Complex rooms made with polygons and from corners freezes at room.image_source_model() for microphones with directivity

[whojavumusic]

I made an L shaped room and placed a Genelec_8020 source with HATS microphone given in the example. The code freezes when room.image_source_model() is called. Works fine with shoebox room.

[whojavumusic]

The code freezes in room.image_source_model() at
n_visible_sources = self.room_engine.image_source_model(source.position)

[fakufaku]

Thanks for catching this. Is it possible to share a code snippets that reproduce the problem?

[whojavumusic]

I realized that lower image orders (like 2) usually don't freeze, could it be a computation limitation? Anyway here's the snippet:

import numpy as np
import pyroomacoustics as pra
from pyroomacoustics.directivities import *

corners = np.array([[0,0], [0,5], [1,5], [1,2], [2,2], [2,5], [3,5], [3,0], [2,0], [2,1], [1,1], [1,0]]).T

room = pra.Room.from_corners(
corners,
fs=16000,
max_order=10,
)

room.extrude(3)

rot = Rotation3D([0, 0], "yz", degrees=True)
measurements = MeasuredDirectivityFile("LSPs_HATS_GuitarCabinets_Akustikmessplatz", fs=16000)

source_directivity = measurements.get_source_directivity('Genelec_8020',rot)
room.add_source([1.5,1.5,1.5], source_directivity)

hrtf = MeasuredDirectivityFile(path="mit_kemar_normal_pinna.sofa", fs=16000)
dir_left = hrtf.get_mic_directivity("left", orientation=rot)
dir_right = hrtf.get_mic_directivity("right", orientation=rot)
room.add_microphone([0.5,1.5,1.5], directivity=dir_left)
room.add_microphone([0.5,1.5,1.5], directivity=dir_right)

#freezes afterwards
room.image_source_model()
room.compute_rir()

[fakufaku]

Thanks for providing the code.
I would imagine this is indeed a computational bottleneck. The complexity of the image source method for arbitrary rooms is exponential in the order, i.e., proportional num_walls ** max_order.
I would suggest to use the hybrid simulation method with max_order limited to 2 or 3 and the rest done by ray tracing.

[whojavumusic]

True, but then the ray tracing does not support directivity so it wouldn’t make a realistic reverberation. Is there a plan to implement directivities to ray tracing anytime soon?