DF Apply Facade Parameters adds windows also to interior walls between rooms on the same floor

Batiste · October 6, 2025, 2:58pm

Hi everyone,

I’m working on a multi-room floor model in Dragonfly and I’ve run into a common issue with façade generation.

When I use DF Apply Facade Parameters, the component applies windows to all façades, including the interior walls between rooms on the same floor (see attached image).
In this case, these surfaces are actually internal partitions and should not have any apertures.

I’ve already tried running: DF Intersect Rooms2D
DF Solve Adjacencies 2D

before or after applying the façade parameters, but the result is the same — interior walls still get windows.

And I also tried apply the façade parameters at the story level or building level, but the result is the same.

From what I understand, this happens because DF Apply Facade Parameters only looks at the orientation of the surfaces, not their boundary condition, since at the 2D level Dragonfly doesn’t yet know which surfaces are “interior” or “exterior”.

It would be great if Dragonfly could distinguish between exterior and interior walls when multiple Rooms2D share boundaries, so that DF Apply Facade Parameters only applies windows to exterior façades.

I add a picture of the current status:
imagen

chris · October 9, 2025, 7:22pm

Hey @Batiste ,

You can see inside the component source code that the component only applied the windows to the outdoor walls:

github.com

ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src/DF Apply Facade Parameters.py#L81


      
              return rooms
          
          
          if all_required_inputs(ghenv.Component):
              # duplicate the initial objects
              df_obj = [obj.duplicate() for obj in _df_obj]
          
              # add the window parameters
              if len(_win_par_) == 1:  # one window parameter for all
                  for obj in df_obj:
                      obj.set_outdoor_window_parameters(_win_par_[0])
              elif len(_win_par_) > 1:  # different window parameters by cardinal direction
                  angles = angles_from_num_orient(len(_win_par_))
                  rooms = extract_room_2ds(df_obj)
                  for room in rooms:
                      room_win_par = []
                      for bc, orient in zip(room.boundary_conditions, room.segment_orientations()):
                          orient_i = orient_index(orient, angles)
                          win_p = _win_par_[orient_i] if isinstance(bc, Outdoors) else None
                          room_win_par.append(win_p)
                      room.window_parameters = room_win_par

This is true even when you have assigned different facade parameters to be used for different orientations:

github.com

ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src/DF Apply Facade Parameters.py#L89


      
          if len(_win_par_) == 1:  # one window parameter for all
              for obj in df_obj:
                  obj.set_outdoor_window_parameters(_win_par_[0])
          elif len(_win_par_) > 1:  # different window parameters by cardinal direction
              angles = angles_from_num_orient(len(_win_par_))
              rooms = extract_room_2ds(df_obj)
              for room in rooms:
                  room_win_par = []
                  for bc, orient in zip(room.boundary_conditions, room.segment_orientations()):
                      orient_i = orient_index(orient, angles)
                      win_p = _win_par_[orient_i] if isinstance(bc, Outdoors) else None
                      room_win_par.append(win_p)
                  room.window_parameters = room_win_par
          
          # add the shading parameters
          if len(_shd_par_) == 1:  # one shading parameter for all
              for obj in df_obj:
                  obj.set_outdoor_shading_parameters(_shd_par_[0])
          elif len(_shd_par_) > 1:  # different shading parameters by cardinal direction
              angles = angles_from_num_orient(len(_shd_par_))
              rooms = extract_room_2ds(df_obj)

Are you sure that you have set the boundary conditions to be indoors via the “Solve Adjacency” component before you assign facade parameters? If so, can you provide a sample file that recreates your issue?