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Cnfsub direction vectors

Hello,
 
In the Adams online help for Cnfsub, it is stated that the ni, nj variables are the direction vector arrays for the normal contact force. However when viewing their contents, they seem to contain only a single value. How is the contact normal force calculated in Adams? Is the default contact algorithm called seperately for the x, y, z directions or is there a single call, where the force is caclulated and then broken down to its xyz components?
 
Thanks,
 
Josef K.