Sliced Sphere

Here's a little example that draws an animated sliced sphere, using fake shadow and
sin()
andcos()
to give the illusion of 3D.def ellipse(center, wr, hr): cx, cy = center oval(cx  wr, cy  hr, wr * 2, hr * 2) canvasSize = 800 radius = 0.9 * canvasSize / 2 numEllipses = 12 numFrames = 40 sphereAngle = radians(20) # make radians from degrees ellipseHeight = sin(sphereAngle) heightCompensation = cos(sphereAngle) for frame in range(numFrames): t = (0.25 + frame / numFrames) % 1.0 newPage(canvasSize, canvasSize) frameDuration(1/20) rect(0, 0, canvasSize, canvasSize) translate(canvasSize/2, canvasSize/2) fill(1) shadow((0, canvasSize * 0.03), canvasSize * 0.03, (0, 0, 0, 0.6)) for i in range(numEllipses): f = (i + (1  t)) / (numEllipses) circleY = 2 * (f  0.5) wr = radius * cos(asin(circleY)) y = heightCompensation * radius * circleY ellipse((0, y), wr, ellipseHeight * wr) saveImage("SlicedSphere.gif")
Somehow I failed to embed an animated gif in the post. Here's the animation: http://dailydrawbot.tumblr.com/post/170450438649/slicedsphere