On 10/5/2005 11:10 AM, Prof Brian Ripley wrote: > On Wed, 5 Oct 2005, Duncan Murdoch wrote: > >> On 10/5/2005 9:31 AM, Prof. Paul R. Fisher wrote: >>> Hi all >>> I am a complete newbie to this list (just subscribed) and a newcomer to >>> R (an S user from olden times). I have been using scatter3d to create a >>> 3d scatter plot with surface. The graphic is created within the rgl >>> package and I have used rgl.postscript to export it so I can generate a >>> publication quality image. My problem is that the plotted surface is no >>> longer transparent in the postscript output ie. the rgl.spheres that are >>> behind the surface disappear in the postscript image. Can't seem to find >>> any info on this anywhere. Am I doing something wrong? Is there an easy fix? >> >> I think Postscript doesn't support transparency (or at least the version >> of Postscript that the rgl.postcript function targets doesn't support >> it). You may have to export a bitmapped format using the rgl.snapshot() >> function. If your original window is very large this may give you good >> enough quality. > > Common PostScript (level 2) does not support either full or partial > transparency (and I guess partial transparency is meant here or the > surface could just not be plotted). It would be good to have a rgl.pdf > which did. These days PDF is the `portable PostScript' and since version > 1.4 has had alpha-channel supoort. > > Ref: > > http://en.wikipedia.org/wiki/Transparent_pixels#Transparency_in_PostScript > >
The library we use (GL2PS) apparently supports PDF output, and that's one of the format options for rgl.postscript(), so maybe we already do support that. I haven't tried it. Duncan Murdoch ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
