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SuperSonic speed, when ~230km/h with vehicle heading in a specific direction
Assigned, NormalPublic

Description

Hello,

We have found a very major bug in the physics engine.
If you hit around 230km/h in a certain direction. It's will give you a supersonic speed.

It only happens if you face a specific direction.

In Expansion, most of our helicopters go over this km/h, so the bug happens every time.

This is a link to the video, to show the bug: https://streamable.com/g5qmv5

Details

Severity
Major
Resolution
Open
Reproducibility
Always
Operating System
Windows 10 x64
Category
Engine
Steps To Reproduce

This is the PBO that should be loaded. It's just over-boost the performance of the hatchback so you can hit the 230km/h.

Just do in Chernarus

GetGame().GetPlayer().SetPosition("13384.2 5.98 5289")

Spawn the hatchback on the road, and go toward North, so Berezino.

And you will see you will be stopped around 230km/h, and when you will not touch the ground anymore, you will see an amazing supersonic speed.

Additional Information

If you test to go to the south with the vehicle., instead of the north, you will see the bug doesn't occur and you can go over 300 km/h.

Event Timeline

NiiRoZz created this task.Apr 23 2020, 2:37 PM
Camino added a subscriber: Camino.Apr 23 2020, 2:37 PM

Yes as said above, we're forced to limits helicopters to go bellow that speed due to this bug

Alda added a subscriber: Alda.Apr 23 2020, 2:41 PM
Jest added a subscriber: Jest.Apr 23 2020, 4:13 PM
Jacob_Mango added a comment.EditedApr 24 2020, 8:30 AM

There exists some code in the game that means that if the vehicles forward direction is within some small delta of "0 0 1" (North) and exceeding 60m/s (~230km/h) then the vehicle will seem to no longer have any friction/drag applied on it.

This happens even if the wheels and body are not on the ground.

This behaviour does not happen if the vehicles forward is facing any other direction.

Geez changed the task status from New to Assigned.Apr 24 2020, 11:25 AM

This can most likely be reproduced if the server were to freeze for half a second (server fps drops to 20) and you were to already be travelling at 100km/h going north.