Add a 2D plot or a legend in the background of an RGL window.

bgplot3d(expression, bg.color = getr3dDefaults("bg", "color"),
magnify = 1, ...)
legend3d(...)

## Arguments

expression

Any plotting commands to produce a plot.

bg.color

The color to use for the background.

magnify

Multiplicative factor to apply to size of window when producing background plot.

...

For legend3d, arguments to pass to bgplot3d or legend; for bgplot3d, arguments to pass to bg3d.

## Details

The bgplot3d function opens a png device and executes expression, producing a plot there. This plot is then used as a bitmap background for the current RGL subscene.

The legend3d function draws a standard 2D legend to the background of the current subscene by calling bgplot3d to open a device, and setting up a plot region there to fill the whole display.

## Value

The bgplot3d function invisibly returns the ID of the background object that was created, with attribute "value" holding the value returned when the expression was evaluated.

The legend3d function does similarly. The "value" attribute is the result of the call to legend. The scaling of the coordinates runs from 0 to 1 in X and Y.

Duncan Murdoch

## Note

Because the background plots are drawn as bitmaps, they do not resize very gracefully. It's best to size your window first, then draw the background at that size.

bg3d for other background options.

## Examples

x <- rnorm(100)
y <- rnorm(100)
z <- rnorm(100)
open3d()
# Needs to be a bigger window than the default
par3d(windowRect = c(100, 100, 612, 612))
parent <- currentSubscene3d()
mfrow3d(2, 2)
plot3d(x, y, z)
next3d(reuse = FALSE)
bgplot3d(plot(y, z))
next3d(reuse = FALSE)
bgplot3d(plot(x, z))
next3d(reuse = FALSE)
legend3d("center", c("2D Points", "3D Points"), pch = c(1, 16))