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View Full Version : [INVESTIGATING] Levitating Cars Post Patch 2.0 PS4



BaSsMaNLoFtY
07-07-2015, 22:10
First and formeost I would just like to say Thank you to SMS for making the racing game I have wanted for 10 plus years. Finally a very competent sim racer on consoles not watered down for the NFS crowd.

I can't remember the last game I ever played for 100 hours let alone within such a short period of time.

I am a little embarrassed that a game I have followed for years, I have have only just signed up to the forums.

The main reason for signing up was to share a serious bug which seemed to appear post patch 2.0on PS4.

I posted this glitch on the racing league forum I race in and unbelievably someone else post the exact same glitch on the same track and same corner.

Here are the videos to help describe the bug. First one is mine, second is another forum user.


http://youtu.be/-pJVm7op7rQ


https://www.youtube.com/watch?v=RrKfocbgIuY

I hope this can be highlighted to Ian and the team. If more information is needed please let me know.

J.P.Montoya
07-07-2015, 22:18
Now I want the official WEC season, so I can fly using Mark Webber

Umer Ahmad
07-07-2015, 23:07
Hmmm escalating

c172fccc
07-07-2015, 23:26
Looks like a collision/physx issue to me.

BaSsMaNLoFtY
08-07-2015, 09:07
At first I thought I had run over a corner marker and it got stuck under the car, however you can clearly see I haven't, and the other video shows the same issue. Hopefully it is only a physics issue with Silverstone similar to the 'invisible wall' glitches in F1 2011(?).

As noted, any more info needed just PM me.

Mike Laskey
08-07-2015, 09:12
Maybe linked to the life time of the tyres? Needs adding to Jira for physics team please (see also http://forum.projectcarsgame.com/showthread.php?34293-INVESTIGATING-Grand-Prix-Length-Formula-A-race-problem&p=1035607&viewfull=1#post1035607)

BaSsMaNLoFtY
08-07-2015, 09:26
Maybe linked to the life time of the tyres? Needs adding to Jira for physics team please (see also http://forum.projectcarsgame.com/showthread.php?34293-INVESTIGATING-Grand-Prix-Length-Formula-A-race-problem&p=1035607&viewfull=1#post1035607)

In my video (first), I had pitted on lap 11 from softs to hard tyres. The glitch then happened on lap 27 of 28. Maybe this can help narrow down the issue. We were using x2 tyre wear as patch 2.0 has dramatically changed tyre wear.

Doug914
08-07-2015, 11:51
I'm pretty sure it's related to you blowing one of the tires at that point from excessive tire wear. Then there's a weird interaction with the collison/physics of the ground. Pre patch it was very hard to ever pop a tyre becuase the wear was too weak. So this would explain why post patch it's showing up. My guess anyways.

chig88
08-07-2015, 14:18
I'm pretty sure it's related to you blowing one of the tires at that point from excessive tire wear. Then there's a weird interaction with the collison/physics of the ground. Pre patch it was very hard to ever pop a tyre becuase the wear was too weak. So this would explain why post patch it's showing up. My guess anyways.

I had a very similar issue during a long stint in the M1 Procar at Willow Springs Int. Did around 20 laps on one set of tyres (temperatures were still green, car driving normally, no significant loss of grip), & suddenly the car just half-flipped at the left hander at the start of the second sector.

As bassman says, it really looked as though I'd ran over something & it was stuck under the car, but even with the brakes fully on & no throttle the car was still moving (pulling slowly left in a tight circle & rocking up and down) & floating above the track slightly.

I revved the nuts off it for about a minute (thinking something was stuck under the car) and eventually the car just settled back onto the track and I was able to drive again as normal. No popped tyres, car handling exactly as it should. It was very weird & hasn't happened before or since.

Also worth mentioning that this was the day before the 2.0 patch released on the PS4, so I don't think the issue is specific to this update.

wyldanimal
08-07-2015, 15:45
First and formeost I would just like to say Thank you to SMS for making the racing game I have wanted for 10 plus years. Finally a very competent sim racer on consoles not watered down for the NFS crowd.

I can't remember the last game I ever played for 100 hours let alone within such a short period of time.

I am a little embarrassed that a game I have followed for years, I have have only just signed up to the forums.

The main reason for signing up was to share a serious bug which seemed to appear post patch 2.0on PS4.

I posted this glitch on the racing league forum I race in and unbelievably someone else post the exact same glitch on the same track and same corner.

Here are the videos to help describe the bug. First one is mine, second is another forum user.


http://youtu.be/-pJVm7op7rQ


https://www.youtube.com/watch?v=RrKfocbgIuY

I hope this can be highlighted to Ian and the team. If more information is needed please let me know.


I'm pretty sure it's related to you blowing one of the tires at that point from excessive tire wear. Then there's a weird interaction with the collison/physics of the ground. Pre patch it was very hard to ever pop a tyre becuase the wear was too weak. So this would explain why post patch it's showing up. My guess anyways.

In the first video at 1:00, I didn't notice a tire blow out.. and at 1:36 still didn't look like a tire blow out.
But I'd have to agree with the Collision/Physics with the ground.

Very Similar to the LandMine Collisions, which again has to do with the ground.
I haven't experienced the Levitating car glitch myself.
But I have had the landmine issue about a dozen times.

issues like this are very difficult to trace..

chig88
08-07-2015, 16:18
I had a very similar issue during a long stint in the M1 Procar at Willow Springs Int. Did around 20 laps on one set of tyres (temperatures were still green, car driving normally, no significant loss of grip), & suddenly the car just half-flipped at the left hander at the start of the second sector.

As bassman says, it really looked as though I'd ran over something & it was stuck under the car, but even with the brakes fully on & no throttle the car was still moving (pulling slowly left in a tight circle & rocking up and down) & floating above the track slightly.

I revved the nuts off it for about a minute (thinking something was stuck under the car) and eventually the car just settled back onto the track and I was able to drive again as normal. No popped tyres, car handling exactly as it should. It was very weird & hasn't happened before or since.

Also worth mentioning that this was the day before the 2.0 patch released on the PS4, so I don't think the issue is specific to this update.

Just got home & watched the OP's videos - the 2nd video is almost exactly what happened to me.

Obviously it isn't just Silverstone & it wasn't only after the 2.0 patch - mine was at Williow Springs & before the patch.

BaSsMaNLoFtY
09-07-2015, 09:52
I can say it wasn't a blown tyre as it was my first thought, and the reason I looked around the car. Tyres wear not worn enough for me to be anywhere near the limit.

stiften
09-07-2015, 13:36
Don't know if it's the same problem, but I recently had a freakish flip in multiplayer. Here's the video:
http://www.youtube.com/watch?v=1rt0ufD9XQ4
Let me know if anyone needs more info. Hope this helps!

medse87
15-07-2015, 00:00
Here is mine. Lap 19 of an endurance race in Brands Hatch GP with 2x tire wear. The debris in the clip is from my car. It just stayed there after rewinding.


https://www.youtube.com/watch?v=AFRV8UAiP1o

Something similar happened last night to many of our members, including me, at MatsuoRacing during our Group A tournament.

medse87
16-07-2015, 11:33
https://www.youtube.com/watch?v=M4GQ_oY5f4I

another example.

Silverstone GP
normal tire wear
light rain
lap 12 of 15

rocafella1978
16-07-2015, 16:41
In the first video at 1:00, I didn't notice a tire blow out.. and at 1:36 still didn't look like a tire blow out.
But I'd have to agree with the Collision/Physics with the ground.

Very Similar to the LandMine Collisions, which again has to do with the ground.
I haven't experienced the Levitating car glitch myself.
But I have had the landmine issue about a dozen times.

issues like this are very difficult to trace..

post 2.0 patch there was a landmine or maybe still is (PS4), we hit it in MP session on track Imola in the chicane right after start and finish, launched Z4 of a friend into the air like a rocket, will see if we can reproduce it (might be fixed too with patch 2.0)...will find out. (so between turn 2 & 3, variante tamburello) just on kurbs or after kurbs in gravel.

Fight-Test
16-07-2015, 16:50
had this happen again last night at silverstone in the middle of track. I was leading in a 30 laps race and bam! held me up for about 30 secs. I was spinning on my trunk as traffic came by. First time at that track it happened to me.

stiften
18-07-2015, 09:27
Let me add this spectacular flip to the gallery:

https://www.youtube.com/watch?v=5AE3SnWgzk8

No chance to continue after this. Luckily this was in training session. :D

medse87
22-07-2015, 12:00
it happened again and let me like a turtle on its back laying there helpless after 12 laps of watkins glen.

LPlates
22-07-2015, 12:49
This was posted by one of the guys in my PS4 Championship.


End of lap 16, coming out of Clearways it all goes a bit Pete Tong.


https://www.youtube.com/watch?v=WXfFgIPJTFM

wyldanimal
22-07-2015, 14:35
I don't know if the "landmine issue" and the levitating car issue are caused by the same anomaly.
They both seem to be related to the collision physics with the ground.
So they might be one in the same cause.

I've never had the Levitation anomaly, but experience the landmine a couple times a week.
it happens at various tracks, and I can't say that it's a particular Location.
Example, on Leguna Seca, I've had it happen on the 2nd lap, just after crossing the start finish Line..
then at a different time, on the same track, it happened right after the downhill esses..

I've had it happen on Bathurst in the middle of the Esses.
In fact I think it's happened on most all the tracks I've tried..

So too me, it seems to be more of a random occurrence, not specific to track locations.

I wrote in another post, that the track condition is not static, but it's actively changing.
the amount of grip or friction on the track surface changes over time, temperature, weather..

Maybe there is a calculation that at some instant, is producing some very large Force factor, "landmine"
or very small force "levitation", But you just have to be on the track at the right instant when that value gets calculated.

If there is such a calculation, then perhaps, some Min and or Max constraints need to be checked, and applied.


and while on the topic of Collision Physics.
I think the Car to Car Physics are still a bit too strong.
Often there seem to be a GLUE or Entanglement Effect that is much too exaggerated too often..
Yes, in real racing, cars can get tangled or stuck together...
But the frequency of this in the game, happens much too often.
IRL, Most of the time a bump or rub will result in the cars separating, Not getting stuck together.

think of billiards or pool balls.

You Put the white Cue ball into motion, It collides with One of the Other Balls.
The Cue Ball transfers it's Energy Into the Other Ball.
The Cue ball stops or Looses it's Motion, and the Other Ball Moves away and Gains motion.

This is true of two objects with similar mass..

One Mass transfers it's Energy, and Decreases it's Motion, while the other Mass Absorbs the Energy, and increases it Motion.

of course cars have sheet metal, that deforms and energy is lost to this deformation.
and there is potential for entanglement of the body parts.
But I think it happens too often in the game..

LPlates
22-07-2015, 15:01
For me the "Land Mine" and the "Harry Potter" as it is referred to in my championship are very different.

One is striking some invisible object that in a lot of cases sheds your bodywork.
The other sees the car suddenly but gently float up off the track and roll over upon the slightest turn.

wyldanimal
22-07-2015, 18:18
For me the "Land Mine" and the "Harry Potter" as it is referred to in my championship are very different.

One is striking some invisible object that in a lot of cases sheds your bodywork.
The other sees the car suddenly but gently float up off the track and roll over upon the slightest turn.

yes, true the Symptom or experience is different, but the root cause could be the same..

Grip or Collision physics with the ground.

One is the result of Extremely High grip. ( Car Sucked into the ground )

the other could be Negative Grip.. ( Car floats off ground, pushed into the air )

as an example:
a Tangent function without upper and lower bounds could result in such, as it quickly approaches infinitely High values, both Positive and Negative.

it happens suddenly... one instant you have normal grip / driving, the Next instant you Crash or Float.

So what changes? what causes it?
just trying to look at it from a programmatic perspective.
what background code could be responsible for the anomaly?

stevemontuno
22-07-2015, 18:37
was on my 2nd lap of Spa the other night when my car just decided to do a flip at top speed for no reason,,lol

medse87
24-07-2015, 11:34
http://www.twitch.tv/jahhve/v/8332058

fast forward to 41:00

medse87
29-07-2015, 14:58
Again. Any news on this. I bugged out in 3 out of 8 races in our tournament.

at 13:50

https://www.youtube.com/watch?v=YE814syMSTw

flatspunout
30-07-2015, 17:25
Back to back league races Tuesday night:


https://www.youtube.com/watch?v=On9rt8A3YkY

https://www.youtube.com/watch?v=lbxhL5KRq4E

medse87
31-07-2015, 11:23
great examples @flatspunout

I have a new one too

https://www.youtube.com/watch?t=26&v=ql_5eBNC3Io

BaSsMaNLoFtY
19-08-2015, 17:37
Any updates on this issue?

medse87
25-08-2015, 10:31
Seems to be still a thing.

Donington National
Free Practice Session
Tire wear 2x
GT3
after approx 20 laps on soft tires
PS4


https://www.youtube.com/watch?v=0XaVGba-T-k

medse87
25-08-2015, 11:29
the FP session was only the beginning.

lap 24 on rain tires
tire wear 2x
GT3
Donington
Random weather

jump to 9:50


https://www.youtube.com/watch?v=xuQ1v62ofRg

medse87
25-08-2015, 11:53
This is the last problem I have with the game. Some words from the Devs would be great. I'm loving the game. Keep up the good work.