WorldViz User Forum - Collision of two boxes

I'm trying to figure out how to improve some old code by using classes. The current situation is that I try to collide two boxes (box1 and box2) and after collision, box2 should change color. Now I can get this working by calling e.obj1.color() in the collide function, but I would like to use the change_color() function I defined in the class. My question is why e.obj1.change_color() doesn't work. As I see it, e.obj1 refers to box2, which is an instance of the class make_box(). But when I print e.obj1, I get something different than when I print box2, indicating that they are not the same. So I think the problem is in how the collide function works, but I don't know how to get e.obj1 to work with the method I defined for box2. See below for my code. The keys w, a, s, d move box1 around, to be able to collide with box2.

Code:

import viz

import random



viz.go()



viz.add('gallery.ive')

viz.phys.enable()



class make_box:

        def __init__(self, pos, name):

                self.obj = viz.add('box.wrl')

                self.obj.setPosition(pos)

                self.obj.name = name

                self.obj.scale([.1]*3)

                self.obj.color(viz.WHITE)

                self.obj.collideBox()

                self.obj.disable(viz.DYNAMICS)

                self.obj.enable(viz.COLLIDE_NOTIFY)

                

        def change_color(self):

                color = random.choice( [viz.RED,viz.GREEN,viz.SKYBLUE,viz.YELLOW,viz.ORANGE,viz.PURPLE] )

                self.obj.color(color)

                

global x, y ,z, box1, box2

x = 0

y = 0

z = 0



box1 = viz.add('box.wrl')

box1.name = 'test!'

box1.scale([.1,.1,.1])

box1.collideBox()

box1.disable(viz.DYNAMICS)



box2 = make_box([0,.30,0], 'Left')

print box2



def onKeyboardEvent(key):

        global box1, box2, x, y, z

        if key in 'wW':

                y = y+.1

        

        elif key in 'aA':

                x = x - .1

                

        elif key in 'sS':

                y = y - .1

        

        elif key in 'dD':

                x = x + .1

        

        elif key == viz.KEY_PAGE_UP:

                z = z + .1

        

        elif key == viz.KEY_PAGE_DOWN:

                z = z - .1

        

        elif key in 'cC':

                box2.change_color()



        box1.setPosition([x,y,z])

        

def onCollide(e):

        print "boxes collided!"

        e.obj1.color(random.choice( [viz.RED,viz.GREEN,viz.SKYBLUE,viz.YELLOW,viz.ORANGE,viz.PURPLE] ) )

        print e.obj1

        e.obj1.change_color()

                

viz.callback( viz.KEYBOARD_EVENT, onKeyboardEvent )

viz.callback( viz.COLLIDE_BEGIN_EVENT, onCollide )