Hi Mikael, math fonts are a bit different from text fonts. This means that you need special methods to influence them. Because I once had a similar concern like you I asked Hans to implement a way to influence kerning in math fonts between certain glyphs. I have attached an lfg-file that shows how to use it.
To enable a goodie file like the one attached you have to define your
typescript like
\starttypescript [\s!math][cambriaown][\s!all]
\loadfontgoodies[cambriaown-math]
\definefontsynonym[\s!MathRoman] [Cambria-Math]
[\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!goodies=cambriaown-math]
\stoptypescript
I hope this helps!
Best
Mathias
cambriaown-math.lfg
Description: Binary data
> Am 02.06.2017 um 10:59 schrieb Mikael P. Sundqvist <mic...@gmail.com>:
>
> Hi!
>
> Now that the bug with primes is fixed in ConTeXt, I wonder if there is
> a way to change the kerning between certain characters in mathematics
> (in case one is not happy with the output from the font)? After
> reading in fonts-mkiv.pdf this is what I came up with:
>
> \startluacode
> fonts.handlers.otf.addfeature {
> name = "kerntest",
> type = "kern",
> data = {
> [0x61] = { [0x62] = -150 }, -- a and b in text
> [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b
> [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis
> }
> }
> \stopluacode
>
> \definefontfeature[kerntest][kerntest=yes]
>
> \definefontfamily[lucidaopentype][rm][Lucida Bright OT]
> \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]
>
> \setupbodyfont[lucidaopentype,10pt]
>
>
> \startTEXpage[offset=3pt]
> abba $abba f'(x)$
>
> \addff{kerntest}
>
> abba $abba f'(x)$
>
> I prefer $f'\mkern-3mu(x)$
> \stopTEXpage
>
> The output is attached as a png file. As you see the kerning works as
> expected in text mode, but not at all in math mode, even not for the a
> and b (which I hope I entered correctly).
>
> Something like the third line is what I'm after, but not having to use
> \mkern in all places. Is it possible?
>
> /Mikael
>
> PS: This is a cross post of the question
> https://tex.stackexchange.com/q/372857/52406, where I got the
> suggestion to ask on the list.
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