I found that

def set_sort_zpos(self,val):

'''Set the position to use for z-sorting.'''

self._sort_zpos = val

was missing from

class Line3DCollection(LineCollection) (in matplotlib 1.0.1):

Now, with the above method added, add_collection3d works as it should with line segments, and the following will work as expected

'''

Purpose: Waterfall plot using LineCollection

Author: V.P.S. (2011-03-26)

'''

from mpl_toolkits.mplot3d import Axes3D

from matplotlib.collections import LineCollection

from matplotlib.colors import colorConverter

import matplotlib.pyplot as plt

import numpy as np

np.random.seed(40040157) # Used to allow repeatable experiments (plots)

fig = plt.figure()

ax = fig.gca(projection='3d')

cc = [colorConverter.to_rgba(c,alpha=0.6) for c in ('r','g','b','c','y','m','k')]

ncc = len(cc)

nxs = 5 # Num of points to connect (nxs-1 line segments)

# Generate X values

xs = np.arange(1, nxs+1, 1)

# Create array of Y values (to be updated)

ys = np.zeros(nxs)

# Create list of Z values

nzs = 4 # Num of Z-planes

zs = [zs+1 for zs in range(nzs)]

# Create list of colors (cyclic) for lines

colorlist = [cc[j%ncc] for j in range(nzs)]

segs = []

# Generate line segments in each Z-plane

for j in zs:

ys = np.random.rand(nxs)

segs.append(zip(xs, ys))

curves = LineCollection(segs, colors = colorlist)

ax.add_collection3d(curves, zs=zs, zdir='y')

ax.set_xlabel('X') # points to right -- X

ax.set_xlim3d(0, nxs+1)

ax.set_ylabel('Y') # points into screen -- Y

ax.set_ylim3d(0, nzs+1)

ax.set_zlabel('Z') # points up -- Z

ax.set_zlim3d(0, 1)

plt.show()

Have a Good Day

--V