Wheel& create(Actor &vehicle,Matrix &matrix,Param &param); // create, 'vehicle'=vehicle actor to attach the wheel to, 'matrix'=wheel matrix in world space (must be normalized), 'param'=wheel parameters

when you load the vehicle it has different world matrix,

try something like this

Matrix().setPos(Vec( 1,-0.7, 1.9)) * actor.matrix()

Ok it works now properly.

Can I save and load Bools using f>> and f<< or better way is f.putBool(x) x=f.getBool(); ?

yes, Bool's are of constant size (always 8-bits), and can be saved loaded with << and >>

Ok thanks.