本帖最后由 ValleyViews 于 2015-10-8 02:24 编辑
7 V) V& Z( w+ d% `! Daysuio 发表于 2015-10-7 04:58
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8 r7 p" g/ A g( U/ _5 s6 F大侠,别用您啦,小子真担待不起,我是小弟:D$ k9 u7 u" i6 w1 C7 L" Q* j
大侠这么认真,小子自然很愿意来跟大侠说一下。 # X7 N7 Z: p, K$ t; G/ W
四海之内皆兄弟也。 2 ^" b! |9 F P6 q
Talking about your explanation, I think that every sentence is understandable except this one: “Line elements is a 2D element, like it just has dimensions in X and Y, and NEVER think about you can measure line elements in Z axis.” My understanding is that even though you measure line elements in specified view direction ( either front view or side view ), it doesn't mean the measured line element is a 2D element. Furthermore, actually it is still a 3D element. When you measure it with an indicator, what will you get? You must get some values in Z axis.
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