关于 DX 9 龙书的更换为 DX 11/12

I have read books on DX 9 and DX 12 (I don't think there is much difference between DX 11 and DX 12). Although DX 9 can be considered as an entry-level graphics programming, the difference between DX 9 and DX 12 is too great now. Basically, after reading DX 9, reading DX 12 is like learning all the APIs again (of course, the basic concepts are the same, such as planar mirrors, planar shadows, lighting models, etc.). Another important point is the Raytracing technology, which I believe will become more and more important in the future. So I personally recommend that it is better to start with DX 11 or DX 12.