Distance Between user and The kinect Device

Question

Hey all :)
how to get the distance between user and the kinect ??
i found a function but it's in kinect v1 
public static double GetSkeletonDistance(this Skeleton skeleton)
            return (skeleton.Position.X * skeleton.Position.X) +
                   (skeleton.Position.Y * skeleton.Position.Y) +
                   (skeleton.Position.Z * skeleton.Position.Z);
i don't know how to make it under kinect v2 ?

Answer 1

Joint head = body.Joints[JointType.hipCentre];
return head.Position.Z ;
it always return 0 :/
There is no hipCentre in Kinect v2 SDK. Have a look at
JointType Enumeration. There you can see all the available JointTypes. I am using the
SpineBase , because users may lean from time to time. So
return body.Joints[JointType.SpineBase].Position.Z;
should give you a nice distance. Keep in mind, that even the smallest changes will affect this value. So if you want to check for a distance, you might want to use a threshold or even joint accumulation.
Best regards,
Alex
Edit: Please mark Brekel's answer as answer. Thanks.