There is a function ax.contour3D() that can be used to create a 3-D function. It takes input data in the form of two-dimensional regular grids, with its Z-data evaluated at each point.

## Example

```
from mpl_toolkits import mplot3d
import numpy as np
import matplotlib.pyplot as plt
a= np.linspace(-0.1,10,100)
b=np.linspace(-0.1,10,100)
a,b= np.meshgrid(a,b)
c=(a**2)/4+(b**2)/9
fig = plt.figure()
ax = fig.add_subplot(121, projection='3d')
ax.contour(a,b,c, 100)
ax.set_title('3D contour')
plt.show()
```

Here is the explanation of the some function used in the above example are:

**meshgrid:**This is the function of numpy which is basically used to create a rectangular grid out of two given one-dimension arrays representing Matrix Indexing.**plt.axes():**It is used to create the axis of the object.**ax.contour3D:**It is used to create contour.**ax.set_xlabel:**It is used to label the X-axis.**ax.set_title:**It is used to give a title to the plot.

**Output:**