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At the start the car is very, very slowly rolling. Over time it very slowly turns also. If left for about 10 minutes it's 30 degrees or more from its original heading. This is pretty realistic of the game to roll the car because of the slight incline, but I think at the start it should just sit there still until the driver's ready to go. Perhaps set the brake on until the player uses the accelerator?
Needs a real racing start...
Yep. I can do a model for this if you like...it will be rather simple.After leaving the car there for 79 minutes it has now turned about 200 degrees and still going. I don't know how it continues rolling forward, now that it's facing uphill...
Probably just round-off error due to floating point calculations. This could be improved by moving to a smaller time step, but I don't think the tradeoff is worth it....
This effect has been drastically reduced by having hinges in the right place (instead of the wrong place). Smile