city_retrofit/exports/building_energy/idf.py

"""
Idf exports one building to idf format
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2022 Concordia CERC group
Project Coder Guille Guillermo.GutierrezMorote@concordia.ca
Code contributors: Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
                   Soroush Samareh Abolhassani soroush.samarehabolhassani@mail.concordia.ca
"""
import copy
from pathlib import Path
from geomeppy import IDF
import helpers.constants as cte
from city_model_structure.attributes.schedule import Schedule


class Idf:
  """
  Exports city to IDF
  """
  _BUILDING = 'BUILDING'
  _ZONE = 'ZONE'
  _LIGHTS = 'LIGHTS'
  _PEOPLE = 'PEOPLE'
  _THERMOSTAT = 'HVACTEMPLATE:THERMOSTAT'
  _IDEAL_LOAD_AIR_SYSTEM = 'HVACTEMPLATE:ZONE:IDEALLOADSAIRSYSTEM'
  _SURFACE = 'BUILDINGSURFACE:DETAILED'
  _SHADING = 'SHADING:BUILDING:DETAILED'
  _SHADING_PROPERTY = 'SHADINGPROPERTY:REFLECTANCE'
  _BUILDING_SURFACE = 'BuildingSurfaceDetailed'
  _CONSTRUCTION = 'CONSTRUCTION'
  _MATERIAL = 'MATERIAL'
  _MATERIAL_NOMASS = 'MATERIAL:NOMASS'
  _MATERIAL_ROOFVEGETATION = 'MATERIAL:ROOFVEGETATION'

  _WINDOW = 'WINDOW'
  _WINDOW_MATERIAL_SIMPLE = 'WINDOWMATERIAL:SIMPLEGLAZINGSYSTEM'
  _ROUGHNESS = 'MediumRough'
  _INFILTRATION = 'ZONEINFILTRATION:DESIGNFLOWRATE'

  _HOURLY_SCHEDULE = 'SCHEDULE:DAY:HOURLY'
  _COMPACT_SCHEDULE = 'SCHEDULE:COMPACT'
  _FILE_SCHEDULE = 'SCHEDULE:FILE'
  _SCHEDULE_LIMIT = 'SCHEDULETYPELIMITS'
  _ON_OFF = 'On/Off'
  _FRACTION = 'Fraction'
  _ANY_NUMBER = 'Any Number'
  _CONTINUOUS = 'Continuous'
  _DISCRETE = 'Discrete'
  _SIZING_PERIODS = 'SIZINGPERIOD:DESIGNDAY'
  _LOCATION = 'SITE:LOCATION'
  _SIMPLE = 'Simple'

  idf_surfaces = {
    # todo: make an enum for all the surface types
    cte.WALL: 'wall',
    cte.GROUND: 'floor',
    cte.ROOF: 'roof'
  }
  idf_type_limits = {
    cte.ON_OFF: 'on/off',
    cte.FRACTION: 'Fraction',
    cte.ANY_NUMBER: 'Any Number',
    cte.CONTINUOUS: 'Continuous',
    cte.DISCRETE: 'Discrete'
  }
  idf_day_types = {
    cte.MONDAY: 'Monday',
    cte.TUESDAY: 'Tuesday',
    cte.WEDNESDAY: 'Wednesday',
    cte.THURSDAY: 'Thursday',
    cte.FRIDAY: 'Friday',
    cte.SATURDAY: 'Saturday',
    cte.SUNDAY: 'Sunday',
    cte.HOLIDAY: 'Holidays',
    cte.WINTER_DESIGN_DAY: 'WinterDesignDay',
    cte.SUMMER_DESIGN_DAY: 'SummerDesignDay'
  }

  def __init__(self, city, output_path, idf_file_path, idd_file_path, epw_file_path, export_type="Surfaces",
               target_buildings=None, adjacent_buildings=None):
    self._city = city
    self._output_path = str(output_path.resolve())
    self._output_file = str((output_path / f'{city.name}.idf').resolve())
    self._export_type = export_type
    self._idd_file_path = str(idd_file_path)
    self._idf_file_path = str(idf_file_path)
    self._epw_file_path = str(epw_file_path)
    IDF.setiddname(self._idd_file_path)
    self._idf = IDF(self._idf_file_path, self._epw_file_path)
    self._idf.newidfobject(self._SCHEDULE_LIMIT, Name=self._ANY_NUMBER)
    self._idf.newidfobject(self._SCHEDULE_LIMIT, Name=self._FRACTION, Lower_Limit_Value=0.0, Upper_Limit_Value=1.0,
                           Numeric_Type=self._CONTINUOUS)
    self._idf.newidfobject(self._SCHEDULE_LIMIT, Name=self._ON_OFF, Lower_Limit_Value=0, Upper_Limit_Value=1,
                           Numeric_Type=self._DISCRETE)
    self._target_buildings = target_buildings
    if target_buildings is None:
      self._target_buildings = [building.name for building in self._city.buildings]
    self._adjacent_buildings = adjacent_buildings
    if self._adjacent_buildings is None:
      self._adjacent_buildings = []
    self._export()


  @staticmethod
  def _matrix_to_list(points, lower_corner):
    lower_x = lower_corner[0]
    lower_y = lower_corner[1]
    lower_z = lower_corner[2]
    points_list = []
    for point in points:
      point_tuple = (point[0] - lower_x, point[1] - lower_y, point[2] - lower_z)
      points_list.append(point_tuple)
    return points_list

  @staticmethod
  def _matrix_to_2d_list(points):
    points_list = []
    for point in points:
      point_tuple = (point[0], point[1])
      points_list.append(point_tuple)
    return points_list

  def _add_material(self, layer):
    for material in self._idf.idfobjects[self._MATERIAL]:
      if material.Name == layer.material.name:
        return
    for material in self._idf.idfobjects[self._MATERIAL_NOMASS]:
      if material.Name == layer.material.name:
        return
    if layer.material.no_mass:
      self._idf.newidfobject(self._MATERIAL_NOMASS,
                             Name=layer.material.name,
                             Roughness=self._ROUGHNESS,
                             Thermal_Resistance=layer.material.thermal_resistance,
                             Thermal_Absorptance=layer.material.thermal_absorptance,
                             Solar_Absorptance=layer.material.solar_absorptance,
                             Visible_Absorptance=layer.material.visible_absorptance
                             )
    else:
      self._idf.newidfobject(self._MATERIAL,
                             Name=layer.material.name,
                             Roughness=self._ROUGHNESS,
                             Thickness=layer.thickness,
                             Conductivity=layer.material.conductivity,
                             Density=layer.material.density,
                             Specific_Heat=layer.material.specific_heat,
                             Thermal_Absorptance=layer.material.thermal_absorptance,
                             Solar_Absorptance=layer.material.solar_absorptance,
                             Visible_Absorptance=layer.material.visible_absorptance
                             )

  def _add_standard_compact_hourly_schedule(self, usage, schedule_type, schedules):
    for schedule in self._idf.idfobjects[self._COMPACT_SCHEDULE]:
      if schedule.Name == f'{schedule_type} schedules {usage}':
        return
    _kwargs = {'Name': f'{schedule_type} schedules {usage}',
               'Schedule_Type_Limits_Name': self.idf_type_limits[schedules[0].data_type],
               'Field_1': 'Through: 12/31'}
    counter = 1
    for j, schedule in enumerate(schedules):
      _val = schedule.values
      _new_field = ''
      for day_type in schedule.day_types:
        _new_field += f' {self.idf_day_types[day_type]}'
      _kwargs[f'Field_{j * 25 + 2}'] = f'For:{_new_field}'
      counter += 1
      for i in range(0, len(_val)):
        _kwargs[f'Field_{j * 25 + 3 + i}'] = f'Until: {i + 1:02d}:00,{_val[i]}'
        counter += 1
    _kwargs[f'Field_{counter + 1}'] = f'For AllOtherDays'
    _kwargs[f'Field_{counter + 2}'] = f'Until: 24:00,0.0'
    self._idf.newidfobject(self._COMPACT_SCHEDULE, **_kwargs)

  def _write_schedules_file(self, usage, schedule):
    file_name = str((Path(self._output_path) / f'{schedule.type} schedules {usage}.dat').resolve())
    with open(file_name, 'w') as file:
      for value in schedule.values:
        file.write(f'{str(value)},\n')
    return file_name

  def _add_file_schedule(self, usage, schedule, file_name):
    _schedule = self._idf.newidfobject(self._FILE_SCHEDULE, Name=f'{schedule.type} schedules {usage}')
    _schedule.Schedule_Type_Limits_Name = self.idf_type_limits[schedule.data_type]
    _schedule.File_Name = file_name
    _schedule.Column_Number = 1
    _schedule.Rows_to_Skip_at_Top = 0
    _schedule.Number_of_Hours_of_Data = 8760
    _schedule.Column_Separator = 'Comma'
    _schedule.Interpolate_to_Timestep = 'No'
    _schedule.Minutes_per_Item = 60

  def _add_infiltration_schedules(self, thermal_zone):
    _infiltration_schedules = []
    for hvac_availability_schedule in thermal_zone.thermal_control.hvac_availability_schedules:
      _schedule = Schedule()
      _schedule.type = cte.INFILTRATION
      _schedule.data_type = cte.FRACTION
      _schedule.time_step = cte.HOUR
      _schedule.time_range = cte.DAY
      _schedule.day_types = copy.deepcopy(hvac_availability_schedule.day_types)
      _infiltration_values = []
      for hvac_value in hvac_availability_schedule.values:
        if hvac_value == 0:
          _infiltration_values.append(thermal_zone.infiltration_rate_system_off)
        else:
          _infiltration_values.append(thermal_zone.infiltration_rate_system_on)
      _schedule.values = _infiltration_values
      _infiltration_schedules.append(_schedule)
    for schedule in self._idf.idfobjects[self._HOURLY_SCHEDULE]:
      if schedule.Name == f'Infiltration schedules {thermal_zone.usage}':
        return
    return self._add_standard_compact_hourly_schedule(thermal_zone.usage, 'Infiltration', _infiltration_schedules)

  def _add_people_activity_level_schedules(self, thermal_zone):
    _occ = thermal_zone.occupancy
    if _occ.occupancy_density == 0:
      _total_heat = 0
    else:
      _total_heat = (_occ.sensible_convective_internal_gain + _occ.sensible_radiative_internal_gain
                     + _occ.latent_internal_gain) / _occ.occupancy_density
    for schedule in self._idf.idfobjects[self._COMPACT_SCHEDULE]:
      if schedule.Name == f'Activity Level schedules {thermal_zone.usage}':
        return
    _kwargs = {'Name': f'Activity Level schedules {thermal_zone.usage}',
               'Schedule_Type_Limits_Name': self.idf_type_limits[cte.ANY_NUMBER],
               'Field_1': 'Through: 12/31',
               'Field_2': 'For AllDays',
               'Field_3': f'Until: 24:00,{_total_heat}'}
    self._idf.newidfobject(self._COMPACT_SCHEDULE, **_kwargs)
    return

  def _add_schedules(self, usage, schedule_type, new_schedules):
    schedule_from_file = False
    for schedule in new_schedules:
      if len(schedule.values) > 168:  # Hours in one week
        schedule_from_file = True
    if schedule_from_file:
      for schedule in self._idf.idfobjects[self._FILE_SCHEDULE]:
        if schedule.Name == f'{schedule_type} schedules {usage}':
          return
      file_name = self._write_schedules_file(usage, new_schedules[0])
      return self._add_file_schedule(usage, new_schedules[0], file_name)
    else:
      for schedule in self._idf.idfobjects[self._HOURLY_SCHEDULE]:
        if schedule.Name == f'{schedule_type} schedules {usage}':
          return
      return self._add_standard_compact_hourly_schedule(usage, schedule_type, new_schedules)

  def _add_construction(self, thermal_boundary):
    for construction in self._idf.idfobjects[self._CONSTRUCTION]:
      if thermal_boundary.parent_surface.vegetation is not None:
        if construction.Name == f'{thermal_boundary.construction_name}_{thermal_boundary.parent_surface.vegetation.name}':
          return
      else:
        if construction.Name == thermal_boundary.construction_name:
          return
    if thermal_boundary.layers is None:
      for material in self._idf.idfobjects[self._MATERIAL]:
        if material.Name == "DefaultMaterial":
          return
      self._idf.set_default_constructions()
      return
    for layer in thermal_boundary.layers:
      self._add_material(layer)
    layers = thermal_boundary.layers
    # The constructions should have at least one layer
    if thermal_boundary.parent_surface.vegetation is not None:
      _kwargs = {'Name': f'{thermal_boundary.construction_name}_{thermal_boundary.parent_surface.vegetation.name}',
                 'Outside_Layer': thermal_boundary.parent_surface.vegetation.name}
      for i in range(0, len(layers) - 1):
        _kwargs[f'Layer_{i + 2}'] = layers[i].material.name
    else:
      _kwargs = {'Name': thermal_boundary.construction_name, 'Outside_Layer': layers[0].material.name}
      for i in range(1, len(layers) - 1):
        _kwargs[f'Layer_{i + 1}'] = layers[i].material.name
    self._idf.newidfobject(self._CONSTRUCTION, **_kwargs)

  def _add_window_construction_and_material(self, thermal_opening):
    for window_material in self._idf.idfobjects[self._WINDOW_MATERIAL_SIMPLE]:
      if window_material['UFactor'] == thermal_opening.overall_u_value and \
         window_material['Solar_Heat_Gain_Coefficient'] == thermal_opening.g_value:
        return

    order = str(len(self._idf.idfobjects[self._WINDOW_MATERIAL_SIMPLE]) + 1)
    material_name = 'glazing_' + order
    _kwargs = {'Name': material_name, 'UFactor': thermal_opening.overall_u_value,
               'Solar_Heat_Gain_Coefficient': thermal_opening.g_value}
    self._idf.newidfobject(self._WINDOW_MATERIAL_SIMPLE, **_kwargs)

    window_construction_name = 'window_construction_' + order
    _kwargs = {'Name': window_construction_name, 'Outside_Layer': material_name}
    self._idf.newidfobject(self._CONSTRUCTION, **_kwargs)

  def _add_zone(self, thermal_zone, name):
    for zone in self._idf.idfobjects['ZONE']:
      if zone.Name == name:
        return
    # todo: what do we need to define a zone in energy plus?
    self._idf.newidfobject(self._ZONE, Name=name, Volume=thermal_zone.volume)
    self._add_heating_system(thermal_zone, name)

  def _add_thermostat(self, thermal_zone):
    thermostat_name = f'Thermostat {thermal_zone.usage}'
    for thermostat in self._idf.idfobjects[self._THERMOSTAT]:
      if thermostat.Name == thermostat_name:
        return thermostat
    # todo: change schedules to schedule name and create schedules using the add_schedule function
    return self._idf.newidfobject(self._THERMOSTAT,
                                  Name=thermostat_name,
                                  Heating_Setpoint_Schedule_Name=f'Heating thermostat schedules {thermal_zone.usage}',
                                  Cooling_Setpoint_Schedule_Name=f'Cooling thermostat schedules {thermal_zone.usage}')

  def _add_heating_system(self, thermal_zone, zone_name):
    for air_system in self._idf.idfobjects[self._IDEAL_LOAD_AIR_SYSTEM]:
      if air_system.Zone_Name == zone_name:
        return
    thermostat = self._add_thermostat(thermal_zone)
    self._idf.newidfobject(self._IDEAL_LOAD_AIR_SYSTEM,
                           Zone_Name=zone_name,
                           System_Availability_Schedule_Name=f'HVAC AVAIL SCHEDULES {thermal_zone.usage}',
                           Heating_Availability_Schedule_Name=f'HVAC AVAIL SCHEDULES {thermal_zone.usage}',
                           Cooling_Availability_Schedule_Name=f'HVAC AVAIL SCHEDULES {thermal_zone.usage}',
                           Template_Thermostat_Name=thermostat.Name)

  def _add_occupancy(self, thermal_zone, zone_name):
    number_of_people = thermal_zone.occupancy.occupancy_density * thermal_zone.total_floor_area
    fraction_radiant = thermal_zone.occupancy.sensible_radiative_internal_gain / \
                       (thermal_zone.occupancy.sensible_radiative_internal_gain +
                        thermal_zone.occupancy.sensible_convective_internal_gain)
    self._idf.newidfobject(self._PEOPLE,
                           Name=f'{zone_name}_occupancy',
                           Zone_or_ZoneList_Name=zone_name,
                           Number_of_People_Schedule_Name=f'Occupancy schedules {thermal_zone.usage}',
                           Number_of_People_Calculation_Method="People",
                           Number_of_People=number_of_people,
                           Fraction_Radiant=fraction_radiant,
                           Activity_Level_Schedule_Name=f'Activity Level schedules {thermal_zone.usage}'
                           )

  def _add_infiltration(self, thermal_zone, zone_name):
    for zone in self._idf.idfobjects["ZONE"]:
      if zone.Name == f'{zone_name}_infiltration':
        return
    self._idf.newidfobject(self._INFILTRATION,
                           Name=f'{zone_name}_infiltration',
                           Zone_or_ZoneList_Name=zone_name,
                           Schedule_Name=f'Infiltration schedules {thermal_zone.usage}',
                           Design_Flow_Rate_Calculation_Method='AirChanges/Hour',
                           Air_Changes_per_Hour=thermal_zone.mechanical_air_change
                           )

  def _rename_building(self, city_name):
    name = str(str(city_name.encode("utf-8")))
    for building in self._idf.idfobjects[self._BUILDING]:
      building.Name = f'Buildings in {name}'
      building['Solar_Distribution'] = 'FullExterior'

  def _remove_sizing_periods(self):
    while len(self._idf.idfobjects[self._SIZING_PERIODS]) > 0:
      self._idf.popidfobject(self._SIZING_PERIODS, 0)

  def _remove_location(self):
    self._idf.popidfobject(self._LOCATION, 0)

  def _export(self):
    """
    Export the idf file into the given path.

    If buildings to calculate are provided, only those will appear in the output variables, otherwise all the city
    buildings will be calculated.
    If adjacent buildings are provided those buildings will be calculated, but will not appear in the output variables.

    export type = "Surfaces|Block"
    """

    self._remove_location()
    self._remove_sizing_periods()
    self._rename_building(self._city.name)
    self._lod = self._city.level_of_detail.geometry
    for building in self._city.buildings:

      for internal_zone in building.internal_zones:
        for thermal_zone in internal_zone.thermal_zones:
          for thermal_boundary in thermal_zone.thermal_boundaries:
            self._add_construction(thermal_boundary)
            if thermal_boundary.parent_surface.vegetation is not None:
              self._add_vegetation_material(thermal_boundary.parent_surface.vegetation)
            for thermal_opening in thermal_boundary.thermal_openings:
              self._add_window_construction_and_material(thermal_opening)
          usage = thermal_zone.usage
          if building.name in self._target_buildings or building.name in self._adjacent_buildings:
            self._add_infiltration_schedules(thermal_zone)
            self._add_schedules(usage, 'Occupancy', thermal_zone.occupancy.occupancy_schedules)
            self._add_schedules(usage, 'HVAC AVAIL', thermal_zone.thermal_control.hvac_availability_schedules)
            self._add_schedules(usage, 'Heating thermostat', thermal_zone.thermal_control.heating_set_point_schedules)
            self._add_schedules(usage, 'Cooling thermostat', thermal_zone.thermal_control.cooling_set_point_schedules)
            self._add_people_activity_level_schedules(thermal_zone)

            self._add_zone(thermal_zone, building.name)
            self._add_heating_system(thermal_zone, building.name)
            self._add_infiltration(thermal_zone, building.name)
            self._add_occupancy(thermal_zone, building.name)
      if self._export_type == "Surfaces":
        if building.name in self._target_buildings or building.name in self._adjacent_buildings:
          self._add_surfaces(building, building.name)
        else:
          self._add_shading(building)
      else:
        self._add_block(building)
    # todo: this should change to specific variables per zone to process only the ones in the buildings_to_calculate
    for building in self._target_buildings:
      continue

    self._idf.newidfobject(
        "OUTPUT:VARIABLE",
        Variable_Name="Zone Ideal Loads Supply Air Total Heating Energy",
        Reporting_Frequency="Hourly",
        )

    self._idf.newidfobject(
        "OUTPUT:VARIABLE",
        Variable_Name="Zone Ideal Loads Supply Air Total Cooling Energy",
        Reporting_Frequency="Hourly",
        )
    self._idf.match()
    try:
      self._idf.intersect_match()
    except IndexError:
      # seems to be a bug from geomeppy when surfaces cannot be intersected
      pass
    self._idf.saveas(str(self._output_file))
    return self._idf

  def run(self):
    """
    Start the energy plus simulation
    """
    self._idf.run(expandobjects=False, readvars=True, output_directory=self._output_path,
                  output_prefix=f'{self._city.name}_')

  def _add_block(self, building):
    _points = self._matrix_to_2d_list(building.foot_print.coordinates)
    self._idf.add_block(name=building.name, coordinates=_points, height=building.max_height,
                        num_stories=int(building.storeys_above_ground))

    for surface in self._idf.idfobjects[self._SURFACE]:
      for thermal_zone in building.thermal_zones:
        for boundary in thermal_zone.thermal_boundaries:
          if surface.Type == self.idf_surfaces[boundary.surface.type]:
            surface.Construction_Name = boundary.construction_name
            break
        for usage_zone in thermal_zone.usage_zones:
          surface.Zone_Name = usage_zone.id
          break
        break
    self._idf.intersect_match()

  def _add_shading(self, building):
    for surface in building.surfaces:
      shading = self._idf.newidfobject(self._SHADING, Name=f'{surface.name}')
      coordinates = self._matrix_to_list(surface.solid_polygon.coordinates,
                                         self._city.lower_corner)
      shading.setcoords(coordinates)
      solar_reflectance = surface.short_wave_reflectance
      self._idf.newidfobject(self._SHADING_PROPERTY,
                             Shading_Surface_Name=f'{surface.name}',
                             Diffuse_Solar_Reflectance_of_Unglazed_Part_of_Shading_Surface=solar_reflectance,
                             Fraction_of_Shading_Surface_That_Is_Glazed=0)

    # todo: Add properties for that name

  def _add_surfaces(self, building, zone_name):
    for internal_zone in building.internal_zones:
      for thermal_zone in internal_zone.thermal_zones:
        for boundary in thermal_zone.thermal_boundaries:
          idf_surface_type = self.idf_surfaces[boundary.parent_surface.type]
          outside_boundary_condition = 'Outdoors'
          sun_exposure = 'SunExposed'
          wind_exposure = 'WindExposed'
          if boundary.parent_surface.type == cte.GROUND:
            outside_boundary_condition = 'Ground'
            sun_exposure = 'NoSun'
            wind_exposure = 'NoWind'
          if boundary.parent_surface.vegetation is not None:
            construction_name = f'{boundary.construction_name}_{boundary.parent_surface.vegetation.name}'
          else:
            construction_name = boundary.construction_name
          surface = self._idf.newidfobject(self._SURFACE, Name=f'{boundary.parent_surface.name}',
                                           Surface_Type=idf_surface_type,
                                           Zone_Name=zone_name,
                                           Construction_Name=construction_name,
                                           Outside_Boundary_Condition=outside_boundary_condition,
                                           Sun_Exposure=sun_exposure,
                                           Wind_Exposure=wind_exposure)
          coordinates = self._matrix_to_list(boundary.parent_surface.solid_polygon.coordinates,
                                             self._city.lower_corner)

          surface.setcoords(coordinates)

    if self._lod >= 3:
      for internal_zone in building.internal_zones:
        for thermal_zone in internal_zone.thermal_zones:
          for boundary in thermal_zone.thermal_boundaries:
            self._add_windows_by_vertices(boundary)
    else:
      # idf only allows setting wwr for external walls
      wwr = 0
      for surface in building.surfaces:
        if surface.type == cte.WALL:
          wwr = surface.associated_thermal_boundaries[0].window_ratio
      self._idf.set_wwr(wwr, construction='window_construction_1')

  def _add_windows_by_vertices(self, boundary):
    raise NotImplementedError

  def _compare_window_constructions(self, window_construction, opening):
    glazing = window_construction['Outside_Layer']
    for material in self._idf.idfobjects[self._WINDOW_MATERIAL_SIMPLE]:
      if material['Name'] == glazing:
        if material['UFactor'] == opening.overall_u_value and \
           material['Solar_Heat_Gain_Coefficient'] == opening.g_value:
          return True
    return False

  def _add_vegetation_material(self, vegetation):
    for vegetation_material in self._idf.idfobjects[self._MATERIAL_ROOFVEGETATION]:
      if vegetation_material.Name == vegetation.name:
        return
    soil = vegetation.soil
    height = 0
    leaf_area_index = 0
    leaf_reflectivity = 0
    leaf_emissivity = 0
    minimal_stomatal_resistance = 0
    for plant in vegetation.plants:
      height += plant.percentage * plant.height
      leaf_area_index += plant.percentage * plant.leaf_area_index
      leaf_reflectivity += plant.percentage * plant.leaf_reflectivity
      leaf_emissivity += plant.percentage * plant.leaf_emissivity
      minimal_stomatal_resistance += plant.percentage * plant.minimal_stomatal_resistance
    self._idf.newidfobject(self._MATERIAL_ROOFVEGETATION,
                           Name=vegetation.name,
                           Height_of_Plants=height,
                           Leaf_Area_Index=leaf_area_index,
                           Leaf_Reflectivity=leaf_reflectivity,
                           Leaf_Emissivity=leaf_emissivity,
                           Minimum_Stomatal_Resistance=minimal_stomatal_resistance,
                           Soil_Layer_Name=soil.name,
                           Roughness=soil.roughness,
                           Thickness=vegetation.soil_thickness,
                           Conductivity_of_Dry_Soil=soil.dry_conductivity,
                           Density_of_Dry_Soil=soil.dry_density,
                           Specific_Heat_of_Dry_Soil=soil.dry_specific_heat,
                           Thermal_Absorptance=soil.thermal_absorptance,
                           Solar_Absorptance=soil.solar_absorptance,
                           Visible_Absorptance=soil.visible_absorptance,
                           Saturation_Volumetric_Moisture_Content_of_the_Soil_Layer=
                           soil.saturation_volumetric_moisture_content,
                           Residual_Volumetric_Moisture_Content_of_the_Soil_Layer=
                           soil.residual_volumetric_moisture_content,
                           Initial_Volumetric_Moisture_Content_of_the_Soil_Layer=
                           soil.initial_volumetric_moisture_content,
                           Moisture_Diffusion_Calculation_Method=self._SIMPLE)