On 10/09/2013 10:58 AM, Andreas Maunz wrote:
Hi all,I have a shiny app, in which I want to use rgl's snapshot function. I am running Xvfb on my server so that rgl works. I start my shiny app as follows: echo "Checking for Xvfb..." pgrep -U username Xvfb > /dev/null 2>&1 if [ "$?" -gt 0 ]; then echo "Starting Xvfb..." Xvfb :7 -screen 0 1280x1024x24 & sleep 2 fi echo "...starting shiny" export DISPLAY=":7"; R --no-save --no-restore -e "library('shiny'); runApp('/path/to/app', port=8101)" In the app, I do plot3d(), generate webGL and send the results to the browser. But the rgl.snapshot or rgl.postscript functionality do not work, i.e. they produce black or empty images. I assume this is due to Xvfb. Any chance I can create snapshots?
rgl.snapshot requires the X server to maintain a frame buffer that it can read. It looks as though something is going wrong with yours. I don't use a system with Xvfb, so I can't really help, but you could try Googling to see if that turns anything up.
rgl.postscript shouldn't need the X server, but it is limited in what it can display.
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.
