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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"get_datalim returns non-finite values for finite Line3DCollection","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\nDiscovered whilst investigating https://github.com/matplotlib/matplotlib/issues/17130, the `get_datalim` method of `Line3DCollection` is returning `inf` values for a finite 3D line collection.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nfrom matplotlib.collections import LineCollection\r\nfrom mpl_toolkits.mplot3d import Axes3D\r\nfrom mpl_toolkits.mplot3d.art3d import Line3DCollection\r\n\r\n\r\nsegments = [[(0, 0), (1, 1)]]\r\ncollection = LineCollection(segments)\r\nfig, ax = plt.subplots()\r\nax.add_collection(collection)\r\nprint('2D:', collection.get_datalim(ax.transAxes))\r\n\r\nsegments = [[(0, 0, 0), (1, 1, 1)]]\r\ncollection = Line3DCollection(segments)\r\n\r\nfig = plt.figure()\r\nax = fig.gca(projection='3d')\r\nax.add_collection3d(collection)\r\n\r\nprint('3D:', collection.get_datalim(ax.transAxes))\r\n\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\n2D: Bbox(x0=0.0, y0=0.0, x1=1.0, y1=1.0000000000000002)\r\n3D: Bbox(x0=inf, y0=inf, x1=-inf, y1=-inf)\r\n```\r\n\r\n**Expected outcome**\r\nThe 3D case to have finite and [0, 1] bounds for x and y. Possibly it should also return the z bounds too.\r\n\r\n","author":{"url":"https://github.com/dstansby","@type":"Person","name":"dstansby"},"datePublished":"2020-08-07T09:47:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/18197/matplotlib/issues/18197"}