Question

I tried the following:

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D

carr = np.array([[0,0,0,1],[0,0,1,1],[0,1,0,1]]) # RGBA color array
ax = plt.axes(projection='3d')
h = ax.scatter([1,2,3],[1,2,3],[1,2,3], c=carr)
h.set_edgecolor(carr) ## also tried h.set_edgecolor('none')
plt.draw()

But the marker edgecolors remain black.

Answer 1

Try specifying the colors as the edgecolors kwarg to scatter. (Note the plural.)

E.g.

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D

carr = np.array([[0,0,0,1],[0,0,1,1],[0,1,0,1]]) # RGBA color array
ax = plt.axes(projection='3d')
h = ax.scatter([1,2,3],[1,2,3],[1,2,3], c=carr, edgecolors=carr)
plt.show()