diff --git a/lib/mpl_toolkits/mplot3d/art3d.py b/lib/mpl_toolkits/mplot3d/art3d.py
index 62f73e4ea7fb..808ee5a95f7c 100644
--- a/lib/mpl_toolkits/mplot3d/art3d.py
+++ b/lib/mpl_toolkits/mplot3d/art3d.py
@@ -790,9 +790,9 @@ def zalpha(colors, zs):
# in all three dimensions. Otherwise, at certain orientations,
# the min and max zs are very close together.
# Should really normalize against the viewing depth.
- colors = get_colors(colors, len(zs))
- if len(zs):
- norm = Normalize(min(zs), max(zs))
- sats = 1 - norm(zs) * 0.7
- colors = [(c[0], c[1], c[2], c[3] * s) for c, s in zip(colors, sats)]
- return colors
+ if len(zs) == 0:
+ return np.zeros((0, 4))
+ norm = Normalize(min(zs), max(zs))
+ sats = 1 - norm(zs) * 0.7
+ rgba = np.broadcast_to(mcolors.to_rgba_array(colors), (len(zs), 4))
+ return np.column_stack([rgba[:, :3], rgba[:, 3] * sats])
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