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?

[farshizzo]

Can you provide a minimal working sample that reproduces the problem? The following code works for me:

class Car(viz.VizNode):
	def __init__(self):
		
		model = viz.add('mini.osgx')
		
		viz.VizNode.__init__(self,model.id)


import viz
viz.go()

c = Car()
c.setPosition(0,0,10)
c.setEuler(180,0,0)
c.addAction(vizact.spin(0,1,0,90))

[theuberk]

Alright I figured out the problem. It had to do with getting a child object from the model that was imported as a "car". This was code that was in the constructor that I didn't include in my previous post because I didn't think it was important (oops.):

self.frontWheels = self.tempCar.getChild( '0' + str(randomCar) + 'tyresBack-OFFSET' )
self.backWheels = self.tempCar.getChild( '0' + str(randomCar) + 'tyresFront-OFFSET' )

this needed to be changed to:

self.frontWheels = self.getChild( '0' + str(randomCar) + 'tyresBack-OFFSET' )
self.backWheels = self.getChild( '0' + str(randomCar) + 'tyresFront-OFFSET' )

[theuberk]

Sorry I forgot, I also had to change the name of the ID parameter in the constructor. It must have been scope problems with tempcar.id or something..