get 2D slice at Z from 3D meshgrid

Question

I have 4 columns and plot a 3D map with a color map using the 4th column values. Here is my script.

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

input = np.loadtxt("data.txt",delimiter=',')
x = input[:,0]
y = input[:,1]
Z = input[:,2]
V = input[:,3]
# create the figure, add a 3d axis, set the viewing angle
fig = plt.figure(figsize=(12, 9), dpi=80)
ax = fig.add_subplot(111, projection='3d')
ax.view_init(20,20)
my_cmap = plt.get_cmap('hot')
ax.plot_trisurf(x,y,, cmap = my_cmap, linewidth=0, antialiased=False)

Is it possible to convert it into a 3D meshgrid and extract 2D slices from each value of Z?

Ouput: