code: def create_single_triangle_mesh():
      r"""Creates a single-triangle mesh, in the z=0 plane and facing +z.
  
    (0,1) 2
          |\
          | \
          |  \
    (0,0) 0---1 (1,0)
  
    Returns:
      vertices: A [3, 3] float array
      faces: A [1, 3] int array
    """
      vertices = np.array(
          ((0, 0, 0), (1, 0, 0), (0, 1, 0)), dtype=np.float32
      )
      faces = np.array(((0, 1, 2),), 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 1 for calling a global function with example usage: create_single_triangle_mesh() and returns: vertices,  faces