Namespace 'Listener' not found, missing assembly reference?

[JWEBB]

I'm part of a group project at Academy of Art University and we're excited to implement Orion into our game.

I'm attempting to emulate the listener found in the Sample.cs in the SDK folder using C# in Unity. However, extending Listener returns with a missing reference. To confirm, my Listener class should look something like this?

using System;
using System.Threading;
using Leap;

class LeapListener : Listener
{
//Do things here.
}

The information in the API documentation for Orion that addresses Listeners is brief, so I'm having a hard time understanding how it's implemented. Perhaps I'm going about this the wrong way?

I'm using the most updated packages and SDK on Windows 10 with Unity 5.3.2p3

EDIT: When I open any HTML file under LeapSDK/docs/cssharp/api the page shows a warning about not finding the class in "doxygen xml output"

[Joe_Ward]

Listeners never worked well in Unity, they often cause crashes because each listener callback is invoked on an independent thread, and Unity doesn't like other threads touching its stuff. In Orion, we have removed the Listener interface altogether.

We recommend just calling Controller.Frame() in the Unity Update() or (for physics) FixedUpdate() functions. That's how our Unity Assets work.

[JWEBB]

Thanks for the reply, Joe.

So this brings me to another issue. I can't seem to get the hand to ever be valid. I've tried waiting until after the hand is initialized to create the hand object to no avail. I don't have my code in front of me right now, but it looks something like this:

private Controller controller;
void Start()
{
    controller = new Controller();
}
void Update()
{

    Frame frame = controller.Frame();
    HandList hands = frame.Hands;

    if(!frame.Hands.IsEmpty)
    {
        Hand firstHand = hands [0];
        Debug.Log(firstHand);         //will return invalid
    }
}

How would I change this code so that the firstHand registers as valid?

[Joe_Ward]

The code is correct. There is a bug in the Hand class constructor were it simply doesn't set the IsValid property to true when a valid hand is constructed. You can ignore the invalid ToString printout.

In the next version we are removing the IsValid property. Since you can create your own Hand objects, we can't truthfully tell if a Hand object is valid or not.