code: def create_square_triangle_mesh():
      r"""Creates a square mesh, in the z=0 planse and facing +z.
  
        # (0,1) 2---3 (1,1)
        #       |\ /|
        #       | 4 |
        #       |/ \|
        # (0,0) 0---1 (1,0)
  
      Returns:
        vertices: A [5, 3] float array
        faces: A [4, 3] int array
      """
      vertices = np.array(
          ((0, 0, 0), (1, 0, 0), (0, 1, 0), (1, 1, 0), (0.5, 0.5, 0)),
          dtype=np.float32,
      )
      faces = np.array(
          ((0, 1, 4), (1, 3, 4), (3, 2, 4), (2, 0, 4)), dtype=np.int32
      )
      return vertices, faces
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: create_square_triangle_mesh() and returns: vertices,  faces