[R] 3D or 4D plot

[Tony Breyal]

Wow, i had no idea R was capable of producing graphics like that,
smegging awesome!

On 20 Feb, 19:28, Duncan Murdoch <murd... at stats.uwo.ca> wrote:
> On 2/20/2009 1:55 PM, Duncan Murdoch wrote:
>
>
>
> > On 2/20/2009 1:46 PM, kapo coulibaly wrote:
> >> Ideally I would want it to look like a rubik cube with each little cube
> >> color coded based on the fourth column (data column). Your suggestion might
> >> work if I could color code based on data in the fourth column.
> >> Thanks
>
> > There's no primitive "cube" symbol in rgl, but you can get an array of
> > colour-coded spheres:
>
> > x <- rep(1:3, each=9)
> > y <- rep(rep(1:3, each=3), 3)
> > z <- rep(1:3, 9)
> > colours <- terrain.colors(27)
> > plot3d(x,y,z,col=colours, type="s", size=10)
>
> > If you really want cubes, you can put them together (start with cube3d()
> > to get one, and build on that), but it's a lot of work.
>
> But it's Friday, so fun things like that are worth doing.  Here's some
> code to draw a bunch of cubes with a variety of colours.  Elaborate on
> it if you like.
>
> Duncan Murdoch
>
> cubes3d <- function(x,y,z,col="red",size=0.9,plot=TRUE) {
>
>      xyz <- xyz.coords(x, y, z, recycle = TRUE)
>      x <- xyz$x
>      y <- xyz$y
>      z <- xyz$z
>
>      col <- rep(col, len=length(x))
>      size <- rep(size/2, len=length(x))
>
>      result <- list(vb=matrix(0, 4, 0), ib=matrix(1L, 4, 0),
> primitivetype="quad",
>                     material=list(color=NULL, normals=NULL))
>      class(result) <- "qmesh3d"
>
>      for (i in seq_along(x)) {
>         cube <- translate3d(scale3d(cube3d(), size[i], size[i],
> size[i]), x[i], y[i], z[i])
>         offset <- ncol(result$vb)
>         result$vb <- cbind(result$vb, cube$vb)
>         result$ib <- cbind(result$ib, cube$ib + offset)
>         result$material$color <- c(result$material$color, rep(col[i],
> 4*ncol(cube$ib)))
>      }
>      if (plot)
>         shade3d(result)
>      invisible(result)
>
> }
>
> x <- rep(1:5, each=25)
> y <- rep(rep(1:5, each=5), 5)
> z <- rep(1:5, 25)
> cubes3d(x,y,z,col=terrain.colors(125))
>
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