这个问题我觉得有必要顶上来 继续探讨一下
documentation里面有一段话 For example, CFN is the total force acting on slave nodes due to contact pressure. CFN and other whole surface variables for general contact are typically of little utility, because contributions to the variable from different interactions within general contact will often cancel one another and the net result will typically depend on internal assignments of master and slave roles.
那么既然用处很小,为什么设置这个CFN输出呢?