code: def _absint(self, i, ref):
      i = int(i)
      if i > 0:
          return i - 1
      else:
          return ref + i
  
imports: import numpy
  import time
  from gzip import GzipFile
  from os import path
  from ..geometry import _calculate_normals
  from ..util import logger
label_desc: Use image node_id 6 for calling the WavefrontReader obj's underlying member method code with example usage: obj._absint(i, ref) and returns: unknown, unknown