This question already has an answer here:
In XeTeX, I can set up a font pretty straightforwardly with:
\font\foo="Minion Pro" at 10pt
I don't quite see how to do it. This question suggests that the answer is "use luaotfload.sty." Is that true or is there something comparable to the above I can do directly in LuaTeX? Or is there some other, better plain-ish TeX way of loading fonts (by which I mean system fonts in TTF or OTF format) from LuaTeX?
Looking at the LuaTeX manual, I see some Lua code. If that's the right way to do it from LuaTeX directly, which functions do I need to use to do this?