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). Best regards, baptiste -- ____________________ Dr. Baptiste Auguié Departamento de Química Física, Universidade de Vigo, Campus Universitario, 36310, Vigo, Spain tel: +34 9868 18617 http://webs.uvigo.es/coloides ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.