庄茁老师的<<ABA>>书中电路板跌落例子出现问题

xiaoxiaolvzi

总是出现下面的错误The rigid bodies with the reference nodes contained in node set ErrNodeRefNodeNoMass have no mass associated with them and some degrees of freedom of the reference node are not restrained. Either mass must be defined or all of the translational degrees of freedom must be constrained

yangxunfeng1024

必须要约束刚形体参考点的所有自由度呀，不然刚形体不乱串呀~约束REF所有自由度试试