Unity 3d hand position varies wildly

[IvanTomasevski]

Hello,

I am sorry if this is a simple question but I cannot figuer it out.

I am using the Leap Motion Interaction Engine (1.1.1) and I cannot figuer out how to get the correct "depth" position of the hand.

The code I use to get the hand position:

Vector3 translatedVector = hand.Basis.translation.ToVector3();

I keep the hand at the same distance from my face and I move it up and down. I would assume that at least one value stays the same as I am not stretching my hand out or pullling it towards my face, yet both the y and z values of the hand vary wildly as I move it up and down. How can I correctly get the distance of my hand from my face?

Thank you

[AlexColgan]

If you're moving your hand up and down, you'd expect the Y values to vary wildly, as that's the dimension you're moving in. Is it possible that you're getting the position of the hand in Unity worldspace rather than in relation to the controller?

[IvanTomasevski]

Hi Alex,

Thank you for the prompt response. I would expect Y to change - but why does the Z value then change also? I would expect one value to change while the other stays the same, but both are changing.

"Is it possible that you're getting the position of the hand in Unity worldspace rather than in relation to the controller?"
-> This is very possible as I am a beginner. Can you please provide some code which would demonstrate the difference?

Kind regards,
Ivan

[AlexColgan]

I'm not a programmer so I'm unable to provide code, but I can suggest a simple test. While moving your hand up and down, first ensure that the Leap Motion Controller is as horizontally level as possible, then try it at a prominent angle. If there's a major difference in the Z axis between the two, then you're using the Leap coordinate space. If not, then you're using the Unity coordinate space.

[IvanTomasevski]

Hi,

By "prominent angle" I assume you mean I should tilt the Leap Motion Controller to one side. When I do this there is a major difference in the Z axis compared to when the Leap Motion Controller is flat.

I googled how to convert Leap Space to Unity and found the code:

Leap.Vector position = finger.TipPosition;
Vector3 unityPosition = position.ToUnityScaled(false);
Vector3 worldPosition = handController.transform.TransformPoint(unityPosition);

at:

https://developer.leapmotion.com/documentation/v2/unity/api/Leap_Classes.html

Unfortunatly the code does not work. The Leap Unity Extensions no longer seems to have a toUnityScaled method. Is this a versioning problem?

Thank you,
Ivan

[AlexColgan]

That code is very old You're using the Orion Unity Assets. In any event it sounds like the solution is in your hands (no pun intended). If the XYZ values you're getting are in Leap space, you should be able to easily calculate distance from the origin point (the controller itself).

[IvanTomasevski]

Thank you for the response, I will calculate it myself. Will you guys be adding DEPRECATED tags or at least dates to old code so that we know what code is no longer relevant?

[AlexColgan]

There are two versions of the documentation -- V2 and Orion. You were in the V2 documentation:

Admittedly this could be clearer, so we are preparing some broader changes to how we handle the documentation.