1 from visual import *
   2 
   3 ball = sphere(pos=(-5,0,0),radius=0.5,color=color.red)
   4 ball.trail = curve(color=ball.color)
   5 wallR = box(pos=(6,0,0),size=(0.2,12,12),color=color.green)
   6 wallL = box(pos=(-6,0,0),size=(0.2,12,12),color=color.green)
   7 wallT = box(pos=(0,6,0),size=(12,0.2,12),color=color.orange)
   8 wallB = box(pos=(0,-6,0),size=(12,0.2,12),color=color.orange)
   9 wallBa = box(pos=(0,0,-6),size=(12,12,0.2),color=color.cyan)
  10 dt = 0.05
  11 ball.velocity = vector(2,5,-1)
  12 while True:
  13         rate(100)
  14         ball.pos = ball.pos+ball.velocity*dt
  15         if ball.x>wallR.x:
  16                 ball.velocity.x *= -1
  17         if ball.x<wallL.x:
  18                 ball.velocity.x *= -1
  19         if ball.y>wallT.y:
  20                 ball.velocity.y *=-1
  21         if ball.y<wallB.y:
  22                 ball.velocity.y *=-1
  23         if ball.z<wallBa.z:
  24                 ball.velocity.z *= -1
  25         if ball.z>6:
  26                 ball.velocity.z *= -1
  27         ball.trail.append(pos=ball.pos)