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2020/sketch_2020_01_25a/sketch_2020_01_25a.pyde

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+from __future__ import division
+add_library('VideoExport')
+
+def setup():
+    size(720, 720, P2D)
+    global videoExport
+    videoExport = VideoExport(this)
+    videoExport.startMovie()
+    videoExport.setFrameRate(15)
+    # frameRate(30)
+    colorMode(HSB)
+    noFill()
+    # strokeWeight(5)
+    noiseSeed(20200122)
+
+def draw():
+    background(240)
+    translate(width / 2, height / 2)
+    num_points = 360
+    n_scale = .005
+    a = TWO_PI / num_points
+    x_off = y_off = z_off = width
+    for radius in range(360, 6, -6):
+        f = radians(frameCount - radius / 2)
+        beginShape()
+        for i in range(num_points):
+            ny = 100 * sin(f - a * i) + x_off
+            nx = 100 * cos(f + a * i) + y_off
+            nz = 100 * sin(f)
+            r = 2*radius * noise(nx * n_scale,
+                                   ny * n_scale,
+                                   nz * n_scale)
+            y = r * sin(a * i)
+            x = r * cos(a * i)
+            stroke(map(r, 6, radius*1.5, 0, 255),
+                 200, 200)
+            vertex(x, y)
+        endShape(CLOSE)
+
+    videoExport.saveFrame()
+    if frameCount == 360:
+        videoExport.endMovie()
+        exit()