Unity SDK Minimum Hand Distance Control?

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Bryan_Dempsey 2020-08-31 17:35:01 UTC #1

I'm wondering if the Unity SDK allows the minimum hand distance to be as low as possible. Possibly by changing the cameras' field of view? I want to get my hand as close as possible. It won't be moving around and I'm aiming for wrist and finger rotational accuracy (not speed or range of motion) with a "static" hand and fingers.

dankirby 2020-09-02 13:42:06 UTC #2

The minimum tracking distance of the hand from the Leap Motion Controller is approximately two inches (5 cms), below this the tracking is lost as the hand is too close to the IR cameras and distorts/blocks the camera view.

Why would you want the hand to be closer to the device? If you have a bit more information that you can share I might help me understand your end goal a bit better and advise further.

Bryan_Dempsey 2020-09-02 23:22:49 UTC #3

Hi Dan,

I want to attach the controller to a device that is normally no more than 3" from the palm-side of the hand. But, I notice from my own experiments that when I present a "flat" hand at this distance, the fingers appear "slightly curled" and only "straighten out" when I increase this distance to about 8" or 12". I can live with this situation, but I was just wondering if this minimal "good tracking" distance was set by an adjustable field of view setting in the SDK.

I also have some questions about the IR-transparent glass window. Could it be removed in an environment with no light in the "visible" range?

Another more pressing question I have is:

Could the device track accurately if there were 1 or 2 thin, IR-transparent layers of high-optical-purity glass or plexi-glass between the controller and the hand - with or without the built-in controller's own IR-transparent glass window?

My final question is:

Is there some legacy, Unity C# code to record controller data (to make a 3D hand movie with Leap Motion) that will run with Unity 2020 (or newer) ?

I know these are 3 separate questions, but I'm not sure how to generate enough interest or response on forums to get an answer in my own life-time :o)

Bryan Dempsey