LuaTeX vs XeTeX

[Herbert Voss]

Am 17.12.21 um 20:20 schrieb Virgil Arrington:
>
> *From: *Herbert Voss via lyx-users <mailto:lyx-users at lists.lyx.org>
> *Sent: *Friday, December 17, 2021 6:06 AM
> *To: *lyx-users at lists.lyx.org
> *Subject: *Re: LuaTeX vs XeTeX
>
> Am 16.12.21 um 22:12 schrieb Virgil Arrington via lyx-users:
> > > Starting with the completely clean files, I added the Microtype
> > > package to both and compiled them. As with my first test, I got
> > > different results. XeTeX once again produced many more hyphenated
> > > lines -- essentially the same as it produced without Microtype -- 
> than
> > > did LuaTeX. Neither produced any significant overfull lines at the
> > > right margin.
> > >
> > > So, it seems as if Microtype behaves differently with XeTeX and 
> LuaTeX
> > > -- at least on my system.
> > >
>
> > Sure, microtype for xetex is not the same as microtype for luatex.
>
> So, I’ve learned a lot in the last couple days. Let’s see if I have 
> this right.
>
> 1. PDFLaTeX creates documents using fonts supplied in the TeX 
> distribution.
>
> 2. XeTeX creates documents using fonts supplied by the Operating System.
>

also the ones from the TeX distribution if defined by the font's filename.
Then kpsewhich can find the font.


> 3. LuaTeX can create documents using fonts from either the TeX 
> distribution OR the OS system.
>

luatex defines an own font database which also has the symbolic names of 
the fonts saved.
.../texmf-var/luatex-cache/generic/names/luaotfload-names.lua.gz


Herbert



> If I am right about #3, then I more fully understand Herbert’s 
> original assertion that, with LuaTeX, there’s no reason to resort to 
> PDF(La)TeX (or XeTeX for that matter).
>
> Virgil
>
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