# Vertical Contour Filled SurfaceΒΆ

Using the contours from the Vertical Contour Set example, filled line surfaces were created and displayed in the plot (highlighted lines).

```import numpy as np
import matplotlib.pyplot as plt
import s3dlib.surface as s3d
from matplotlib import cm

# 1. Define function to examine .....................................

def geo_map(xyz) :
x,y,z = xyz
X,Y = 3*x, 3*y
Z1 = np.exp(-X**2 - Y**2)
Z2 = np.exp(-(X - 1)**2 - (Y - 1)**2)
Z = Z1-Z2
return x,y,Z

# 2. Setup and map surfaces .........................................
rez = 5
pc = cm.get_cmap('viridis')(0.5)

plane = s3d.PlanarSurface(color=pc).set_surface_alpha(.3)

surface = s3d.PlanarSurface(rez)
surface.map_geom_from_op( geo_map )

line = surface.contourLineSet(21)
line.map_cmap_from_op(lambda xyz: xyz[2])
line.set_linewidth(2)

surface = line.get_filled_surface()
surface.set_surface_alpha(.4)

# 3. Construct figure, add surface, plot ............................

fig = plt.figure(figsize=plt.figaspect(0.75))
fig.text(0.975,0.975,str(line)+'\n'+str(surface),
ha='right', va='top', fontsize='smaller', multialignment='right')
ax = plt.axes(projection='3d')
minmax = ( -0.8,0.8 )
ax.set(xlim=minmax, ylim=minmax, zlim=minmax )
plt.colorbar(line.stcBar_ScalarMappable(21,'w'), ax=ax,  shrink=0.6 )
ax.set_axis_off()
ax.view_init(20,-55)