How to fill selected cells in 3D Matplotlib?-CodePudding

This should a straight forward question but I could not find the answer, sorry if the question is a duplicate one. Basically I want to fill Ncell cells on a 3D grid of Ngrid x Ngrid x Ngrid. Below I present a MWE where I just scatter plot the centre (or one corner, it does not matter, I can readjust) of each cell.

import numpy as np
from mpl_toolkits.mplot3d.art3d import Poly3DCollection
import matplotlib.pyplot as plt

Ngrid,Ncell=100,150

xx=np.random.choice(Ngrid,Ncell)
yy=np.random.choice(Ngrid,Ncell)
zz=np.random.choice(Ngrid,Ncell)

%matplotlib widget

fig = plt.figure(figsize = (10, 7))
ax = plt.axes(projection ="3d")
ax.scatter3D(xx,yy,zz,marker='o',alpha=0.5)

Instead of the scatter plot, I need each cell to be filled with a color. Note that my grid and Ncell are much larger than the above values (grid = 1000^3 and Ncell= order 10^5), so an efficient code will be very important. Thank you in advacne.

CodePudding user response：

You can try with