inheritence question

[theuberk]

Hi,

I'm trying to make custom class called car a subclass of the VizNode class, but I'm having a few problems. Here is the main part of my constructor for the car class:

class Car(viz.VizNode):
	
	def __init__(self, direction = "right", id = sys.carID):
		
		randomCar = random.randint(1,14)
		
		if (randomCar == 10):
			randomCar += 1	
		if (randomCar > 10):
			self.tempCar = viz.add( "cars\car_" + str(randomCar) + ".ive" )
		else:
			self.tempCar = viz.add( "cars\car_0" + str(randomCar) + ".ive" )
		
		viz.VizNode.__init__( self, self.tempCar.id )

The problem lies in that I cannot seem to manipulate any of the fields present in the VizNode class from outside the car class. For example:

If I add the following code to the car constructor:

self.tempCar.collideBox()
self.tempCar.setVelocity([10,0,0])

the car will fall and move along the x-axis at 10units/s

however, if I type the following code outside of the car class:

viz.go()
viz.phys.enable()
car = Car()
car.collideBox()
car.setVelocity([100,0,0])

I get the following error:

Cannot collideBox with invalid bounding box

collideBox is not the only method that does not work. I've also tried methods like car.setPosition(10,0,0) which also does not do anything.

Any ideas?