rgl (version 0.66)

select3d: Select a rectangle in an RGL scene

Description

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

Usage

select3d()

Value

• Returns 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.

Details

This function 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.

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

See Also

locator

Examples

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

if (interactive()) {
 x <- rnorm(1000)
 y <- rnorm(1000)
 z <- rnorm(1000)
 rgl.open()
 points3d(x,y,z,size=2)
 f <- select3d()
 keep <- f(x,y,z)
 rgl.pop()
 points3d(x[keep],y[keep],z[keep],size=2,color='red')
 points3d(x[!keep],y[!keep],z[!keep],size=2)
}