CSLModernMap Code Mod

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The Cities: Skylines and Cities: Skylines II code mods for CSLModernMap. Both export the current city as a compressed .cmm.gz map file.

This repository contains the in-game Code Mod source in CS1/ and CS2/. Renderer source and prebuilt payloads are not included. Official mod releases include the companion viewer, which reads exported maps without accessing game saves.

Features

• Exports roads, tracks, buildings, functional areas, public transport, terrain, water, and native traffic snapshots.
• Writes gzip-compressed UTF-8 JSON using the cmm-v1 schema.
• Opens completed exports with the companion renderer included in official releases.
• Preserves native and custom names, area ownership, and facility relationships.
• Shows export and installation progress, with settings available in 12 languages.

Build

CS1 requires Windows, .NET SDK 10 and local game/mod references; see CS1 build setup. CS2 requires Windows, .NET SDK 8+ and the official Cities: Skylines II modding toolchain.

# Cities: Skylines
dotnet build CS1\CSLModernMap.csproj -c Release
# Cities: Skylines II
dotnet build CS2\CSLModernMapCs2.csproj -c Release

The CS1 build produces a verified CS1/bin/private/CSLModernMap.dll. The CS2 build also deploys into the local game Mods directory; exit CS2 first. Game/mod assemblies and viewer payloads must be supplied separately. The mods do not download required files from the network.

License

The Code Mod source is MIT-licensed. See LICENSE and THIRD_PARTY_NOTICES.md, including the Carto notice shipped with the mod.

Contributors

• Liuiuera
• OpenAI Codex

Some code and documentation were generated with AI assistance and reviewed by the project maintainer.