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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。