Still trying to have different blackboard symbols than those default with
"modern", but also to learn more about fonts, I've found these two examples
that I've been trying to adapt to math (
http://tex.stackexchange.com/questions/124824/context-unicode-fallback-font),
one involving \definefontfallback, the other one using \setmainfontfallback
with some "range".

It is very interesting because in both cases I completely fail to obtain
the result I want.
In the first case I do have the symbols from termes, but only some "N"
instead of \char0x2115.
In the second case (simplefonts), all symbols follow the required fallback,
but the math characters.



\definefontfallback
  [termes_fallback]
  [termes] [0x0000-0xFFFF] %%[force=no]

\Umathquad\displaystyle=1em
\Umathaxis\textstyle=.8ex

\starttypescript [myModern]
    \definetypeface [myModern] [rm] [serif] [modern]     [default]
    \definetypeface [myModern] [ss] [sans]  [modern]  [default]
[rscale=0.887]
    \definetypeface [myModern] [tt] [mono]  [modern]    [default]
[rscale=1.163]
    \definetypeface [myModern] [mm] [math]  [termes_fallback]     [default]
[rscale=1.050]
\stoptypescript

\usetypescript[myModern]
\setupbodyfont[myModern,12pt]

\starttext

The default one doesn't even seem to have $ℕ \char"2115 \Umathchar "0
"0 "2115\alpha$\char"2115,  α (alpha).


\usemodule[simplefonts]
\setmainfontfallback[termes][range={0x0000-0xFFFF}, force=yes,
  rscale=auto]

The default one doesn't even seem to have
$\Umathchar"0"0"2115\utfchar{"2115}$ (white circle) or α (alpha).

\stoptext



Some help with those examples would be very helpful.

Regards,
Chris





On Thu, Dec 19, 2013 at 4:50 PM, Elspeth McGullicuddy <
elspethmcgullicuddy@gmail.com> wrote:

> Hi,
> I'm writing math and I'm using "modern", and I would like to use
> "doublestroke".
> There is an example here,
> http://www.ntg.nl/pipermail/ntg-context/2008/037124.html, but I think
> it's not likely to work since families aren't used anymore.
> I really can't think how it should be done, and all I've found would be
> through some substitution mechanism as described in "fonts-mkiv.pdf".
> I could use an example of replacing a "vector" of a font, by another font.
> There might be things too with "simplefonts" and "fallback" mechanism, but
> I haven't seen examples with math.
> Regards,
> Chris
>
>