i don't know what to put under upDir...???
NewtonConstraintCreateVehicle (const NewtonWorld* newtonWorld, const dFloat* upDir, const NewtonBody* body);


my code goes...
...
car = ent_create("car.mdl", camera.x, NULL);
NewtonBody *car_body = newton_addentity(car, 10, NEWTON_CONVEXHULL, onforceandtorque);
car_body = NewtonConstraintCreateVehicle (n_world, ""0"", car);
...

can someone please help? with what should i replace ""0"" part of my code???


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