text: from __future__ import print_function
  from __future__ import absolute_import
  from __future__ import division
  
  from compas.plugins import pluggable
  
  
  __all__ = ['trimesh_massmatrix']
  
  
  @pluggable(category='trimesh')
  def trimesh_massmatrix(M):
      """Compute massmatrix on a triangle mesh using a scalarfield of data points
      assigned to its vertices.
  
      Parameters
      ----------
      M : tuple[sequence[[float, float, float] | :class:`compas.geometry.Point`], sequence[[int, int, int]]]
          A mesh represented by a list of vertices and a list of faces.
  
      Returns
      -------
      list[float]
          The mass per vertex.
  
      Examples
      --------
      >>>
  
      """
      raise NotImplementedError
  