Vehicle skid marks and tire smoke

[Shaderman]

Hi.

I'd like to add skid marks and tire smoke. I don't see how to get the necessary information like wheel lock-up and wheelspin in Newton. Do you guys have any suggestions please?

Thanks

Shaderman

[Slick]

My guess would be to monitor the omega of the wheel to determine if it is spinning faster or slower than it should be for the speed of the vehicle.

[Shaderman]

Ouch, I thought I replied already

Thanks for your idea Slick. I had some success already weeks ago, but don't have the time to continue with my Newton project currently.

[Julio Jerez]

you can iterate over the tire list using

Code: Select all

dList<BodyPartTire>::dListNode* GetFirstTire() const;
dList<BodyPartTire>::dListNode* GetNextTire (dList<BodyPartTire>::dListNode* const tireNode) const;

then each tire you can read

Code: Select all

dFloat GetLateralSlip () const;
dFloat GetLongitudinalSlip () const;


you need to sync to get that interface.

the parameter measure how much the tire are slipping relation for the vehicle velocity.
for -1.0 to 1.0

a value of zero mean the vehicle is rolling with not slip, this is rare since all vehicle tire model are adhoke, meaning you nee slip in order to move, but motion opposes the slip

you can clip the value a 0.5 and assume that a slip value less than 0.5 is normal, after that the tire is sliding and can produce sound, skid mark, etc.

[Shaderman]

Thanks a lot Julio, will try it once i have some spare time again.