For many calculations it can be helpful if all
values are only positive. The Absolute Node automatically passes on its results as positive values
only. 对于许多计算来说,如果所有的值都是正值,那么它会很有帮助。绝对节点自动将其结果作为正值传递
Negative values within a calculation are not always desired. This Node ensures that each input value is
converted to a positive value.