greek accents with TeX Gyre Termes in lualatex and xelatex

Question

\documentclass[11pt,a4paper]{scrartcl}

\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{TeX Gyre Termes}

\begin{document}
This is English with some Greek: γέγονεν.
Isn't that quite nice? εὕρηκα!
\end{document}

Output using XeLaTeX:

This is English with some Greek: γέγονεν. Isn’t that quite nice? ε�ρηκα!

Output using LuaLaTeX:

This is English with some Greek: γγονεν. Isn’t that quite nice? ερηκα!

---

It seems that ὕ is missing in XeLaTeX (presumably because it is not part of the font), but έ is present. Both are missing in LuaLaTeX. Any suggestion about how to get LuaLaTeX to find the έ?

Answer 1

TeX Gyre Termes has very limited support for Greek. You can try the Tempora font, just included in TeX Live with today's update.

\documentclass[11pt,a4paper]{scrartcl}

\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{Tempora}

\begin{document}

This is English with some Greek: γέγονεν.

Isn't that quite nice? εὕρηκα!

\end{document}

For single words, you can just type them; for more complex phrases or complete sentences, marking up the text with polyglossia commands or environments is highly recommended.

Update

As of today's (2015-10-01) update, Tempora seems to behave also with LuaLaTeX

\documentclass[11pt,a4paper]{scrartcl}

\usepackage{fontspec}
\usepackage{polyglossia}

\setmainlanguage{english}
\setotherlanguage[variant=ancient]{greek}

\setmainfont{Tempora}
%\newfontfamily\greekfont[Script=Greek]{Tempora}

\begin{document}
This is English with some Greek: \textgreek{γέγονεν}.

Also without \verb|\textgreek|: γέγονεν

Isn't that quite nice? \textgreek{εὕρηκα}!

\end{document}

Answer 2

As Sverre says, the basic problem here is that the font does not support Greek. Moreover, you are not loading any package to actually deal with multilingual typesetting i.e. either Babel or Polyglossia.

For example, the following works for LuaLaTeX:

\documentclass[11pt,a4paper]{scrartcl}
\usepackage{polyglossia}
\setmainlanguage[variant=british]{english}
\setotherlanguage{greek}
\usepackage{fontspec}
\setmainfont{GFS Artemisia}[Ligatures=TeX]
\newfontfamily\greekfont{GFS Artemisia}[Ligatures=TeX,Script=Greek]

\begin{document}
  This is English with some Greek: \textgreek{γέγονεν}.
Isn't that quite nice? εὕρηκα!
\end{document}

The GFS fonts all provide Greek since they are from the Greek Font Society. However, the above example does not work correctly in XeLaTeX.

In contrast, GFS Bodoni works with either XeLaTeX or LuaLaTeX:

\documentclass[11pt,a4paper]{scrartcl}
\usepackage{polyglossia}
\setmainlanguage[variant=british]{english}
\setotherlanguage{greek}
\usepackage{fontspec}
\setmainfont{GFS Bodoni}[Ligatures=TeX]
\newfontfamily\greekfont{GFS Bodoni}[Ligatures=TeX,Script=Greek]

\begin{document}
  This is English with some Greek: \textgreek{γέγονεν}.
Isn't that quite nice? εὕρηκα!
\end{document}

You could, of course, still use TeX Gyre Termes as the main font for Latin scripts, but then you need to think about selecting a complementary font for Greek. So if you can find a font you like which supports both Latin and Greek scripts, life is probably easier.

I thought that XITS would make a good alternative to Termes since they are both Times clones. Unfortunately, though, XITS does not give the correct output for either XeLaTeX or LuaLaTeX, so it seems not a good choice, even though it claims to support Greek.

Answer 3

The font TeX Gyre Termes doesn't have the Greek character U+03AD"GREEK SMALL LETTER EPSILON WITH TONOS".

If you want to, you can fake it by adding U+0301 "COMBINING ACUTE ACCENT":

\documentclass{article}
\usepackage{fontspec}
\setmainfont{TeX Gyre Termes}
\begin{document}
This is English with some Greek: γε\char"0301γονεν.
\end{document}

Produces:

The accent doesn't look quite right, but that's because the font also doesn't have U+0384 "GREEK TONOS" which you would normally use for Greek. As you can understand, you simply shouldn't use TeX Gyre Termes for Greek. You should pick another font.