Question regarding absorption and reflection coefficients

[RoyJames]

Hi authors,

Thank you for sharing your great work! I mainly work on geometric acoustics and find your work very promising for follow-up research. I can compile and run the example locally. I have one question while reading your code and report where it says "The walls, the stairs and the furniture are modelled as hard, reflective, nonporous surfaces with an absorbing coefficient of 5%". Does that mean all your reflecting condition assumes 5% absorption and all your absorbing condition assumes 5% reflection? If so, how are they enforced in the code? I do see the m_fBC buffer is relevant but am not sure how these coefficients affect the calculation numerically.

If the current code does not reflect that, can you kindly point me to the right place to modify the code? Basically, I'm wondering how I can use different coefficients by slight modifications.

Thanks, Zhenyu