the metafun code from context has evolved and now (since Texlive 2016) uses functions (in the example fillup) that are not supported by luamplib for pdf output. This has e.g. the effect that arrow tips are not filled:
i have added some code to the luatex-mplib.lua module and it works in
plain now so when i post a new context beta someone has to make sure
it's also used in latex
the metafun code from context has evolved and now (since Texlive 2016) uses functions (in the example
fillup
) that are not supported by luamplib for pdf output. This has e.g. the effect that arrow tips are not filled:https://tex.stackexchange.com/questions/408215/metafun-why-is-the-arrow-tip-not-filled
The problem has been reported by Franck Pastor on the metapost list http://tug.org/pipermail/metapost/2017-December/003256.html and Hans Hagen wrote as answer