René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Path3DCollection.set_color(self, c) does not change the color of scatter points.","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nI created a Path3DCollection from Axes.scatter(self). The Path3DCollection.set_color(self) method does not change the color of scatter points.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\nfrom matplotlib import animation\r\n\r\nnp.random.seed(1000)\r\nBLUE = \"#1f77b4\"\r\nYELLOW = \"#bcbd22\"\r\n\r\npoints = np.random.random_sample((1000, 3))\r\ncolors = lambda: list(YELLOW if np.random.random() \u003e 0.5 else BLUE for _ in points)\r\n\r\nfig = plt.figure()\r\nax = plt.axes(projection='3d')\r\npaths = ax.scatter(points[:,0], points[:,1], points[:,2])\r\ndef step(i):\r\n    paths.set_color(colors())\r\n    # paths.set_3d_properties(points[:,2], 'z')   # Try uncommenting this line\r\n    return paths\r\nanim = animation.FuncAnimation(fig, step, frames=200, interval=20)\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n\r\nColors are static and do not change from initial.\r\n![no_change](https://user-images.githubusercontent.com/5098329/91865747-8f946180-ec26-11ea-9ac5-98c1e96263e7.png)\r\n\r\nIf you run set_3d_properties(), then the colors do change, but I don't know how to use this function to leave the coordinates alone.\r\n![yes_change](https://user-images.githubusercontent.com/5098329/91865583-6247b380-ec26-11ea-91ac-4ffe7505152d.gif)\r\n\r\n**Expected outcome**\r\nThe magic of Christmas.\r\n\r\nThe points should not change in position like in the first image, but should change in color like in the second image.\r\n\r\n**Matplotlib version**\r\n  * Operating system: macOS Catalina 10.15.6\r\n  * Matplotlib version: 3.3.1\r\n  * Matplotlib backend: MacOSX\r\n  * Python version: 3.8.5 (default, Jul 21 2020, 10:48:26) [Clang 11.0.3 (clang-1103.0.32.62)]\r\n\r\nMatplotlib installed from pip\r\n\r\n","author":{"url":"https://github.com/QuocAnhVu","@type":"Person","name":"QuocAnhVu"},"datePublished":"2020-09-01T14:48:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/18386/matplotlib/issues/18386"}