Re: [R] export 4D data as povray density files
Thanks – figure 3 is actually pretty close to what I had in mind. I had forgotten about this package. I still hope to work out the povray route as the end result look really good (and that's probably the main point of such graphics). Best, baptiste On Aug 27, 2010, at 12:37 PM, Deepayan Sarkar wrote: > On Fri, Aug 27, 2010 at 3:41 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. > > This is not answering your question, but might the misc3d package be > relevant for you? > > http://www.jstatsoft.org/v28/i01/ > > -Deepayan __ 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.
Re: [R] export 4D data as povray density files
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 __ 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.
Re: [R] export 4D data as povray density files
On Fri, Aug 27, 2010 at 3:41 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. This is not answering your question, but might the misc3d package be relevant for you? http://www.jstatsoft.org/v28/i01/ -Deepayan __ 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.
[R] export 4D data as povray density files
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.
