We celebrated a first BRT Challenge in April 2024 to motivate use of the BRT Library. We hope there will be more!

The challenge consisted in creating an app that, either by directly using the BRT C++ API, or via OSC communication with BeRTA (available in the BRT Library releases), was capable of:

• Loading a mono audio sample and creating a BRT sound source
• Loading two or more HRTF sofa files and create a BRT listener.
• Move at least one spatial DoF of listener or sound source. For example, source azimuth.
• Swap HRTFs during rendering for real time HRTF comparison.

We divided in three groups:

1. Grupo 1 used the BRT C++ Api and JUCE to create and app that solves the challenge:
   • This is the link to an example created by Luis Molina-Tanco which Rapolas Daugintis debugged during the workshop -> brt-juce-projucer.
   • This is a work-in-progress VST3 plugin using the JUCE framework and BRT in a CMake project (the BRT library has a CMake branch), created by Nils Marggraff-Turley -> brt-juce-cmake.
2. Grupo 2 used UNITY to create a Virtual Reality app that connected to BeRTA via its OSC interface. The Oculus HMD (they tried Rift, Quest 2 and Quest 3) tracked listener moves and rendered the visual scene, while BeRTA rendered the spatial audio.
3. Grupo 3 used MAX MSP and Python to create apps that solve the challenge.
   • This is the MAX MSP application Maravilloso, Maravilloso created by Lorenzo Picinali -> maxmsp.
   • This is the Python application created by Katarina Poole -> python.