[R] selecting points on 3D scatterplots

[Duncan Murdoch]

On 5/12/2009 3:08 PM, Abby Drake wrote:
> Hello Everyone,
> 
> I am new to R and need some help.
> 
> I have a matrix of x,y,z coordinates that I would like to
> interactively plot in 3D and then using the cursor select points on
> the plot and have the coordinates sent to a matrix. I am using the rgl
> package to plot the data at the moment because it allows me to rotate
> and zoom. I also tried cloud and scatterplot3D.
> 
> I am looking for a function like 'locator' which is used to select
> points on 2D scatterplots.

There's no locator3d, but select3d is somewhat similar.

You could write a locator3d function using the rgl.setMouseCallbacks, 
rgl.user2window and rgl.window2user functions, if you can figure out how 
to indicate depth with a mouse click.  identify3d might be a little easier.

Duncan Murdoch