[luatex] Correct use of \overwithdelims?

Will Robertson wspr81 at gmail.com
Thu Jul 15 08:26:18 CEST 2010


We're in territory in which I'm a little unfamiliar, so please excuse 
the questions. What is the correct way to use \overwithdelims with 

In Plain and XeTeX, the brackets enlarge satisfactorily (see attached 
example), based on (so I read) fontdimens 20 & 21. In LuaTeX with both 
Cambria and XITS, the brackets remain small.

Am I doing it wrong?


    \font\test="Cambria Math:script=math" at 10pt
  \input luaotfload.sty
  \font\test={name:Cambria Math:mode=base;script=math} at 10pt

\def\1{{\displaystyle x\over \displaystyle y}}
\def\2{{\displaystyle a\over \displaystyle b}}

\left( {x\over y} \right)
\left( \1\over\2 \right)
\left( \3\over\3 \right)
{x\overwithdelims() y}
{\1 \overwithdelims() \2}
{\3 \overwithdelims() \3}


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