Editor Procedural Generation

To procedurally generate content in the editor a Scripted Importer is useful.

The parameters of the generation can be stored in JSON format in a file with a unique file extension. For example *.procline for procedurally generated lines:

{
    "vertices": 512
}

In code a Serializable class should be created with the same structure to deserialize this into:

[Serializable]
public class AssetData
{
    [SerializeField] public int vertices;
}

Finally an importer processes these files:

[ScriptedImporter(1, "procline")]
public class ProceduralLineImporter
    : ScriptedImporter
{
    public override void OnImportAsset(AssetImportContext ctx)
    {
        var assetData = JsonUtility.FromJson<AssetData>(File.ReadAllText(ctx.assetPath));

        var mesh = GenerateMesh(assetData.vertices);

        ctx.AddObjectToAsset("mesh", mesh);
        ctx.SetMainObject(mesh);
    }
    private static Mesh GenerateMesh(int points)
    {
        todo: generate mesh!
    }
}

This same pattern can be used for any fixed procedural content generated in editor.

See Generating Meshes for more detail on how you might implement the GenerateMesh method.