa.net/forum/index.php?threads/collision-speeds-reported-by-server-are-very-wrong-maybe-giving-exaggerated-collisions.31029/

"I wonder if this is causing the exaggerated, billiard ball, inelastic collisions we often see, that look completely unrealistic. E.g. if a car hits another at 20 kph, and the server thinks the collision was at 172 kph, is it any wonder the car will go flying off after what looks like a minor collision?"

[Wally]

What's also interesting is that there was only one hit for me during that whole incident, when I've frontally met Jeremy.
There was nothing involving Grat & me.  If it has registered, that's again lag/netcode issue.

I'm also wondering how does the program attribute the crash to a side.  It seems to be doing a poor job of who hit whom in a lot of cases.

I looked at that incident too, in slomo. I think you did just graze Grat.

[Simone]

I reported this on the AC forums after watching the replay closely too: http://www.assettocorsa.net/forum/index.php?threads/collision-speeds-reported-by-server-are-very-wrong-maybe-giving-exaggerated-collisions.31029/

"I wonder if this is causing the exaggerated, billiard ball, inelastic collisions we often see, that look completely unrealistic. E.g. if a car hits another at 20 kph, and the server thinks the collision was at 172 kph, is it any wonder the car will go flying off after what looks like a minor collision?"

can we shift to another simrace?   this is crap   

[Wally]

Here's an improved contact log, which bunches up the reports into separate incidents (i.e. chains of collisions all at the same time). the number at the front is the TCP packet number, so if a whole bunch of TCP collision packets come together in sequence, they're likely to all be at the same time, more or less.

Session: Race - Race 1 (15 laps)


Lap: 1
--------------------------
920: Jeremy [Struggle Street Racing Crew] hit Bird [TKO Racing] at 9 kph.
920: Jeremy [Struggle Street Racing Crew] hit Grat [DA Racing] at 23 kph.
921: Grat [DA Racing] hit Jeremy [Struggle Street Racing Crew] at 38 kph.
922: Bird [TKO Racing] hit Jeremy [Struggle Street Racing Crew] at 30 kph.
922: Bird [TKO Racing] hit Grat [DA Racing] at 143 kph.
923: Freezer [Caterpillar Racing] hit Wally [TKO Racing] at 188 kph.
923: Freezer [Caterpillar Racing] hit Jeremy [Struggle Street Racing Crew] at 103 kph.
924: Jeremy [Struggle Street Racing Crew] hit Freezer [Caterpillar Racing] at 113 kph.
924: Jeremy [Struggle Street Racing Crew] hit Grat [DA Racing] at 71 kph.
925: Grat [DA Racing] hit Bird [TKO Racing] at 206 kph.
925: Grat [DA Racing] hit Jeremy [Struggle Street Racing Crew] at 91 kph.
926: Wally [TKO Racing] hit Freezer [Caterpillar Racing] at 172 kph.
926: Wally [TKO Racing] hit christopheraser at 90 kph.
927: christopheraser hit Wally [TKO Racing] at 45 kph.
927: christopheraser hit Doobs at 126 kph.
928: Bafs17 [Italia Racing] hit Doobs at 115 kph.
928: Bafs17 [Italia Racing] hit AJ at 99 kph.
929: Bird [TKO Racing] hit Grat [DA Racing] at 54 kph.
930: Doobs hit Gratulin at 129 kph.
930: Doobs hit christopheraser at 106 kph.
930: Doobs hit Bafs17 [Italia Racing] at 112 kph.
930: Doobs hit Freezer [Caterpillar Racing] at 61 kph.
931: Gratulin hit Doobs at 72 kph.
932: AJ hit Bafs17 [Italia Racing] at 93 kph.
933: Freezer [Caterpillar Racing] hit Doobs at 60 kph.
935: Wally [TKO Racing] hit Rob at 57 kph.
936: Rob hit Wally [TKO Racing] at 67 kph.

Lap: 2
--------------------------
970: Jeremy [Struggle Street Racing Crew] hit Grat [DA Racing] at 52 kph.
971: Grat [DA Racing] hit Jeremy [Struggle Street Racing Crew] at 3 kph.

Lap: 4
--------------------------
1021: Wally [TKO Racing] hit christopheraser at 14 kph.

Lap: 8
--------------------------
1137: Jeremy [Struggle Street Racing Crew] hit Bird [TKO Racing] at 239 kph.
1137: Jeremy [Struggle Street Racing Crew] hit Grat [DA Racing] at 78 kph.
1138: Grat [DA Racing] hit Jeremy [Struggle Street Racing Crew] at 59 kph.
1138: Grat [DA Racing] hit Bird [TKO Racing] at 80 kph.
1140: Bird [TKO Racing] hit Grat [DA Racing] at 81 kph.
1140: Bird [TKO Racing] hit Jeremy [Struggle Street Racing Crew] at 218 kph.

Lap: 11
--------------------------
1245: christopheraser hit Mael [Maelstrom Racing] at 43 kph.

Lap: 12
--------------------------
1250: christopheraser hit Bafs17 [Italia Racing] at 54 kph.
1251: Bafs17 [Italia Racing] hit christopheraser at 23 kph.

Lap: 15
--------------------------
1321: StanDaam [Golden Goat Gatherers] hit Paul [Krahl Racing] at 23 kph.
1322: Paul [Krahl Racing] hit StanDaam [Golden Goat Gatherers] at 35 kph.

[Guybrush Threepwood]

I personally think the collisions aren't that bad.  There's nothing I've seen in replays that looks physics defying, despite what the log reports.  Maybe someone can point it out to me?

[Bird]

Thanks Wally - indeed there seems to be a tiny overlap there. 
It's really interesting to see these; neither in the race or on my saved replays I could see any contact there.  And the same for the T1 accident, even though the server logs seem to register a 'hit' between me and Jeremy.   

My lag is negligible, so I'm really wondering how these things come to be.


I'd like to try and see these situations better on my replay, how do you guys move the cameras to these ad-hoc positions and angles?
Edit; nevermind, found it.  After some careful looking, I can find these contacts.  Funny, I have not heard nor felt them during the race. 
But it's also interesting that some of these contacts are pretty much happening outside of the cars.  Eg the original Jeremy/Grat incident. 
I'll create a screenshot of the moment where it happens.

Here's the moment of contact: