infolytica magnet 7.4 solution中的 userfield 和 getforceonbody
问题一：Solution::getForceOnBody
Description
Returns the force for the specified body. For transient solutions, the value returned is the instantaneous force.
Syntax
getForceOnBody (solution ID, body ID or path, force x, force y, force z)
body id or path 怎么获得？
问题二：
Solution::getUserField
Description
Returns a new empty field based on the given mesh, name, type, order, and default value (optional).
Note The field name must be unique and cannot be a system field name.
Syntax
getUserField(Mesh, name, type, order, DefaultValue)
userfield 究竟怎么建立？ 比如我要求▽（丨B丨 smoothed） 这样的场量 该怎么做？
谢谢各位大侠帮忙
看一下。。。。。。。
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