class_docstr: Class to handle camera geometry.
class_docstr_tok: ["Class","to","handle","camera","geometry","."]
code: def optical_axis(self):
      return self.orientation[2, :]
  
imports: import copy
  import json
  from typing import Tuple, Union, Optional
  import numpy
  from nerfies import gpath
  from nerfies import types
label_desc: Use image node_id 14 for calling the Camera obj's underlying member method code with example usage: obj.optical_axis() and returns: self