# Filled ParametricLine Surface 1¶

Using the function from the Parametric Set of Lines example, a line for values (1,4) is projected onto the x-y plane at z=0. Color of the surface is taken from the ‘shaded’ line.

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

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

def generalizedFunc(t, ny, nz) :
t = 2*np.pi*t
x, y, z = np.sin(t), np.cos(ny*t), np.sin(nz*t)
return x,y,z

# 2. Setup and map surfaces .........................................

line = s3d.ParametricLine(7,
lambda t : generalizedFunc(t,1,4), color='tan' )
surface = line.get_filled_surface()
surface.name = '(1,4)   z-projection @ 0'

# 3. Construct figure, add surfaces, and plot ......................
minmax=(-1.2,1.2)
fig = plt.figure(figsize=plt.figaspect(1))
ax = plt.axes(projection='3d')
ax.set(xlim=minmax, ylim=minmax, zlim=minmax, xlabel="X", ylabel="Y")
ax.set_title( surface.name, fontsize='large' )
ax.set_xticks([-1,0,1])
ax.set_yticks([-1,0,1])
ax.set_zticks([-1,0,1])
ax.view_init(30,40)