René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Overlapping 3D objects","articleBody":"### Bug report\r\nWhen plotting a 3D plane, a segment and a few points, there are visualization issues:\r\nThe 'filling' of the plane cover the line and the points\r\n\r\n```\r\nimport mpl_toolkits.mplot3d as a3\r\nimport matplotlib.pylab as plt\r\nimport numpy as np    \r\n\r\nfig = plt.figure()\r\nax = a3.Axes3D(fig)\r\n\r\n# create an orizontal plane\r\ncorners = [[0,0,0],[0,5,0],[5,5,0],[5,0,0]]\r\ntri = a3.art3d.Poly3DCollection([corners], alpha=1)\r\ntri.set_color('w')\r\ntri.set_edgecolor('k')\r\nax.add_collection3d(tri)\r\n\r\n# plot a vector\r\nax.plot([2,2],[2,2],[0,4], c = 'r')\r\n\r\n# plot some points\r\nax.scatter([1,3],[1,3],[1,3], c = 'r')\r\n\r\nax.set_xlim([0, 5.0])\r\nax.set_ylim([0, 5.0])\r\nax.set_zlim([0, 2.5]);\r\n\r\nplt.show()\r\n```\r\noutput figure\r\n![image](https://user-images.githubusercontent.com/15570009/47452193-ed092d00-d7c9-11e8-9ad4-87bf80dbfb7f.png)\r\n\r\nexpected output:\r\nthe red segment should at [2, 2, 0] in the middle of the plane. It looks as it is 'under' it\r\n\r\n[stackoverflow thread](https://stackoverflow.com/questions/52923540/matplotlib-3d-workaround-for-plot-order)\r\n\r\n**Matplotlib version**\r\n\r\n  * Operating system:\r\n  * Matplotlib version: 3.0.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5, GTK and WX\r\n  * Python version: 3.6.6\r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\nInstalled with pip\r\n\r\n\r\n","author":{"url":"https://github.com/Chutlhu","@type":"Person","name":"Chutlhu"},"datePublished":"2018-10-24T18:17:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/12620/matplotlib/issues/12620"}