Suggestion that add an option of vertical 3D letter direction.

[tkbd]

dgud,Thank you for reply.
OK,I would leave some the information and memo of prepare for the future.
(I don't know if it's directly useful )

Noto font : It is good sample for Asian font testing.
This high quality font has 7 weights(Black to Thin) as the font families.
The font lisense is OFL.

https://www.google.com/get/noto/
This full size are very huge,But it can get a font file to choose partially(Small size).
(For example, asian language collections is a following ,it comprehensively cover Simplified Chinese, Traditional Chinese, Japanese, and Korean)

Download URL is here
OTF format , https://github.com/googlefonts/noto-cjk/...bsetOTF/JP
TTC format , https://github.com/googlefonts/noto-cjk/...n/Sans/OTC

Approaching ideas
A) Calcurate to translate or rotation with vertical direction the coordinates for generate the next glyph.
(Pros: simple implimentation , Cons: Wrong Typograpy can occur depending on the some characters used. Some fixes nessasary.)
B) Re-refercence to dedecated glyphs codepoint for vertical writing ( Cons: Not all fonts have this feature.Also, the user wants vertical writing for other characters.)
C) Use @font name (Cons:This feature is Windows OS only)


Test string: 【グラデーション。、〜】12A１２Ａ
—―〰‥…、。〈〉《》「」『』【】〔〕〖〗〘〙〚〛〝〟（）［］｛｝～
ぁぃぅぇぉっゃゅょゎゕゖァィゥェォッャュョヮヵヶー

Also I found some information and discussions for vertical text.
https://forum.affinity.serif.com/index.p...ical-text/
https://forum.affinity.serif.com/index.p...ent=674755
https://www.oreilly.com/library/view/cjk...596156114/
https://unicode.org/notes/tn22/RobustVerticalLayout.pdf
https://docs.microsoft.com/en-us/typogra...type/spec/
https://www.iwatafont.co.jp/news/img/about_font.pdf
https://www.dynacw.co.jp/fontstory/fonts...?s=86&r=32
https://adobe-type-tools.github.io/font-...torial.pdf
https://w3c.github.io/jlreq/#characters_...omposition