1 Nov
2010
1 Nov
'10
2:02 p.m.
The F0* codes are internal to context/luatex and are font specific (if at some point you decided to use another font, or updated version of the same font, you will be getting completely different glyphs if anything at all).
You can use glyph names which are a bit more portable:
\setupbodyfont[cambria]
\starttext \fontchar{summation} \fontchar{summation.vsize1} \fontchar{summation.vsize2} \fontchar{summation.vsize3} \fontchar{summation.vsize4} \stoptext
Many thanks! This is exactly what I was looking for... Oliver