Joint speed and confidence is not working

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Joint speed and confidence is not working

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Hello, I'm trying to get the joint speed and confidence from PXCHandData::JointData.

I tried to get joint data from this function.
hand->QueryTrackedJoint((PXCHandData::JointType)j, jointData)

Then, I defined the instance as follows:
double speedx = jointData.speed.x;
double speedy = jointData.speed.y;
double speedz = jointData.speed.z;
double conf = jointData.confidence;

But I always get speed value is 0.0 and confidence is 100.
Could you tell me the reason?

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