ternary plot of ggtern not working in shiny

Question

I want to use the output of ggtern() in a shiny app. However it seems to fail due to some constraints.

This is what it should look like:

This is the actual shiny output:

See here for a reproducible example:

library(shiny)
library(ggtern)

ui <- fluidPage(
        mainPanel(
           plotOutput("ggtern")
        )
)
server <- function(input, output) {
    output$ggtern <- renderPlot({
        ggtern(data.frame(x=10, y=30, z=60), aes(x, y, z)) + geom_point()
    })
}
shinyApp(ui = ui, server = server)

Do I overlook something?

Answer 1

place the plot function within a print command:

 output$ggtern <- renderPlot({
        print(ggtern(data.frame(x=10, y=30, z=60), aes(x, y, z)) + geom_point())
    })