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如何实现一个人走近体感摄像头，物体变大，远离体感摄像头，物体变小呢？？如果做出这样的控制，那么就会比用手势来缩放物体更能体现科技含量。
相信很多人有很多的做法，我就用最简单的方式，深度数据。 在这里说几句题外话，体感的精髓并不是彩色数据流，而是深度数据流，这里面包含了太多你有用的东西。

好了，思路如下：
首先定义两个变量，一个是 记录上一次的 人身体的深度数据Z 轴值， 然后每一帧都用新获取的人身体的Z轴深度数据值与老的比较，如果小于0 那就是靠近了，如果大于0，那就远离。
这只是简单思路，如果要是做的平滑的缩放物体，还要做些优化。
代码如下：
using UnityEngine;
using System.Collections;
//using Windows.Kinect;
public class JointOverlayer : MonoBehaviour
{
[Tooltip(“GUI-texture used to display the color camera feed on the scene background.”)]
public GUITexture backgroundImage;
[Tooltip(“Camera that will be used to overlay the 3D-objects over the background.”)]
public Camera foregroundCamera;

    [Tooltip("Index of the player, tracked by this component. 0 means the 1st player, 1 - the 2nd one, 2 - the 3rd one, etc.")]    public int playerIndex = 0;    [Tooltip("Kinect joint that is going to be overlayed.")]    public KinectInterop.JointType trackedJoint = KinectInterop.JointType.Head;    [Tooltip("Game object used to overlay the joint.")]    public Transform overlayObject;    //public float smoothFactor = 10f;    //public GUIText debugText;    private Quaternion initialRotation = Quaternion.identity;private Vector3 oldeDepth;private Vector3 newDepth;    void Start()    {           if(overlayObject)           {                   // always mirrored                   initialRotation = Quaternion.Euler(new Vector3(0f, 180f, 0f));                   overlayObject.rotation = Quaternion.identity;           }    }    void Update ()    {           KinectManager manager = KinectManager.Instance;           if(manager && manager.IsInitialized() && foregroundCamera)           {                   //backgroundImage.renderer.material.mainTexture = manager.GetUsersClrTex();                   if(backgroundImage && (backgroundImage.texture == null))                   {                          backgroundImage.texture = manager.GetUsersClrTex();                   }                   // get the background rectangle (use the portrait background, if available)                   Rect backgroundRect = foregroundCamera.pixelRect;                   PortraitBackground portraitBack = PortraitBackground.Instance;                   if(portraitBack && portraitBack.enabled)                   {                          backgroundRect = portraitBack.GetBackgroundRect();                   }                   // overlay the joint                   int iJointIndex = (int)trackedJoint;                   if(manager.IsUserDetected())                   {                          long userId = manager.GetUserIdByIndex(playerIndex);                          if(manager.IsJointTracked(userId, iJointIndex))                          {                                  Vector3 posJoint = manager.GetJointPosColorOverlay(userId, iJointIndex, foregroundCamera, backgroundRect);                newDepth = posJoint;                //Debug.Log(newDepth.z - oldeDepth.z);                //if(newDepth.z-oldeDepth.z<-0.1f)                //{                //    Debug.Log("near");                //}                //else if(newDepth.z - oldeDepth.z > 0.1f)                //{                //    Debug.Log("far");                //}                //else                //{                //    //Debug.Log("stay");                //}                float offset = newDepth.z - oldeDepth.z;                float scaleFactor = offset / 10f;                Vector3 localScale = transform.localScale;                Vector3 scale = new Vector3(localScale.x + scaleFactor,                                            localScale.y + scaleFactor,                                            localScale.z + scaleFactor);                overlayObject.localScale = scale;                oldeDepth = newDepth;                //Debug.Log(posJoint.z);                if (posJoint != Vector3.zero)                                  {                                                                              if(overlayObject)                                         {                                                 overlayObject.position = posJoint;                                                 Quaternion rotJoint = manager.GetJointOrientation(userId, iJointIndex, false);                                                 rotJoint = initialRotation * rotJoint;                                                 overlayObject.rotation = rotJoint;                                         }                                  }                          }                                  }           }    }

}

这个代码是在 kinect 2.0 的小球跟着你的手移动的基础上修改的。 在做物体的缩放优化 这块，我借鉴了 Touch 用两个手指缩放物体的代码。 不得不说， 其实算法都是相同的。ok 就写到这里。