Hi Hans,
the bad news is that transparent colors don't work at all in the latest
beta with mkiv (they worked on and off with the beta before that). The
good
news is that this makes it easier to build a minimal example :-) Here
comes:
\setupcolors[state=start]
\starttext
\startuseMPgraphic{test}
pair a, b, c, d ;
a = (0,0) ; b = (0,5cm) ; c = (5cm,5cm) ; d = (5cm,0) ;
path p ; p = a -- b -- c -- d -- cycle ;
draw a -- c withcolor black ;
fill p withcolor transparent (1,0.25,red) ;
\stopuseMPgraphic
\useMPgraphic{test}
\stoptext
All best
Thomas
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