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Show HN: Cartopolis, interactive globe-sized 3D world

code.garage44.eu19 points6 comments
Screenshot of Show HN: Cartopolis, interactive globe-sized 3D world

Cartopolis is a self-hostable, networked 3D world that renders a globe-sized, walkable copy of real places so people can inspect built fabric and converse where they stand. It runs in browser (WebGPU), desktop and Android, supports avatars, proximity voice, local and world chat, end-to-end‑encrypted private chats, place links, saved pins and photo notes, and in-world objects and scripts. It offers real sun, weather, routing for walking/biking/driving, live transit where available, moderation tools, and the ability to drop in higher-fidelity models or export/import content via HTTP.

The implementation is Rust-first and built on Bevy with a Tokio/SQLite simulator and separate atlas pipelines that ingest national registers (BAG, 3DBAG, AHN, BGT, PDOK imagery) for the Netherlands and fall back to OpenStreetMap elsewhere. Code is modular: client, atlas, e2ee, simulator, geo crates and a big_space fork for planet-scale coordinates. Releases are provided, binaries require AVX2/FMA, and building needs Rust, a C compiler and GPU drivers; assets use Git LFS. Licensing is MIT or Apache-2.0, with data and assets under their original open licenses. Recent commits focus on bot and MCP session robustness, UI and map refinements.

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