On 08/27/2010 08:11 PM, baptiste auguie wrote:
Dear list,
I wish to visualise some 4D data as a kind of colour / translucent
cloud in 3D. I haven't seen such plots in R (but perhaps I missed a
feature of rgl). The easiest option I found would be to export the
data in povray's df3 (density file) format and visualise it with
povray.
The format specification baffles me a little,
http://www.povray.org/documentation/view/3.6.1/374/ ; fortunately I
found a few C++ utilities that could do the conversion from a plain
ascii datafile to this format. Basically, I wish to create a set of
xyz coordinates and a scalar function value in R, export it as a
regular ascii file, convert it to df3 and visualise it in povray.
An example of data from the R side would be,
N<- 10
xx<- seq(0,N)
d<- expand.grid(x=xx,y=xx,z=xx)
d$t<- runif(nrow(d), 0, 255)
cat(file="data.dat", "1 1 1\n")
write.table(d,file="data.dat",row.names = F,
col.names = F,append=T)
I wonder if anyone here ever played with this idea and could offer
some suggestions (I couldn't get it to work so far).
Hi Baptiste,
I once fooled around with a set of functions I wrote to produce 3D plots
as rendered objects with POVray. The functions really just translated R
code into POVray code and wrote a file that was then passed to the
POVray interpreter. If you find that Deepayan's suggestion of misc3d
won't do it, I could probably dig out the old code I wrote, although it
wasn't exactly what you are doing.
Jim
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