LeapMotion发布了新的Orion版SDK-小明编程

前几日LeapMotion官网宣布发布新的SDK，称为Orion（也就是SDK 3.x.x了）。起始LeapMotion很早就已经开始做针对头部的SDK，包含在LeapMotion SDK中，并且之前没有特地换个名字拿出来宣传。

我们回顾下，第一版本SDK只有五个手指和手心的位置，第二个版本SDK可以识别了所有的手指甚至手臂的关节点，现在第三个版本专门为VR设备打造。也算LeapMotion沉寂很久重新燃起的希望，再过几天也就是LeapMotion发布的3周年了。虽然LeapMotion的硬件没有发生变化，但是SDK不断更新，存活时间之长和Kinect一样。在过去2.5年里，他们几乎每个月发布一个新的SDK，而从2.3.1后沉寂半年发布了3.0.0SDK。如果你不开发VR应用，我认为没必要下载这个SDK了，因为他是为VR而设计的（虽然它依旧兼容以前1.x和2.x的程序），调试用的观察器也编程VR才可以用的了。本人目前没有VR设备，暂时不进行相关折腾啦。

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下载后发现，新的SDK是专门为VR开发设计的，如果你手头没有VR设备下载这个SDK无法运行看到LeapMotion的效果。如下图无法运行观察器：

leapmotionorion

看下3.0.0 SDK的更新吧（如果你需要下载最新的sdk，请点击这里找到地址）：

Leap Motion Orion: Beta Release Notes

What’s New

Greater robustness to cluttered backgrounds and ambient light interference
Enhanced tracking range that extends to the full length of your arms
Faster and better initialization for all hands
Lower latency
Significantly improved grab-and-drop interactions
Lower overall CPU usage
Much better finger flexibility allowing for better poses
Better tracking on the edge of the field of view
Added a new simple visualizer (VR and Desktop) to the tray menu
Various control panel updates
The Unity assets now use a C# binding to a C-language library rather than the SWIG-generated C++ bindings. The new C# API is more performant, especially for VR, and slightly different than the previous one, especially for images. Currently this new C# API is only used for the new Unity assets

Known issues

HP devices are not supported on Orion. Please use the V2 Desktop (v2.3.1) link above
The skeleton hand can shift slightly away from the hand as you move left or right; most noticeable in apps that use Image Hands and also display the skeletal hands
Tracking may not work as well with bracelets, watches, sleeves, etc
Hands that overlap will not track like they did in V2, often killing one hand or both
Tools are not currently supported in Orion
Tracking along the x-axis may appear slightly skewed
Some poses are not currently tracked as well as V2; this can be seen in the form of occasional bad initialization/reinitialization, right/left misinterpretation, and wrong poses
Desktop mode initialization is not as reliable as HMD mode initialization
It is harder to get a passing score in Recalibrate
Software log is occasionally outputting corrupt characters
Pausing/Resuming Tracking can cause the FPS to drop. The workaround is to disconnect and then reconnect the device to bring the FPS back to normal
Serialized invalid frames are marked as valid when deserialized
Images cannot be extracted from serialized frames
Avast! Antivirus can interfere with Leap Motion Service installation (disable shields to work around)
The latest version of the Oculus firmware limits bandwidth for the DK2’s built-in USB port, which harms the controller’s performance. For now, we recommend using the free cable extender bundled with the mount to connect the controller directly to the computer
Tracking performance may degrade when near large reflective surfaces like white walls or infrared-reflective curtains.
Minimized or out-of-focus applications using the HMD policy flag can affect the service state. Close such programs before switching back to non-VR apps