new_contents: """Efficient mesh processing using numpy"""
  
  import numpy as np
  import json
  import maya.api.OpenMaya as OpenMaya
  import cmt.shortcuts as shortcuts
  
  
  class Mesh(object):
      @classmethod
      def from_obj(cls, file_path):
          with open(file_path, "r") as fh:
              lines = fh.readlines()
  
          points = []
          read_vertices = False
          for line in lines:
              if line.startswith("v "):
                  read_vertices = True
                  v = line.split()[1:]
                  points.append([float(v[0]), float(v[1]), float(v[2])])
              elif read_vertices:
                  break
          points = np.array(points)
          return Mesh(points)
  
      @classmethod
      def from_maya_mesh(cls, mesh):
  
          points = shortcuts.get_points(mesh)
          points = np.array([[p.x, p.y, p.z] for p in points])
          return Mesh(points)
  
      def __init__(self, points):
          self.points = points
  
      def mask_points(self, base, mask):
          points = base.points + ((self.points - base.points).T * mask.values).T
          return Mesh(points)
  
      def to_maya_mesh(self, mesh):
  
          points = OpenMaya.MPointArray()
          for p in self.points:
              points.append(OpenMaya.MPoint(p[0], p[1], p[2]))
          shortcuts.set_points(mesh, points)
  
  
  class Mask(object):
      """1D array of float values."""
  
      @classmethod
      def from_file(cls, file_path):
          with open(file_path, "r") as fh:
              data = json.load(fh)
          values = np.array(data)
          return Mask(values)
  
      def __init__(self, values):
          self.values = values
  
subject: Add efficient mesh processing class using numpy