Games Vehicle Physics Test - WIP

Hi all, i have been working on vehicle physics for a couple of weeks now.

I managed to implement the simplified pacejka tire model and some driving assists to make it a bit more playable. My aim is to have a fun to drive, arcade style vehicle implementation.

Currently i have a playable demo with a fwd car. Because of some technical problems i am having difficulty making rwd cars playable and also some of the driving assists can result weird behavior in some cases. My plan is to make further research on the pacejka model(especially about combining forces) and other models like the brush model.

I would like hear about your opinion about the current driving feel and any feedback is welcome.

 

hi, back to this about one year later, i did some improvements, the driving feel is still more arcade than simcade but better than before i think. if you could try, please post your opinions.

new demo : https://www.dropbox.com/s/zguk3hjs5dmwncc/ykcar.rar?dl=0

 

Can you show us a video?

 

sure, uploaded a short one, in the first post.

 

The whole thing feels pretty solid so far!

 

thanks man, your 3d work also looks nice.

 

Looks good! I would be interest to see off road options
Is this for a game you're making, or asset?

 

thank you, this is neither a game nor an asset for now it is only hobby.
there are still a couple of things to do on my list after then if get satisfied of the results i'll consider the asset option, if i find an artist partner i may try to turn this into a game, time will tell.

 

Anything new? Maybe stuff like an option for backfire, or a red light that goes on when you max on the revs. Small stuff

 

those are eye candy stuff, i am working on only physics for now.

whats improved since video:
-esp code rewritten, it was based on fake forces now it is applied only by brakes which is less efficient but kinda realistic.
-vehicle jittered at near zero speeds(common problem of pacejka), to avoid that lateral force calculation is changed at low speeds.
-added dynamic torque distribition between axles which helpes the rwd vehicles to recover oversteering more easily.

 

Sounds good! Sorry for the eyecandy ideas haha, artist problems eh

 

a new video and demo is uploaded(see the first post), here are the things that i have been working on:

-demo can be played with keyboard and/or xbox joypad. steering wheel support is planned.
-different differential options like open/viscous/lsd/locked. differentials are the most annoying topic for me, still need to check em out later.
-different tire models are added like pacejka94, pacejka96 & harty. harty is too simple but cheap, pacejkas require good parameter sets.
-multi ray wheels(aka 3d wheel) option is added.
-multiple axle support, previously only front&rear.
-ackerman steering is adjustable now, inverse possible.
-camber angle for wheels is added, it only works with pacejka 94&96.

...and many minor fixes, still working on it.

 

i added a short stress test video showing 50 cars at 50hz and 500hz.
the video recording adds some cpu time but still playable at 500hz.

 

i put together some assets and started testing different setups, see the latest video in the first post.

i am thinking of making an assetstore package out of this and started working on this objective. it will be focused on vehicle physics only, the extra gameplay elements will be available too except the third parties.

 

still working on final touches, different setups, documentation etc.
i am planning to release it in january and the name will be F-Gear.

here is a drift setup sample :

 

a bit more slippy but better drifts:

 

You should share your implementation of the tire on Github!

 

https://forum.unity.com/threads/fgear-vehicle-physics-released.600307/