Fix missing Patch3DCollection._z_markers_idx

slavoutich · slavoutich · commit 357db6dd57a4 · 2021-06-11T20:40:40.000+02:00
The issue is introduced by commit f888285: attribute `Patch3DCollection._z_markers_idx` is used within `_maybe_depth_shade_and_sort_colors()` function, but is never assigned. The same changes were done in the `Path3DCollection` class, but there attribute is set correctly within `set_3d_properties()` function. Assuming this is the expected behaviour, this commit also sets `_z_markers_idx` in `Patch3DCollection.set_3d_properties()`
diff --git a/lib/mpl_toolkits/mplot3d/art3d.py b/lib/mpl_toolkits/mplot3d/art3d.py
@@ -462,6 +462,7 @@ def set_3d_properties(self, zs, zdir):
             xs = []
             ys = []
         self._offsets3d = juggle_axes(xs, ys, np.atleast_1d(zs), zdir)
+        self._z_markers_idx = slice(-1)
         self._vzs = None
         self.stale = True
 
