Data and licenses

FlyBrain combines a connectome-derived spiking model with an engineered body and sensorimotor interface. It is not a recovered individual fly or a biologically validated reconstruction of its behavior.

Original foundation

FlyBrain began with Shiu et al.'s 2024 computational brain model and the Drosophila_brain_model repository: a Brian2 leaky integrate-and-fire model using female FAFB/FlyWire wiring, initially v630 and then v783. The original code is copyright Philip Shiu and Nico Spiller, 2023, under MIT. FlyGym/NeuroMechFly supplied the body and senses, with FlyBody flight components added later. MaleCNS is a subsequent, separate dataset integration.

Rust/Metal/WebGPU execution, numerical verification, the room, and the neural/body interface are FlyBrain engineering. They are not upstream biological validation or a port of Eon's unpublished integration.

Connectome

MaleCNS v1.0, from the MaleCNS collaboration and Janelia Research Campus, is available under CC BY 4.0. This model selects annotated neurons, converts known-transmitter directed edges to signed CSR arrays, and omits edges with unsupported transmitter labels. Attribution, source URLs, selection rules, omitted counts and hashes are retained in the pack provenance. Download chunking does not alter the arrays.

Bundled legacy FlyWire v783 neural-I/O annotations derive from the FlyWire community's public annotations, under CC BY-NC 4.0, and were selected into candidate input/output groups. They are distinct from the MaleCNS simulation pack. Credit to the Princeton FlyWire team, Murthy and Seung labs, and community contributors; see the FlyWire citation and data-use guidelines.

Body, physics and rendering

• FlyGym / NeuroMechFly: articulated body, gait and retina assets, modified here for the room, appearance and engineered embodiment. Apache 2.0 license.
• MuJoCo 3.9.0: physics, compiled to WebAssembly. Apache 2.0 license.
• FlyBody: code, wing geometry and fluid-model lineage under Apache 2.0. Its separately released flight datasets and trained policies are GPL-3.0-or-later, including the source of the fitted wing waveform used here. The standalone policy weights are not shipped in this browser bundle.
• Gil-Mor/iFish: fisheye implementation lineage via FlyGym Retina, under MIT.
• mujoco-rs: patched Rust bindings. License.
• Three.js 0.180.0: browser rendering. MIT license.

Scientific references

• Shiu et al. (2024). A Drosophila computational brain model reveals sensorimotor processing.
• Dorkenwald et al. (2024). Neuronal wiring diagram of an adult brain.
• Schlegel et al. (2024). Whole-brain annotation and multi-connectome cell typing of Drosophila.
• Lobato-Rios et al. (2022). NeuroMechFly, a neuromechanical model of adult Drosophila melanogaster.
• Wang-Chen et al. (2024). NeuroMechFly v2: simulating embodied sensorimotor control in adult Drosophila.
• Vaxenburg et al. (2025). Whole-body physics simulation of fruit fly locomotion.
• MaleCNS collaboration (2026). Sexual dimorphism in the complete connectome of the Drosophila male central nervous system.

Additional notices

Original FlyBrain code is MIT; the combined code/data bundle is not uniformly MIT-licensed. FlyWire's noncommercial terms and the flight dataset's GPL terms remain separate from the code licenses. License notices alone do not establish compliance for every possible redistribution. CC BY 4.0 text · CC BY-NC 4.0 text.

FlyBrain license · Rust dependency notices · libccd · LodePNG · miniz · Qhull · tinyobjloader · TinyXML-2