On 08/06/2022 09:55, Ulrike Fischer wrote:
Sorry but I think it is one of the nice features of a modern tex
system that it creates tfm or pk fonts on the fly.
That's fine; we can agree to differ on such philosophical points.
xetex is doing that internally too for your open type fonts: it is
still tex and needs tfm files.
Does it ?  Are you absolutely certain ?
Do you want to miss that feature and
have to prepare the tfm files your self before using a font?
It it does, then no, I am happy for it to do that, but I was unaware that it does.
XeTeX doesn't fallback. It uses the fonts that your format and your
code tells it to use. If you prefer to use unicode math fonts, here
is a receipt what you have to change in plain for this:
https://tex.stackexchange.com/q/308749/2388

By "fall back", I meant "use Computer Modern for maths if Ihave failed to declate my own maths fonts".  But thank you for the recipe — much appreciated.

Incidentally, I now see that I can use the following successfully, which makes it far easier to integrate the desired functionality into TeXwords —

D:\ XeTeX -no-mktex=TFM \input Font-error
This is XeTeX, Version 3.141592653-2.6-0.999994 (TeX Live 2022) (preloaded format=xetex)
 restricted \write18 enabled.
entering extended mode
(./Font-error.tex [1] [2] [3] [4] [5] [6] [7] [8] [9]
! Font \fnf= not loadable: Metric (TFM) file or installed font not found.
<to be read again>
                   \font
l.441 \font \fnf  = \font
                          \fb "Gill Sans MT" scaled 455
? s
OK, entering \scrollmode...
[10] [11] [12] )
(see the transcript file for additional information)
Output written on Font-error.pdf (12 pages).
Transcript written on Font-error.log.
--
/** Phil./

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