Things not yet mentioned:

* Some small but very useful User Interface improvements (real improvements, not just cosmetic tinkering).

* The Figure Hierarchy Window is now much easier to use.

* A small improvement to real-time Comic Book. Fewer tiny gaps in line-art, as far as I can see.

* The old automatic Poser to Anime Studio / Manga Studio script may not work. Important if you're taking figures to Clip Studio.

* Walk Designer is apparently improved. Haven't tried it.

* The Materials Room displays textures faster. May be useful if you do a lot of re-texturing.

* Support for the latest FBX export. Possibly also supports import of the latest too, at a guess?

* Complete P12 manual, done and finished. Nice.

* No easy DSON import of DAZ Genesis 1 & 2. Poser 11 still needed for DSON import.

* Still runs back to Windows 7. 

* Still exports to Vue.

* Python 3 expands the range of what Python can do. The scripts niggle is now mostly settled for most users, now there are replacements or fixes. For a comprehensive listing of free Python 3 and still-compatible Python 2 scripts for Poser 12, see here: https://jurn.link/dazposer/index.php/p12/

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Learn the Secrets of Poser 11 and Line-art Filters.