code: def set_data(self, vertices=None, tris=None, data=None):
          
          # modifier pour tenier compte des None self._recompute = True
          if data is not None:
              self._data = data
              self._need_recompute = True
          if vertices is not None:
              self._vertices = vertices
              self._need_recompute = True
          if tris is not None:
              self._tris = tris
              self._need_recompute = True
          self.update()
docs: Set the data
  
          Parameters
          ----------
          vertices : ndarray, shape (Nv, 3) | None
              Vertex coordinates.
          tris : ndarray, shape (Nf, 3) | None
              Indices into the vertex array.
          data : ndarray, shape (Nv,) | None
              scalar at vertices