There is a newer option (rel. 96.1) for a more general automatic sorting that attempts to sort points in order to
generate a reasonable curve from the given point set. This sorting is requested by option ** at the start of the
projection record.
“double asterisk in front of the curve‘s yz definition signifies that the curve’s points are sorted according to the shortest distance between the points. As this default definition can sometimes cause problems, we remove the asterisks. ”
我的理解就是说 曲线的点被根据点之间的最短距离来分类 鉴于这个默认的定义可能有时会导致问题 我们去掉这些星号
不过实际使用的时候我没这样用过 还有manual上的case也是一开始写了double asterisk 但是后面调整曲线定义 最后并没有真正意义上使用