---
\usetypescript[cambria]
\setupbodyfont[cambria]
\def\defaultrulethickness{\the\fontdimen8\textfont3\relax}
\starttext
\the\defaultrulethickness
\stoptext
---
which used to work in the old MkII days.
That is with the first two lines commented out :-)
I was finally able to come up with this:
---
\usetypescript[cambria]
\setupbodyfont[cambria]
\starttext
FractionRuleThickness (in display style): \the\Umathfractionrule\displaystyle
FractionRuleThickness (in script style): \the\Umathfractionrule\scriptstyle
etc.
\stoptext
---
This should work with any font in MkIV. More parameters can be found in the
LuaTeX manual at
http://www.luatex.org/svn/trunk/manual/luatexref-t.pdf
in section 5.4 on pages 114f. (Boy, did it take me time to discover this!
Seriously.)
Oliver
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