code: def is_winding_consistent(self):
          
          if self.is_empty:
              return False
          # consistent winding check is populated into the cache by is_watertight
          populate = self.is_watertight
          return self._cache['is_winding_consistent']
docs: Does the mesh have consistent winding or not.
          A mesh with consistent winding has each shared edge
          going in an opposite direction from the other in the pair.
  
          Returns
          --------
          consistent : bool
            Is winding is consistent or not