system_assignation/imports/geometry_feeders/obj.py

"""
Obj module parses obj files and import the geometry into the city model structure
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
"""
import trimesh.exchange.obj
from city_model_structure.city import City
from city_model_structure.building import Building
from city_model_structure.attributes.surface import Surface
from helpers.geometry_helper import GeometryHelper
from city_model_structure.attributes.polygon import Polygon


class Obj:
  """
  Obj class
  """
  def __init__(self, path):
    self._city = None
    with open(path, 'r') as file:
      self._scene = trimesh.exchange.obj.load_obj(file)
  # todo: review class trimesh.exchange.load that returns Trimesh or Trimesh.scene

  @property
  def scene(self) -> dict:
    return self._scene

  @property
  def city(self) -> dict:
    if self._city is None:
      # todo: refactor this method to clearly choose the gml type
      self._city = City(self._lower_corner, self._upper_corner, self._srs_name)

    return self._city