[Visualpython-users] assertion error

[symion <sy...@pr...>]

The following program generates a  Microsoft Visual C++ Assertion error 
message!
It has something to do with a box in a frame and changing opacity!

Symion

from __future__ import division
from visual import *
from random import uniform,random

# Derek Harrison, The Knoware Archive, December 2008

def wireframe(w,h,d):
    # For point, curve and convex Object position.
    x=w/2.0
    y=h/2.0
    z=d/2.0
    mat=[(-x,-y,-z),(x,-y,-z),(x,y,-z),(-x,y,-z),
         (-x,-y,-z),(-x,-y,z),(x,-y,z),(x,y,z),
         (-x,y,z),(-x,-y,z),(x,-y,z),(x,-y,-z),
         (x,y,-z),(x,y,z),(-x,y,z),(-x,y,-z)]
    return mat

def start():
    scene.visible=0
    scene.range=4.0
    scene.fov=1.103
    scene.ambient=0.5
    scene.userzoom=1
    scene.userspin=1
    scene.x=0
    scene.y=0
    scene.width=600
    scene.height=400
    scene.title='Project : Symion 2008'
    scene.forward=vector(0.622, 0.638, -0.455)

start()
#
old=False

f1=frame(pos=(0,0,0))
f2=frame(pos=(0,0,0))
f3=frame(pos=(0,0,0))
f4=frame(pos=(0,0,0))
#
if old:
    curve(frame=f1,pos=wireframe(1/4,4,4),color=color.orange)
    convex(frame=f1,pos=wireframe(1/4,4,4),color=color.red)
    curve(frame=f2,pos=wireframe(1/3,3,3),color=color.yellow)
    convex(frame=f2,pos=wireframe(1/3,3,3),color=color.orange)
    curve(frame=f3,pos=wireframe(1/2,2,2),color=color.white)
    convex(frame=f3,pos=wireframe(1/2,2,2),color=color.yellow)
    curve(frame=f4,pos=wireframe(1,1,1),color=color.blue)
    convex(frame=f4,pos=wireframe(1,1,1),color=color.white)   
else:
    box(frame=f1,size=(1/4,4,4),color=color.orange)
    box(frame=f2,size=(1/3,3,3),color=color.yellow)
    box(frame=f3,size=(1/2,2,2),color=color.white)
    box(frame=f4,size=(1,1,1),color=color.blue)

scene.visible=1

a=radians(1**2)
b=radians(2**2)
c=radians(3**2)
d=radians(4**2)
while 1:
    rate(10)
    f1.rotate(angle=a)
    f2.rotate(angle=b)
    f3.rotate(angle=c)
    f4.rotate(angle=d)
   
    if scene.mouse.events>0:
        m=scene.mouse.getevent()
        if m.release=='left':
            if m.pick:
                if m.pick.__class__ is box:
                    scene.center=m.pick.pos
                    m.pick.opacity=random()
                else:
                    scene.center=m.pickpos
                    m.pick.color=(random(),random(),random())
            else:
                scene.center=scene.mouse.pos
        else:
            pass
    else:
        pass