Matplotlib中心轴上的plot_surface轴区域

Question

I am trying to create a 3d surface plot but the result is not aligned to the origin:

You can easily see on the Z-projection that it's a little off on the X and Y axes. My data is a matrix where the first two columns are my X's and Y's and the 3rd column is my Z. This is how I compute the values:

bins = np.linspace(0, 1, 1000)
indices = np.digitize(data[:, :2], bins, right=True)
X, Y = np.meshgrid(bins, bins, indexing='ij')
Q = np.zeros_like(X)
C = np.zeros_like(X)
d = data[:, 2]
for idx in range(0, len(indices)):
    (i,j) = indices[idx]
    Q[i, j] += d[idx]
    C[i, j] += 1
C[C == 0] = 1 # avoid division by zero errors
Q /= C
return (X, Y, Q, C)

Plotting code:

fig = plt.figure(figsize=(30, 15))
ax = fig.add_subplot(121, projection='3d')
ax.set_xlim3d(-0.5, 1)
ax.set_ylim3d(0, 1.5)
ax.set_zlim3d(-1.5, 1)
Q = ndi.gaussian_filter(Q, sigma=10)
ax.plot_surface(X, Y, Q, cmap=cm.coolwarm, lw=lw, rstride=rs, cstride=cs, alpha=a, antialiased=True)
ax.contourf(X, Y, Q, zdir='z', offset=-1.5, cmap=cm.coolwarm)
ax.contourf(X, Y, Q, zdir='x', offset=-0.5, cmap=cm.coolwarm)
ax.contourf(X, Y, Q, zdir='y', offset=+1.5, cmap=cm.coolwarm)

My question is, am I missing any calculation to ensure the surface is aligned to the origin? thanks.

Answer 1

The surface is aligned to the origin. But the origin is "hanging in the air". Or in other words, the bottom pane is slightly (~0.05 units) below the contourf plot, which makes it appear as if the plot was misaligned.

You may want to look at this question: Removing axes margins in 3D plot use one of the two answers to have the panes aligned properly.