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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"mplot3d: set_offsets()/set_array() don't work right for 3d collections","articleBody":"It's easy to make animated/interactive 2d plots with PatchCollections, where one can dynamically alter the positions, colors (if using a ScalarMappable colormap), and number of active patches using the `set_offsets()` and `set_array()` commands.\n\nThis doesn't work quite right for, e.g., Patch3DCollection objects. One can work around `set_offsets()` by setting the `_offsets3d` attribute directly, and that seems to work fine, but perhaps this could be bundled up into a `set_offsets()` method?\n\nIt's trickier for changing the colormap values with `set_array()`, because there's no clear hook for how to invoke the zalpha() function appropriately. Worse, at times I'm able to re-create the \"patches lose their color and turn gray\" bug when directly setting these values -- but I can't exactly figure out where or when. I'm working on a test case for this...\n\nI can try to work up a patch for this, but if @WeatherGod or anyone else could give a hint or two as to the best approach, that would be helpful! I'm thinking that `set_3d_properties()` and `do_3d_projection()` have basically the logic required, which could be refactored into `set_offsets()` and `set_array()` calls that would do the right things...\n\nPS. Last issue for today, I promise -- sorry for the spam!\n","author":{"url":"https://github.com/zpincus","@type":"Person","name":"zpincus"},"datePublished":"2012-03-21T20:02:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/784/matplotlib/issues/784"}