code: def proj_matrix(self):
      return perspective(self.fovy, self.aspect, self.znear, self.zfar)
  
imports: from contextlib import contextmanager
  import numpy
  import OpenGL.GL
  from .meshutil import perspective
label_desc: Use image node_id 3 for calling the MeshRenderer obj's underlying member method code with example usage: obj.proj_matrix() and returns: perspective