Am 22.12.2013 um 14:12 schrieb Elspeth McGullicuddy
First of all, thanks for this quick reply. Now what if as in the example I put, I want to mix, in math mode, some range of "modern" with some range of "termes", which are both otf fonts. Say modern is the default, but the character whose codepoint is 0x2115 (ℕ), is provided by "termes"? This mechanism could be adapted to any glyph one doesn't like the shape, e.g. substitute thin shaft arrows of modern with thicker shaft arrows of xits.
Hans extended the fallback mechanism a while ago to use it also with math fonts. With the new simplefonts code you have now a high level interface when you use a opentype math font. \definefontfamily [mainface] [rm] [Latin Modern Roman] \definefallbackfamily [mainface] [mm] [TeX Gyre Termes Math] [range=uppercasedoublestruck] \definefontfamily [mainface] [mm] [Latin Modern Math] \setupbodyfont[mainface] \starttext \startformula ABC \quad {\blackboard ABC} \stopformula \stoptext Wolfgang