[R] question on rgl.surface

[Mark Kimpel]

I'd like to use rgl.surface (or some other function if more
appropriate) to create a horizontal and vertical transparent grey
slice (plane) running through both the x and y origins and extending
across the z axis, i.e. the 3-d equivalent of the normal 2-d
coordinate axes we are all familiar with. The examples for rgl.surface
are a bit more complex than what I need and I am having trouble
understanding them.

Here is the code if I come up with, but which obviously doesn't work.

require(rgl)
set.seed(123)
d3.mat <- matrix(runif(30, min = -5, max = 5), ncol = 3, nrow = 10)
open3d()
plot3d(x = d3.mat, type = "s", col = "blue", size = 0.33, xlab ="x",
ylab = "y", zlab = "z")
x <- 0
y <- 0
z <- matrix(c(floor(min(d3.mat[,1])),ceiling(max(d3.mat[,1])),floor(min(d3.mat[,3])),ceiling(max(d3.mat[,3]))),nrow
= 2, ncol =2)
rgl.surface(x, z, y, color="grey", back="lines")

What am I doing wrong?

And, while I'm at it, there is another minor question I have, which is
"how can I exaggerate the size difference in the spheres between front
and back?"

Thanks,
Mark

-- 
Mark W. Kimpel MD ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine

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