fixed transparency bug #10237

DanielMatu · jklymak · commit 27f406590d61 · 2019-03-02T19:31:57.000-08:00
in Poly3DCollection's set_alpha method, facecolor was getting updated when facecolors3d should have been updated instead.
diff --git a/lib/mpl_toolkits/mplot3d/art3d.py b/lib/mpl_toolkits/mplot3d/art3d.py
@@ -758,7 +758,7 @@ def set_alpha(self, alpha):
                 raise TypeError('alpha must be a float or None')
         artist.Artist.set_alpha(self, alpha)
         try:
-            self._facecolors = mcolors.to_rgba_array(
+            self._facecolors3d = mcolors.to_rgba_array(
                 self._facecolors3d, self._alpha)
         except (AttributeError, TypeError, IndexError):
             pass
