Heilan is a cross-platform OpenGL X3D browser written in C and designed for audiovisual performance. Specifically, it forms the environment within which I developed an audiovisual instrument (Ashitaka) for my PhD. As such, it has a number of features not commonly found in X3D browsers:
Low latency audio courtesy of PortAudio (ASIO, DirectX, MME on Windows; Jack, ALSA, OSS on Linux; CoreAudio on OSX).
A 1st order B-format Ambisonic audio engine, allowing for full 3d sound, capable of accommodating virtually any speaker configuration.
Open Sound Control support for all nodes, allowing a node's attributes to be manipulated in realtime, potentially by multiple users.
A multi-threaded audio engine, able to split off different nodes' audio processing into separate threads (and potentially, separate cpus/cores). This can be configured by the scene author.
With Controller Editor, you can precisely define which MIDI message has to be sent upon any action you do on your Native Instruments controller.
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