Bounce-VPython.ipynb

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       "<div id=\"glowscript\" class=\"glowscript\"></div>"
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   "source": [
    "from vpython import *\n",
    "scene = canvas() # This is needed in Jupyter notebook and lab to make programs easily rerunnable\n",
    "scene.caption = \"\"\"Right button drag or Ctrl-drag to rotate \"camera\" to view scene.\n",
    "To zoom, drag with middle button or Alt/Option depressed, or use scroll wheel.\n",
    "     On a two-button mouse, middle is left + right.\n",
    "Touch screen: pinch/extend to zoom, swipe or two-finger rotate.\"\"\"\n",
    "\n",
    "side = 4.0\n",
    "thk = 0.3\n",
    "s2 = 2*side - thk\n",
    "s3 = 2*side + thk\n",
    "wallR = box (pos=vector( side, 0, 0), size=vector(thk, s2, s3),  color = color.red)\n",
    "wallL = box (pos=vector(-side, 0, 0), size=vector(thk, s2, s3),  color = color.red)\n",
    "wallB = box (pos=vector(0, -side, 0), size=vector(s3, thk, s3),  color = color.blue)\n",
    "wallT = box (pos=vector(0,  side, 0), size=vector(s3, thk, s3),  color = color.blue)\n",
    "wallBK = box(pos=vector(0, 0, -side), size=vector(s2, s2, thk), color = color.gray(0.7))\n",
    "\n",
    "ball = sphere (color = color.green, radius = 0.4, make_trail=True, retain=100)\n",
    "ball.mass = 1.0\n",
    "ball.p = vector(-0.15, -0.23, +0.27)\n",
    "side = side - thk*0.5 - ball.radius\n",
    "\n",
    "dt = 0.3\n",
    "t = 0.0\n",
    "while True:\n",
    "    rate(200)\n",
    "    t = t + dt\n",
    "    ball.pos = ball.pos + (ball.p/ball.mass)*dt\n",
    "    if not (side > ball.pos.x > -side):\n",
    "        ball.p.x = -ball.p.x\n",
    "    if not (side > ball.pos.y > -side):\n",
    "        ball.p.y = -ball.p.y\n",
    "    if not (side > ball.pos.z > -side):\n",
    "        ball.p.z = -ball.p.z\n"
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