On Sun, Jul 27, 2008 at 1:41 AM, Oliver M. Haynold <[EMAIL PROTECTED]> wrote:
> On Sun, 27 Jul 2008 05:00:48 +0000, Oliver M. Haynold wrote: >> I am using wireframe from the lattice package, with the shade option set >> to TRUE. When I output to PDF or Postscript, a line gets drawn around >> each polygon of my surface which causes ugly Moiré effects and doesn't >> make sense in my application (think the plot of Maunga Whau--gridlines >> don't make sense). This does not happen when I display on the screen-- >> then I just get the surface as intended. > > I have done some research on the problem. On inspection of the PDF file > generated by lattice, it turns out that it does not actually contain any > instructions to draw lines between the triangles of the surface plot. > Yet, Evince and Acrobat Reader both show these lines, with disagreeable > consequences for printing and screen display. Does the rendering improve if you unset the "smooth line art" option in Acrobat's settings? > Ghostscript, however, does > not and renders the surface as a solid block, as it should be. Thus, a > workaround for the problem is to put the file generated by lattice > through Ghostscript and to convert it into a high-resolution image file. > > The most likely reason for the problem I can think of is that the > triangles generated by lattice don't overlap but just border each other. > This might cause some renderers to leave a little space between them. If > this explanation is correct, a solution would be to have lattice, or > specifically wireframePanelCalculations, plot the triangles with a tiny > bit of overlap. I don't think that's going to happen. -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.
