Mayavi Mlab：绘制八面体

Question

I cannot find a way to draw octahedrons. Could someone point me to a class for drawing triangular (transclucent) surfaces at the least?

tvtk.tools.visual seems to have only a few basic shapes.

Answer 1

The Gallery has an example of how to use triangular_mesh :

import numpy as np
import mayavi.mlab as ML

verts = [(1,-1,0), (1,1,0), (-1,1,0), (-1,-1,0), (0,0,1), (0,0,-1)]
x, y, z = zip(*verts)
# Each triangle is a 3-tuple of indices. The indices are indices of `verts`.
triangles = [(i, (i+1)%4, j) for i in range(4) for j in (4,5)]
colorval = z
ML.triangular_mesh(x, y, z, triangles, scalars=colorval, opacity=0.75)
ML.show()