3DSMAX How I can use Tape Lenght in Reaction Manager?

Hello, Im adding some bones in the skirt of a character and Im adding some extra bones to control the mesh

I added a Point Helper in the Knee and another Point where the knee should be when the legs moves foward. I Attached a Tape in both points to use that information in Reaction Manager, but when I link them the value is empty, if I activate the Specify Lenght option it works, but I want to set up to work automatic, to save time in the animation process. Tried to use Wire Parameters to send the info to another object but the results where the same, only worked when I activated the Specify Lenght

Anyone know how to use this value?

I need that information because I want to do something like this:


Or if you know a better and smarter solution than what im doing?


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