骨骼的XYZ坐标的本质是什么?

我正在开发一个带有kinect设备的手势应用程序。这里我用X,y,z坐标检查手势

我想知道一个特定手势的骨架的性质。我在检查这个手势是不是手推。

private handpush()
{
 bool MovedFront = false;
 float refDistance = 0.2F;

 SkeletonPoint refPos = SkeletonHistory[0].Joints[JointType.ShoulderCenter].Position;
 SkeletonPoint startPos = SkeletonHistory[0].Joints[JointType.HandRight].Position;
 //printing all intial cordinates
 Console.WriteLine(" ShoulderCenter[0].Z = " + refPos.Z);
 Console.WriteLine(" HandRight[0].X = " + startPos.X);
 Console.WriteLine(" HandRight[0].Y = " + startPos.Y);
 Console.WriteLine(" HandRight[0].Z = " + startPos.Z);

   for (int i = 20; i < SkeletonHistory.Count; i++)
   {
            Console.WriteLine(" ShoulderCenter[i].Z = " + SkeletonHistory[i].Joints[JointType.ShoulderCenter].Position.Z);
            Console.WriteLine(" HandRight[i].X = " + SkeletonHistory[i].Joints[JointType.HandRight].Position.X);
            Console.WriteLine(" HandRight[i].Y = " + SkeletonHistory[i].Joints[JointType.HandRight].Position.Y);
            Console.WriteLine(" HandRight[i].Z = " + SkeletonHistory[i].Joints[JointType.HandRight].Position.Z);

            if (!(SkeletonHistory[i].Joints[JointType.HandRight].Position.Y < SkeletonHistory[i].Joints[JointType.Head].Position.Y &&
                    Math.Abs(SkeletonHistory[i].Joints[JointType.ShoulderCenter].Position.Z - refPos.Z) < 0.05F &&
                    Math.Abs(SkeletonHistory[i].Joints[JointType.HandRight].Position.Y - startPos.Y) < 0.1F &&
                    Math.Abs(SkeletonHistory[i].Joints[JointType.HandRight].Position.X - startPos.X) < 0.1F))
            {
                Console.WriteLine("CheckHandPush breaking !!");
                break;
            }
            if (SkeletonHistory[i].Joints[JointType.HandRight].Position.Z <= (startPos.Z - refDistance))
            {
                Console.WriteLine("CheckHandPush sucess");
                bMovedFront = true;
                temp_SkeletonHistory.Clear();
            }
    }
   return MovedFront;
}

但我得到的初始值如下:

ShoulderCenter[0].Z = 1.246491
 HandRight[0].X = 0.1519185
 HandRight[0].Y = -0.2328865
 HandRight[0].Z = 1.014945
 ShoulderCenter[i].Z = 1.248788
 HandRight[i].X = 0.1397971
 HandRight[i].Y = -0.2452036
 HandRight[i].Z = 1.054223
 -----
 ShoulderCenter[0].Z = 1.26865
 HandRight[0].X = 0.1545139
 HandRight[0].Y = -0.3375102
 HandRight[0].Z = 1.057466
 ShoulderCenter[i].Z = 1.25049
 HandRight[i].X = 0.09602752
 HandRight[i].Y = -0.283217
 HandRight[i].Z = 1.150237

 ---
 ShoulderCenter[0].Z = 1.243356
 HandRight[0].X = 0.1406149
 HandRight[0].Y = -0.2458241
 HandRight[0].Z = 1.065399
 ShoulderCenter[i].Z = 1.250542
 HandRight[i].X = 0.1392216
 HandRight[i].Y = -0.2418006
 HandRight[i].Z = 1.046706

我在推我的手，所以Z轴应该增加还是减少这个值?表示Z坐标长度是从kinect设备还是人体开始的?

这个条件可以用手推吗?有什么建议吗?我可以得到一个示例代码吗??

任何有用的链接x,y,z坐标检查手推，手拉?

我对坐标检查感到困惑。