Get Unity world space position in 4.0.2

[jeffwieland]

Using 4.0.2, trying to figure out how to convert a leap position into a unity world space position, in the past I did...

Vector3 palmPos = LeapProvider.leapMat.TransformPoint(hand.PalmPosition).ToVector3();

However LeapProvider is now gone, and leap vectors no longer seem to have a ToVector3 method.

So what is the proper way to calculate a unity world space position?

Thanks!

[Joe_Ward]

Neither LeapProvider nor ToVector3() have been removed. We did change the namespace for the Unity-specific classes to Leap.Unity, so that is probably what is tripping you up.

There was also a change to LeapProvider -- it is now an abstract class and its concrete implementation is now LeapServiceProvider. If you get the frames from the LeapServiceProvider, the coordinates are already transformed. You only need to transform them if you get data directly with Controller.Frame().

Finally, the you can get the Leap-style transform matrix from any Unity transform with:

Matrix leapMat = UnityMatrixExtension.GetLeapMatrix(gameObject.transform);

(FYI, GetLeapMatrix() will change again since it is supposed to be an extension method.)

Again, you would only want to use GetLeapMatrix() if you are getting data directly with Controller.Frame() and want a different transform then that used by the LeapServiceProvider object -- which uses the transform of the LeapHandController game object.

[jeffwieland]

Ok looks like the namespace change was causing issues.

So to get a frame in the past I would create a new "Controller" and call "controller.Frame()". Now you're saying I should...

         LeapServiceProvider leapProvider = GameObject.Find("LeapHandController").GetComponent<LeapServiceProvider>();
leapProvider.CurrentFrame...

correct?

[Joe_Ward]

Essentially. I think GameObject.Find is a rather expensive operation, so you should probably avoid doing that more than once for an object, though -- or avoid it altogether by manually setting it in the editor.

Using this approach, you only have to use ToVector3() to convert from Leap to Unity vector objects.