Damien Pegoraro

Scaleform, Unity3D & FlashDevelop


If you’ve ever tried building GUI with Unity3D, you may know how painful it can be.
Made by Autodesk, Scaleform gives you the ability to add a Flash layer to your 3D projet to make things easier.

Here’s a little walthrough to start creating GUI in a Unity + Flash Develop context.

This tutorial is meant to be as simple as possible and is focused on the workflow. No big code involved!

First of all, download an evaluation copy of Scaleform and unzip it somewhere. (give a valid mail to grab your licence key).

Scaleform Public SDK Downloads  Autodesk Gameware - Google Chrome

Create a new Unity3D project without using any default package.

Import Scaleform unitypackage to your project.

Assets -> Import package -> custom package -> your Scaleform_Unity_Integration-Evaluation.unitypackage

This operation may take a while. Grab a coffee.

If this error shows up, just forget it, we don’t care about 3DS max for now.

3ds Max could not be found.
Make sure that 3ds Max is installed and the max file has 3ds Max as its ‘Open with’ application!

Let’s try the sample scene:

Open Assets/scenes/main_level , don’t save your empty useless opened scene, and hit run.

Play with the demo to get a quick overview of the features :

– Sweet fonts, render textures, 3D-> flash -> 3D interactions …

Unity - main_level.unity - TutoScaleform - PC, Mac & Linux Standalone

My Unity was crashing at this point because of some DX11 issue. I just had to convert my project to DX9 :

Edit -> Project Settings -> Player -> untick use Direct3D 11

That’s cool, but what we’re really trying to achieve is building our first GUI from scratch.

Now let’s create our own scene named myfirstgui in Assets/scenes.

What we’re trying to achieve is a SWF gui with a button calling a Unity method.
This method will invoke some callback on our SWF.

First of all, create a C# script that will be the proxy for our SWF:


using System;
using System.Collections;
using UnityEngine;
using Scaleform;

public class ScaleFormGUI : Movie {

protected Value theMovie = null;
private SFCamera parent = null;

public ScaleFormGUI(SFCamera parent, SFManager sfmgr, SFMovieCreationParams cp) :
base(sfmgr, cp)
this.parent = parent;
SFMgr = sfmgr;

public void OnRegisterSWFCallback(Value movieRef)
theMovie = movieRef;

public void TestCallback()
Debug.Log("CALLED ") ;


We put two callbacks : OnRegisterSWFCallback will be called when swf is ready, TestCallback will be called on mouse click.

We then have to write a Scaleform camera script :

using UnityEngine;
using System.Runtime.InteropServices;
using System;
using System.IO;
using System.Collections;
using Scaleform;

public class ScaleformCamera : SFCamera {

public ScaleFormGUI myGUI = null ;

new public IEnumerator Start()
// The eval key must be set before any Scaleform related classes are loaded, other Scaleform Initialization will not
// take place.
#elif UNITY_WP8

InitParams.TheToleranceParams.Epsilon = 1e-5f;
InitParams.TheToleranceParams.CurveTolerance = 1.0f;
InitParams.TheToleranceParams.CollinearityTolerance = 10.0f;
InitParams.TheToleranceParams.IntersectionEpsilon = 1e-3f;
InitParams.TheToleranceParams.FillLowerScale = 0.0707f;
InitParams.TheToleranceParams.FillUpperScale = 100.414f;
InitParams.TheToleranceParams.FillAliasedLowerScale = 10.5f;
InitParams.TheToleranceParams.FillAliasedUpperScale = 200.0f;
InitParams.TheToleranceParams.StrokeLowerScale = 10.99f;
InitParams.TheToleranceParams.StrokeUpperScale = 100.01f;
InitParams.TheToleranceParams.HintedStrokeLowerScale = 0.09f;
InitParams.TheToleranceParams.HintedStrokeUpperScale = 100.001f;
InitParams.TheToleranceParams.Scale9LowerScale = 10.995f;
InitParams.TheToleranceParams.Scale9UpperScale = 100.005f;
InitParams.TheToleranceParams.EdgeAAScale = 0.95f;
InitParams.TheToleranceParams.MorphTolerance = 0.001f;
InitParams.TheToleranceParams.MinDet3D = 10.001f;
InitParams.TheToleranceParams.MinScale3D = 10.05f;

InitParams.UseSystemFontProvider = false;
return base.Start();

new public void Update()


private void CreateGameHud()
if (myGUI == null)
myGUI = Util.CreateSwf("mygui.swf", true, new Color32(255, 255, 255, 0));
myGUI.SFMgr.ProcessCommands() ;


Replace your licence key and attach this script to your camera.

We now have to make our mygui.swf with a single button. So let’s create a new AS3 FlashDevelop project.

Here’s my :

import flash.display.Sprite;
import flash.display.StageScaleMode;
import flash.external.ExternalInterface;

public class Main extends Sprite

private var s:Sprite;

public function Main():void
stage.scaleMode = StageScaleMode.NO_SCALE ;
stage.align = "TL" ;
init() ;

private function init():void
s = new Sprite() ;
addChild( s) ; 0x00FF00 ) ; 200, 200, 50 ) ; ;
s.addEventListener(MouseEvent.CLICK, callUnity ) ;

if ( ExternalInterface.available ){ ("OnRegisterSWFCallback", this);

private function callUnity(e:MouseEvent):void
trace("click") ;
if ( ExternalInterface.available )"TestCallback") ;

public function fromUnity( ) : void
{ ; Math.random() * 0xFFFFFF ) ; 200, 200, 50 ) ; ;


Just notice that calling a Unity method is the same thing as calling a Javascript method with ExternalInterface. Methods that will be called from Unity must be declared as public.

We made a code with a round button that calls a Unity method. This method calls flash again to change the button’s color to random.

Don’t forget to set the output in your Unity project StreamingAssets folder and build your swf.

Now we just have to run our Unity projet and if everything’s okay, clicking the green button should change it’s color.

You should see something like that:

Unity - myfirstgui.unity - TutoScaleform - PC, Mac & Linux Standalone_2

I added a cube on my scene just to show that there’s 3D running in the background…

Note that flash trace calls will be redirected to Unity debug console.

That was pretty easy! Tell me if you read something unclear or wrong!

One Comment on “Scaleform, Unity3D & FlashDevelop

  1. Hi thanks for for everything…man! This rocks! A bit outdated, but I am a caveman too. Unity can make its own as I guess you already know. This however rocks, because I have used Flash for school some time ago. Animating was fun and adding script too was fun. I guess Flash isn’t dead for us ole timers depending how you see it and I am 35, born in November! Tech vs Art. It a memory. But memories get talked about and stimulate Brain dendrite synaptic connections at the burst and speed of light. UDK used scaleform back when I went to AIPOD. A school that liked UDK a lot among the professors. I made an example of such from a tutorial I saw. Please write more as an editorial on this? Its nostalgic and necessarily needed for geeks and nerds who love auto junk yards but for scripting and programming. I imagine. Since I used Flash Develop to do it in last time. Lol, now I am on Ubuntu. This flash thing does it crash the finicky Unity3d on Linux installs?

    Bao-Nguyen Doan
    Game artist
    (WIP: Tower Defense using unity)

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