Rust Wiki

Map Data

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All Rust maps (apart from ones that are made by Facepunch and saved as an Unity scene), are stored in a .map file. When first joining a server that is running a procedural map, Rust will generate the map from the following information:

Size (1000-6000) : Seed (0-9999999999) : MapType (ProcGen/Barren)

The map is then saved into a .map file, and can be found in the Rust install directory inside the maps folder. The map filename will be named MapType.Size.Seed.map

Custom maps are essentially a pre-generated map, which is downloaded from an URL rather than being generated based on certain values.

Data Format

Map files are stored in the format below, and compressed using a LZ4Stream. They first contain the World Serialization number, currently 9 and then the WorldData.

The WorldData is stored in the following format:

public class WorldData { [ProtoMember(1)] public uint size = 4000; // The size of the Terrain, in Unity metres. [ProtoMember(2)] public List<MapData> maps = new List<MapData>(); [ProtoMember(3)] public List<PrefabData> prefabs = new List<PrefabData>(); [ProtoMember(4)] public List<PathData> paths = new List<PathData>(); }

The MapData contains a layer (Ground, Biome, Heightmap etc) and the corresponding ByteMap. It is stored in the following format:

public class MapData { [ProtoMember(1)] public string name; // ByteMap name (terrain, water, ground, topology etc) [ProtoMember(2)] public byte[] data; // The bytemap data. }

The PrefabData contains info on the ID of the prefab, and it’s world space values. It is stored in the following format:

public class PrefabData { [ProtoMember(1)] public string category; // Decor, Monument etc [ProtoMember(2)] public uint id; // PrefabID [ProtoMember(3)] public VectorData position; // Vector3 of the position in world space. [ProtoMember(4)] public VectorData rotation; // Vector3 of the rotation in world space. [ProtoMember(5)] public VectorData scale; // Vector3 of the scale in world space. }

The PathData contains info on the Rivers and Roads of the map. It is stored in the following format:

public class PathData { [ProtoMember(1)] public string name; // River or Road [ProtoMember(2)] public bool spline; [ProtoMember(3)] public bool start; [ProtoMember(4)] public bool end; [ProtoMember(5)] public float width; [ProtoMember(6)] public float innerPadding; [ProtoMember(7)] public float outerPadding; [ProtoMember(8)] public float innerFade; [ProtoMember(9)] public float outerFade; [ProtoMember(10)] public float randomScale; [ProtoMember(11)] public float meshOffset; [ProtoMember(12)] public float terrainOffset; [ProtoMember(13)] public int splat; [ProtoMember(14)] public int topology; [ProtoMember(15)] public VectorData[] nodes; // List of the world spaces of the individual nodes. }

Information gathered provided by the Rust Map Making community.

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