[R] 3D or 4D plot

[Duncan Murdoch]

One more followup on this:  I just added a function shapelist3d() to rgl 
(so far only on R-forge, not CRAN) that automates a lot of this.  To get 
the plot as below, the following code works:

x <- rep(1:5, each=25)
y <- rep(rep(1:5, each=5), 5)
z <- rep(1:5, 25)
shapelist3d(cube3d(), x,y,z, size=0.45, col=terrain.colors(125))

But now you can do fancier stuff, like

shapelist3d(list(tetrahedron3d(), cube3d(), octahedron3d(),
                  dodecahedron3d(), icosahedron3d()),
                  x,y,z, size=0.45, col=terrain.colors(125))

Duncan Murdoch

On 2/20/2009 2:28 PM, Duncan Murdoch 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))
> 
>