[farshizzo]

I tried your script but there were some errors with it. I fixed the errors and it works for me now. Can you try the following code:

import viz
viz.go()

#Changing the background color to SKYBLUE
viz.clearcolor(0.5,0.5,1)

#Defining the move and the turn speeds
MOVE_SPEED = 5
TURN_SPEED = 60

#Adding the objects to the world
ground = viz.add('tut_ground.wrl')
car = viz.add('mini.osgx')

#Getting main viewpoint object
view = viz.get(viz.MAIN_VIEWPOINT)

def mytimer(num):
    
    if viz.iskeydown(viz.KEY_UP):
        view.move(0,0,MOVE_SPEED*viz.elapsed(),viz.BODY_ORI)
    elif viz.iskeydown(viz.KEY_DOWN):
        view.move(0,0,-MOVE_SPEED*viz.elapsed(),viz.BODY_ORI)
        
    if viz.iskeydown(viz.KEY_RIGHT):
        view.rotate(0,1,0,TURN_SPEED*viz.elapsed(),viz.BODY_ORI,viz.RELATIVE_WORLD)
    elif viz.iskeydown(viz.KEY_LEFT):
        view.rotate(0,1,0,-TURN_SPEED*viz.elapsed(),viz.BODY_ORI,viz.RELATIVE_WORLD)

    updatecar()
    
def updatecar():
  car.translate(view.get(viz.HEAD_POS))
  car.rotate(view.get(viz.BODY_AXISANGLE))
  car.translate(0.35,-1.2,0.2,viz.RELATIVE_LOCAL)
#def updatecar():
#    car.translate(view.get())
#    car.rotate(view.getAxisAngle(viz.BODY_ORI))
#    car.translate(0.35,-1.2,0.2,viz.RELATIVE_LOCAL)
    
def mousemove(e):
    #euler = view.getEuler(viz.HEAD_ORI)
    euler = view.get(viz.HEAD_EULER)
    euler[0] += e.dx*0.1
    euler[1] += -e.dy*0.1
    euler[1] = viz.clamp(euler[1],-90.0,90.0)
    view.rotate(euler,viz.HEAD_ORI)

def mousedown(button):
    if button == viz.MOUSEBUTTON_LEFT:
        view.reset(viz.HEAD_ORI)
    elif button == viz.MOUSEBUTTON_RIGHT:
        view.reset(viz.BODY_ORI|viz.HEAD_POS)
        updatecar()


viz.callback(viz.TIMER_EVENT,mytimer)
viz.starttimer(0,0.01,viz.FOREVER)

viz.callback(viz.MOUSE_MOVE_EVENT,mousemove)

viz.setMouseOverride()
viz.cursor(viz.OFF)

viz.callback(viz.MOUSEBUTTON_EVENT,mousedown)

viz.mouse(viz.OFF)
viz.restrictmouse(viz.ON)