[XeTeX] load math font ttc xetex

[Pierre Dupond]

Hi All,
      I would load the cambria math from the
file Cambria.ttc with XeLaTeX.

By looking in the documentation of the fontspec package, I have found
that indexes should be used.

\setmainfont{Optima.ttc}[
Path = /System/Library/Fonts/ ,
UprightFeatures = {FontIndex=0},
BoldFeatures = {FontIndex=1},
ItalicFeatures = {FontIndex=2},
BoldItalicFeatures = {FontIndex=3}
]

I have seen nothing similar for the command \setmathfont.
If it is possible
to load a math font from a ttc file what should be the label before
the equal sign (MathFont?).

Usually, I use Cambria Math by using the font name instead
of the file but sometimes it is more convenient to
use directly the font file on the disk.

best regards,

--
Pierre Dupond <76nemo76 at gmx.ch>