[R] drawing a specific "plane" with scatterplot3d

[Duncan Murdoch]

On 12-07-31 2:54 PM, Andras Farkas wrote:
> Dear All,
>
> using the example from the package scatterplot3d I created a 3d plot as follows:
>
> x <-rnorm(500,50,2)
> y <-rnorm(500,5,1)
> z <-rnorm(500,6,1)
> scatterplot3d(x, y, z, highlight.3d=TRUE, col.axis="blue",col.grid="lightblue", main="scatterplot3d - 1", pch=20)
>
> I would like to ask if anyone could help me with the following:
>
> 1. I would like to draw  a plane across the plot that is paralell to the bottom of the plot and is in the heights of the value 6 on the axis "z", and goes across the plot

This is hard to do in scatterplot3d, because some points should be 
hidden and others shown in front of such a plane, but scatterplot3d has 
no way to do that.  You could do it using the rgl package; the commands 
there would be something like this (without the coloring you did in 
scatterplot3d):

plot3d(x,y,z)
planes3d(0,0,-1,6,col="red")

> 2. Is there a way to color all plotted values with the "z" variate less than the value of 6 one color, and all the rest another color?

In rgl you would do it using

plot3d(x,y,z, col=ifelse(z < 6, "blue", "red"))

I think the same sort of thing works in scatterplot3d, but the arg name 
is color, not col.

Duncan Murdoch


>
> I would greatly apreciate the help on this,
>
> Sincerely,
>
> Andras
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>
>
>
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