使用 LeapMotion 插件跟踪手和手指

The Leap Motion system uses a right-handed Cartesian coordinate system. The origin is centered at the top of the Leap Motion Controller. The X and Z axes lie in the horizontal plane, with the X axis running parallel to the long edge of the device. The Y axis is vertical, with positive values increasing upwards (in contrast to the downward orientation of most computer graphics coordinate systems). The Z axis has positive values increasing toward the user.Leap Motion 系统使用右手笛卡尔坐标系。原点在 Leap Motion 控制器的顶部居中。 X 轴和 Z 轴位于水平面，X 轴平行于设备的长边。 Y 轴是垂直的，正值向上增加（与大多数计算机图形坐标系的向下方向相反）。 Z 轴具有朝向用户增加的正值。

Leap Motion right-handed coordinate systemLeap Motion 右手坐标系

The hand model provides information about the identity, position, and other characteristics of a detected hand, the arm to which the hand is attached, and lists of the fingers associated with the hand.手部模型提供有关检测到的手的身份、位置和其他特征、手所附着的手臂以及与手相关联的手指列表的信息。

Hands are represented by the Hand class.手由 Hand 类表示。

Hand normal and direction vectors define the orientation of the hand手正常和方向矢量定义的手的取向

注意

More than two hands can appear in the hand list for a frame if more than one person's hands or other hand-like objects are in view. However, it is recommended to keep at most two hands in the Leap Motion Controller's field of view for optimal motion tracking quality.如果有多个人的手或其他类似手的物体在视图中，则一帧的手部列表中可能会出现两个以上的手部。但是，建议在 Leap Motion 控制器的视野中最多保留两只手，以获得最佳的运动跟踪质量。

An arm is a bone-like object that provides the orientation, length, width, and end points of an arm. When the elbow is not in view, the Leap Motion controller estimates its position based on past observations as well as typical human proportion.手臂是一个类似骨骼的对象，它提供了手臂的方向、长度、宽度和端点。当肘部不在视野中时，Leap Motion 控制器会根据过去的观察以及典型的人体比例估计其位置。

Arms are represented by the Arm class.武器由 Arm 类表示。

The Leap Motion controller provides information about each finger on a hand. If all or part of a finger is not visible, the finger characteristics are estimated based on recent observations and the anatomical model of the hand. Fingers are identified by type name, i.e. thumb, index, middle, ring, pinky.Leap Motion 控制器提供有关手上每个手指的信息。如果手指的全部或部分不可见，则基于最近的观察和手的解剖模型来估计手指特征。手指由类型名称标识，即 thumb, index, middle, ring, pinky。

Fingers are represented by the Finger class.手指由 Finger 类表示。

Finger tip position and direction provide the position of a finger tip and the general direction in which a finger is pointing指尖位置和方向提供指尖的位置和手指指向的大致方向

Each finger has a set of bones describing the position and orientation of corresponding anatomical finger bones. All fingers contain four bones ordered from base to tip.每个手指都有一组骨骼，描述相应解剖手指骨骼的位置和方向。所有手指都包含从根部到尖端排列的四根骨头。

Bones are represented by the Bone class.骨骼由 Bone 类表示。

Palm and all its finger bones手掌及其所有指骨

The bones are identified as:骨骼被识别为：

• Metacarpal — the bone inside the hand connecting the finger to the wrist (except the thumb).Metacarpal — 将手指连接到手腕（拇指除外）的手内部骨骼。
• Proximal Phalanx — the bone at the base of the finger, connected to the palm.Proximal Phalanx — 手指根部的骨骼，与手掌相连。
• Intermediate Phalanx — the middle bone of the finger, between the tip and the base.Intermediate Phalanx — 手指的中间骨骼，在尖端和基部之间。
• Distal Phalanx — the terminal bone at the end of the finger.Distal Phalanx — 手指末端的终端骨骼。

注意

Such model for the thumb does not quite match the standard anatomical naming system. A real thumb has one less bone than the other fingers. However, for ease of programming, the Leap Motion thumb model includes a zero-length metacarpal bone so that the thumb has the same number of bones at the same indexes as the other fingers. As a result the thumb's anatomical metacarpal bone is labeled as a proximal phalanx and the anatomical proximal phalanx is labeled as the intermediate phalanx in the Leap Motion finger bone model.这种拇指模型与标准解剖命名系统不太匹配。真正的拇指比其他手指少一根骨头。但是，为了便于编程，Leap Motion 拇指模型包括一个零长度的掌骨，以便拇指与其他手指在相同索引处具有相同数量的骨骼。因此，在 Leap Motion 手指骨模型中，拇指解剖学掌骨被标记为近节指骨，解剖学近节指骨被标记为中间指骨。

Along with the computed tracking data, you can get the raw sensor images from the Leap Motion cameras.连同计算出的跟踪数据，您可以从 Leap Motion 相机获取原始传感器图像。

A raw sensor image with superimposed calibration points带有叠加校准点的原始传感器图像

The image data contains the measured IR brightness values and the calibration data required to correct for the complex lens distortion. You can use the sensor images for augmented reality applications, especially when the Leap Motion hardware is mounted to a VR headset.图像数据包含测量的红外亮度值和校正复杂镜头畸变所需的校准数据。您可以将传感器图像用于增强现实应用程序，尤其是当 Leap Motion 硬件安装到 VR 耳机时。

• C++ sample illustrating the basic aspects of working with the plugin: source/samples/3rdparty/LeapMotionVisualizer说明使用插件的基本方面的 C++ 示例：source/samples/3rdparty/LeapMotionVisualizer

LeapMotion API:

• The LeapMotion interface article for more details on managing LeapMotion via API.有关通过 API 管理 LeapMotion 的更多详细信息，请参阅 LeapMotion 接口文章。
• The LeapMotion Arm class article for more details on managing arms via API.有关通过 API 管理武器的更多详细信息，请参阅 LeapMotion Arm 类文章。
• The LeapMotion Bone class article for more details on managing finger bones via API.有关通过 API 管理手指骨骼的更多详细信息，请参阅 LeapMotion Bone 类文章。
• The LeapMotion Finger class article for more details on managing fingers via API.有关通过 API 管理手指的更多详细信息，请参阅 LeapMotion Finger 类文章。
• The LeapMotion Hand class article for more details on managing hands via API.有关通过 API 管理手牌的更多详细信息，请参阅 LeapMotion Hand 类文章。