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Old 01-09-2008, 06:42 AM
theuberk theuberk is offline
Join Date: Jul 2007
Posts: 44
inheritence question


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" )
			self.tempCar = viz.add( "cars\car_0" + str(randomCar) + ".ive" )
		viz.VizNode.__init__( self, )
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:
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:

car = Car()
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?
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Old 01-09-2008, 04:10 PM
farshizzo farshizzo is offline
WorldViz Team Member
Join Date: Mar 2003
Posts: 2,849
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')

import viz

c = Car()
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Old 01-10-2008, 06:49 AM
theuberk theuberk is offline
Join Date: Jul 2007
Posts: 44
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' )
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Old 01-10-2008, 07:01 AM
theuberk theuberk is offline
Join Date: Jul 2007
Posts: 44
Sorry I forgot, I also had to change the name of the ID parameter in the constructor. It must have been scope problems with or something..
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