I have a ternary plot that I'm generating like this:
library(vcd)
ternaryplot(abs(replicate(3, rnorm(50))), grid=FALSE)
I don't like the built-in grid so I disabled it, but I want to draw some lines of my own: specifically I want to draw a line from each point of my triangle to the midpoint of the opposite face (i.e. three lines bisecting my triangle and crossing at the center) and I can't quite figure out how to do this. I tried abline() but nothing seems to happen when I do.
How can I draw lines on this plot?