正交正投影就是如此简单。
When using D3's orthographic projection I get the same problem as well.使用D3的正投影我有同样问题的时候。
In engineering drawing, it is always inconvenient for orthographic projection to solve some measurement and orientation problems.由于在工程图学中,用正投影法解决画法几何中的某些度量和定位问题往往很不方便。