in gym3/viewer.py [0:0]
def _get_image(self) -> None:
_, ob, _ = self.observe()
if self._info_key is None:
if self._ob_key is not None:
ob = ob[self._ob_key]
return ob[self._env_index]
else:
info = self.get_info()
return info[self._env_index][self._info_key]