Hi Marco,

there is a differenece between the family name of a font (which is used 
by \definefontfamily) and the individual name of a font. The differences 
between both names can be explained with a with a (kind of) real family.

For my example I use the main cast of the Simpsons.


Surname : Simpson

     Grandfather : Abraham Simpson
     Grandmother : Mona Simpson
     Father      : Homer Simpson
     Mother      : Marge Simpson
     Son         : Bart Simpson
     Daughter    : Lisa Simpson


All members of the family use the same surname but each of them has also 
its individual name, the same system can be applied to your font collection.


Family: Caecilia LT Std

     Light       : Caecilia LT Std Light
     Lightitalic : Caecilia LT Std Light Italic
     Regular     : Caecilia LT Std Roman
     Italic      : Caecilia LT Std Italic
     Bold        : Caecilia LT Std Bold
     Bolditalic  : Caecilia LT Std Bold Italic
     Heavy       : Caecilia LT Std Heavy
     Heavyitalic : Caecilia LT Std Heavy Italic


Each font of your collection has its individual name, e.g. the regular 
style has the name “Caecilia LT Std Roman” but all styles use the same 
name for the family (i.e. “Caecilia LT Std”) which is used by 
\definefontfamily.


When you now used a individual name instead of the family name for 
\definefontfamily you should get a message in log for the correct name, 
e.g. the following example

     \definefontfamily[mainface][rm][TeX Gyre Pagella Regular]

     \setupbodyfont[mainface]

     \starttext
     Font test!
     \stoptext

shows this in the log

     selectfont > The name 'texgyrepagellaregular' is not a proper 
family name, use 'texgyrepagella' instead.
     selectfont > The requested font 'TeX Gyre Pagella Regular' has no 
files for the 'tf' alternative, Latin Modern is used instead.

which tells you to use “texgyrepagella” for the \definefontfamily command.


Wolfgang
> Marco Patzer <mailto:lists@homerow.info>
> 9. März 2017 um 10:33via Postbox 
> <https://www.postbox-inc.com/?utm_source=email&utm_medium=sumlink&utm_campaign=reach>
> Hi!
>
> I run into a problem using some fonts. Latin Modern is used instead
> and ConTeXt displays:
>
> selectfont > The requested font 'Caecilia LT Std Roman' has no files 
> for the 'tf' alternative, Latin Modern is used instead.
>
> Example:
>
> \definefontfamily
> [mainface]
> [rm]
> [Caecilia LT Std Roman]
> %% doesn't work, either
> %% [tf=file:CaeciliaLTStd-Roman.otf]
>
> \setupbodyfont [mainface]
>
> \starttext
> %% \definedfont [name:CaeciliaLTStd-Roman] %% this works
> \input knuth
> \stoptext
>
> The font is in the database:
>
> mtxrun -script fonts -list -all caecilia
>
> This happens with other fonts too, not only Caecilia. Some fonts
> work, others don't. Couldn't find anything on the list, so I might
> be doing something wrong here. What's the issue here?
>
> context: 2017.03.02 22:23
>
> Marco
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