add polyhedral example

[akaszynski]

Polyhedral Example

In response to #2503, this PR adds a basic polyhedral example to our docs:

points = np.array(
    [[0.0480, 0.0349, 0.9982],
     [0.0305, 0.0411, 0.9987],
     [0.0207, 0.0329, 0.9992],
     [0.0218, 0.0158, 0.9996],
     [0.0377, 0.0095, 0.9992],
     [0.0485, 0.0163, 0.9987],
     [0.0572, 0.0603, 0.9965],
     [0.0390, 0.0666, 0.9970],
     [0.0289, 0.0576, 0.9979],
     [0.0582, 0.0423, 0.9974],
     [0.0661, 0.0859, 0.9941],
     [0.0476, 0.0922, 0.9946],
     [0.0372, 0.0827, 0.9959],
     [0.0674, 0.0683, 0.9954]],
)


face_a = [6, 0, 1, 2, 3, 4, 5]
face_b = [6, 6, 7, 8, 1, 0, 9]
face_c = [6, 10, 11, 12, 7, 6, 13]
faces = np.hstack((face_a, face_b, face_c))

mesh = pv.PolyData(points, faces)
mesh.plot(show_edges=True, line_width=5)

[codecov]

Codecov Report

Merging #2505 (5e77cc6) into main (6bb517c) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2505      +/-   ##
==========================================
+ Coverage   93.70%   93.75%   +0.04%     
==========================================
  Files          75       75              
  Lines       16072    16072              
==========================================
+ Hits        15061    15069       +8     
+ Misses       1011     1003       -8     

[adeak]

Haven't built the docs yet but LGTM, thanks. One very weak suggestion that you can also just ignore.