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Link to another node local variable

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How could I set a parameter as a link of another node local variable? I need to set a length of my line equal to a sphere's $YMIN. Maybe there is a better way to do it?

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You can use the expression function bbox to get measures of some bounding box. You can point the first argument to whatever other node your want

Personally, since I find myself doing this all the time, I usually put a bound qL from qlib and then I just copy the reference, it seems more organized to me. If you want all 3 measurements for whatever reason, this is specially faster 

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