code: def preprocess(self, vertices, w, h):
      R1 = face3d.mesh.transform.angle2matrix([0, 180, 180])
      t = np.array([-w // 2, -h // 2, 0])
      vertices = vertices.T
      vertices += t
      vertices = self.transform(vertices.T, R1).T
      return vertices
  
imports: import os, sys, datetime
  import numpy
  import os.path
  import albumentations
  from albumentations.core.transforms_interface import ImageOnlyTransform
  from .face_analysis import FaceAnalysis
  from ..utils import get_model_dir
  from ..thirdparty import face3d
  from ..data import get_image
  from ..utils import DEFAULT_MP_NAME
  import cv2
label_desc: Use image node_id 4 for calling the MaskRenderer obj's underlying member method code with example usage: obj.preprocess(vertices, w, h) and returns: vertices