This code is able to run / export the latest version of Tango Doodle using Unity 4.

As with any Tango project, the first step is to import the Tango assets into your project.

Download from here: https://developers.google.com/project-tango/downloads

Go to Assets > Import Package > Custom package and select the package file. Leave all assets selected and import them. You should now have a TangoSDK folder in your project.

(NOTE: At this point, unity might be reporting errors in the tango source code. If so, build the project once File > Build and they should go away)

As with all Unity / Tango apps, you'll need to add the prefab at TangoSDK/Core/Prefabs/Tango Manager to your scene, and take a look at it's components. We only need pose data for this demo, not depth, so leave everything as it is.

Take a look at the DrawingRig object in the root of the scene. All of the drawing logic happens in the Sketchpad.cs script, which is attached to a particle system. The "drawing" is actually a regular old ParticleSystem. The only difference is that Looping, Play on awake, Emission, and Shape are all disabled (Leaving Renderer on).

Note that DrawingRig has a TangoSketchController script on it. This is a copy of TangoSDK/Examples/Scripts/Controllers/SampleController.cs, with a bunch of OnGUI debug info disabled. This script is what takes the latest pose (position + rotation) data from the device and applies it to the game object.

The actual drawing logic, in Sketchpad.cs, is fairly standard unity code. Here's how it works:

• Listen for mouse events
• Project a ray onto the InvisibleCanvas plane that is attached to DrawingRig
• Create a bunch of new points from the last point to the new point
• Update the ParticleSystem with the latest points

Check out the source of Sketchpad.cs for more detail.