How to use F# libraries with Unity

Note: this has only been tested out with Xamarin Studio on Mac OS X

1. Create a Unity Project
2. Create a F# project (lib) and put it in the root of the Unity project
3. In the Unity 'Assets' folder, create a folder called 'Frameworks' and add the FSharp.Core.dll to it
4. Open the preferences for the F# project and change the 'Target Framework' to 'Mono / .NET 3.5'
5. Remove all References in the project, except FSharp.Core (2.3.0), System and System.Core
6. Add the unity mscorlib.dll to somewhere in the F# project folder, and then to the project References
7. Make a custom build command (working dir: ${TargetDir}) that copies the resulting dll to the Unity 'Frameworks' folder

    cp MyFsharpLib.dll ../../../../Assets/Frameworks/

• You can access namespaces/classes from C# components just like you'd expect

How to write Unity components in F#

• Copy UnityEngine.dll to the F# project and add it as a reference
• The component will show up under the DLL in Unity's Project view, click the little arrow to fold it out (or just add it to a game object using the Add Component menu)
• Import the Unity namespace

    open UnityEngine

• Inherit from MonoBehaviour, as usual

    type SimpleComponent() =
    inherit MonoBehaviour()
        member this.stuff = 42

• To show properties in the inspector, make them mutable and serializable

    [<SerializeField>]
    let mutable changeSpeed = 2.0f

• Override member functions

    member this.Start () = 
        this.transform.Translate(1.0f, -1.0f, 2.0f)

• Mutate members

    this.renderer.material.color <- Color.red

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