This function allows the user to use the mouse to select a region in an RGL scene.

select3d(button = c("left", "middle", "right"),
             dev = cur3d(), subscene = currentSubscene3d(dev))
selectionFunction3d(proj, region = proj$region)



Which button to use for selection.

dev, subscene

The RGL device and subscene to work with


An object returned from rgl.projection containing details of the current projection.


Corners of a rectangular region in the display.


select3d selects 3-dimensional regions by allowing the user to use a mouse to draw a rectangle showing the projection of the region onto the screen. It returns a function which tests points for inclusion in the selected region.

selectionFunction3d constructs such a test function given coordinates and current transformation matrices.

If the scene is later moved or rotated, the selected region will remain the same, though no longer corresponding to a rectangle on the screen.


These return a function f(x, y, z) which tests whether each of the points (x, y, z) is in the selected region, returning a logical vector. This function accepts input in a wide variety of formats as it uses xyz.coords

to interpret its parameters.


Ming Chen / Duncan Murdoch


# Allow the user to select some points, and then redraw them
# in a different color

if (interactive() && !in_pkgdown_example()) {
 x <- rnorm(1000)
 y <- rnorm(1000)
 z <- rnorm(1000)
 points3d(x, y, z)
 f <- select3d()
 if (!is.null(f)) {
   keep <- f(x, y, z)
   points3d(x[keep], y[keep], z[keep], color = 'red')
   points3d(x[!keep], y[!keep], z[!keep])