Hi, I am trying to install the package for DECORANA onto R, I have tried the CCA and it does not seem to work. Does anyone know? Tawanda
On Fri, Nov 13, 2009 at 9:53 AM, kvarpun <jallouli.med.am...@gmail.com>wrote: > > > Duncan Murdoch-2 wrote: > > > > On 11/12/2009 11:37 AM, kvarpun wrote: > >> > >> Duncan Murdoch-2 wrote: > >>> > >>> On 11/12/2009 4:56 AM, kvarpun wrote: > >>>> Hi, > >>>> > >>>> Is there an R package that reads and writes 3D images having the > >>>> extension > >>>> PLY (PLY images of Stanford University)? > >>>> > >>>> Currently, I installed the package misc3d. This package displays these > >>>> images PLY, but it can neither read nor write PLY images. > >>> > >>> This doesn't make sense. How can it display PLY images if it can't > read > >>> them? Could you give an example? > >>> > >>> Duncan Murdoch > >>> > >>>> > >>>> Thank you to tell me the name of a package that will read and write > >>>> such > >>>> images. > >>> > >>> ______________________________________________ > >>> 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. > >>> > >>> > >> > >> Thank you for quick answer. > >> I have to inform you that the only available functions in the package > >> misc3d > >> are: > >> > >> contour3d Draw an Isosurface, a Three Dimension Contour > >> Plot > >> drawScene Rendering of Triangular Mesh Surface Data > >> image3d Draw Points on a 3D Grid > >> kde3d Compute a Three Dimension Kernel Density > >> Estimate > >> makeTriangles Triangle Mesh Functions > >> parametric3d Draw a 3D Parametric Plot > >> perspLighting Lighting Functions > >> phongLighting Lighting Functions > >> pointsTetrahedra Create a Set of Tetrahetra Centered at Data > Points > >> scaleTriangles Triangle Mesh Functions > >> slices3d Interactive Image Slices of 3D or 4D Volume > >> Data > >> surfaceTriangles Create a Triangle Mesh Representing a Surface > >> teapot Utah Teapot > >> translateTriangles Triangle Mesh Functions > >> updateTriangles Triangle Mesh Functions > >> > >> None of them does read/write a PLY file. > >> > >> > >> You will find below a simple code for drawing a 3D image. The displayed > >> image is stored in the package misc3d (not read from a file). > >> > >> library(misc3d) > >> data(teapot) > >> > >> haveRGL <- suppressWarnings(require(rgl,quietly=TRUE)) > >> ttri <- makeTriangles(teapot$vertices, teapot$edges, color = "red", > >> color2 = > >> "green") > >> > >> ## draw the teapot > >> drawScene(ttri,screen=list(y=-30,x=40), scale = FALSE) > >> > >> str(teapot) > >> # > str(teapot) > >> # List of 2 > >> # $ vertices: num [1:3, 1:1976] -3,00 1,65 0,00 -2,99 1,65 ... > >> # $ edges : int [1:3, 1:3751] 1455 1469 1459 1449 1455 1459 1462 1449 > >> 1459 > >> 1469 ... > >> > >> # My images (PLY images) have vertices and edges like the teapot image > in > >> the example. If PLY images are read by R, I will be able to manipulate > >> them. > > > > Okay, I understand now. Yes, R can display 3D images based on lines and > > polygons using the rgl package or scatterplot3d or grid graphics, but > > those have nothing to do with PLY files. As far as I know there is no > > existing code to read or write a PLY file, but from the look of it, it's > > a simple format and it wouldn't be hard to write input/output routines. > > The likely problems are: > > > > - it's an open ended format, with each application allowed to define > > its own record types. If your files come from an application that did > > that you may have trouble working out what was intended and reading it > in. > > > > - some of the recommended elements are not supported in rgl or other > > 3D renderers in R. In particular, polygons with more than 4 vertices > > need to be decomposed into triangles or quads, and rgl knows nothing > > about refraction index: you'd probably need a ray-tracing renderer for > > that. > > > > - rgl scenes contain text, and as far as I can see, there's no way to > > include that in a standard PLY file, so you'd need to invent your own > > record type for it. Text is always hard to describe graphically, so > > this wouldn't be easy. > > > > Duncan Murdoch > > > > ______________________________________________ > > 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. > > > > > Thank you for all these precisions. > I guess developping an R package for reading/writing PLY files is required. > Have a nice day. > > -- > View this message in context: > http://old.nabble.com/R-package-for-reading---writing-3D-file-%28.-PLY%29-tp26315292p26333989.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > [[alternative HTML version deleted]] ______________________________________________ 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.
