3dgeo-flake

Nix flake packaging CityJSON tools:

Package	Description
val3dity	Validate 3D city models
cjval	Validate CityJSON files and extensions
cjseq	Process CityJSONSeq streams
cjio	CityJSON I/O and manipulation (Python)
flatcitybuf	FlatBuffers-based CityJSON format

Use the dev shell

Drop into a shell with all tools on PATH:

nix develop github:3DGI/3dgeo-flake

Or add a shell.nix / flake.nix to your project (see below).

Add to your nix profile

Add individual tools like:

nix profile add --refresh github:3DGI/3dgeo-flake#packages.x86_64-linux.flatcitybuf

Where the last part (<sytem>.<package>) is one of:

└───packages
    ├───aarch64-darwin
    │   ├───cjio: package 'python3.13-cjio-0.10.1'
    │   ├───cjseq: package 'cjseq-0.3.1'
    │   ├───cjval: package 'cjval-0.8.4'
    │   ├───flatcitybuf: package 'flatcitybuf-0.7.4'
    │   └───val3dity: package 'val3dity-2.6.3'
    ├───aarch64-linux
    │   ├───cjio: package 'python3.13-cjio-0.10.1'
    │   ├───cjseq: package 'cjseq-0.3.1'
    │   ├───cjval: package 'cjval-0.8.4'
    │   ├───flatcitybuf: package 'flatcitybuf-0.7.4'
    │   └───val3dity: package 'val3dity-2.6.3'
    ├───x86_64-darwin
    │   ├───cjio: package 'python3.13-cjio-0.10.1'
    │   ├───cjseq: package 'cjseq-0.3.1'
    │   ├───cjval: package 'cjval-0.8.4'
    │   ├───flatcitybuf: package 'flatcitybuf-0.7.4'
    │   └───val3dity: package 'val3dity-2.6.3'
    └───x86_64-linux
        ├───cjio: package 'python3.13-cjio-0.10.1'
        ├───cjseq: package 'cjseq-0.3.1'
        ├───cjval: package 'cjval-0.8.4'
        ├───flatcitybuf: package 'flatcitybuf-0.7.4'
        └───val3dity: package 'val3dity-2.6.3'

Build a single tool

nix build github:3DGI/3dgeo-flake#cjval
./result/bin/cjval --help

Integrate into your own flake

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    geodev.url = "github:3DGI/3dgeo-flake";
  };

  outputs = { nixpkgs, geodev, ... }:
    let
      system = "aarch64-darwin"; # adjust as needed
      pkgs = nixpkgs.legacyPackages.${system};
    in
    {
      devShells.${system}.default = pkgs.mkShell {
        # merge all 3dgeo tools into your shell; adds them to 'packages'
        inputsFrom = [ geodev.devShells.${system}.default ];

        # add your own packages alongside
        packages = with pkgs; [ gdal ];
      };
    };
}

To use individual packages instead of the whole devshell:

packages = [
  geodev.packages.${system}.cjval
  geodev.packages.${system}.cjseq
];