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#!/usr/bin/env python
import numpy as np
import gudhi
# Coordinates of the points
points=np.array([[0,0,0],[1,0,0],[0,1,0],[0,0,1],[1,1,1],[1,1,0],[0,1,1]])
# Build the simplicial complex with a tetrahedon, an edge and an isolated vertex
cplx=gudhi.SimplexTree()
cplx.insert([1,2,3,5])
cplx.insert([4,6])
cplx.insert([0])
triangles = np.array([s[0] for s in cplx.get_skeleton(2) if len(s[0])==3])
## With matplotlib
from mpl_toolkits.mplot3d import Axes3D
from mpl_toolkits.mplot3d.art3d import Line3DCollection
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.gca(projection='3d')
# Plot triangles
ax.plot_trisurf(points[:,0], points[:,1], points[:,2], triangles=triangles)
# Plot points
ax.scatter3D(points[:,0], points[:,1], points[:,2])
# Plot edges
edges=[]
for s in cplx.get_skeleton(1):
e = s[0]
if len(e) == 2:
edges.append(points[[e[0],e[1]]])
ax.add_collection3d(Line3DCollection(segments=edges))
plt.show()
## With mayavi
from mayavi import mlab
# Plot triangles
mlab.triangular_mesh(points[:,0], points[:,1], points[:,2], triangles);
# Plot points
mlab.points3d(points[:,0], points[:,1], points[:,2])
# Plot edges
for s in cplx.get_skeleton(1):
e = s[0]
if len(e) == 2:
pts = points[[e[0],e[1]]]
mlab.plot3d(pts[:,0],pts[:,1],pts[:,2],tube_radius=None)
mlab.show()
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