On 13-09-15 6:02 AM, Andreas Maunz wrote:
The other write* options seem to limited to me. I am looking for a way
to obtain a PS, or at least a PNG, since I develop a web application on
a server that needs to grab the screenshot and create a written report
with it. Starting my Xvfb like this:
Xvfb :5 -screen 0 640x480x24 -ac +extension GLX +render -noreset -fbdir
/tmp/foobar
I can easily run glxgears and obtain nice snapshots of the gears via
'xwud -in /tmp/foobar/Xvfb_screen0'. However, it just won't work for
rgl! Given my test.R script with (taken from the doc of bg()):
That does make it sound like an rgl problem.
library('rgl')
rgl.open()
foo<-readline('Enter to cont')
bg3d("white")
foo<-readline('Enter to cont')
rgl.bg <http://rgl.bg>(sphere=TRUE, color=c("black","green"), lit=FALSE,
back="lines" )
foo<-readline('Enter to cont')
rgl.bg <http://rgl.bg>(sphere=TRUE,
texture=system.file("textures/sunsleep.png", package="rgl"), back="filled" )
foo<-readline('Enter to cont')
I can skip through the steps and check at each with xwud, but it just
manages to draw the white background. The two last steps fail
completely, I only receive a black screen. Sane for plot3d(), for example.
Please help, if you can, it would be quite important to have this
functionality
I can't reproduce any of this, since I'm working on Windows, a system
without Xvfb, and Mac OSX, where your Xvfb command fails with this error
_XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be
created.
(followed by a sequence of other errors). So I'd like to fix this, but
it just doesn't look feasible. Perhaps you know some X11 expert who can
tell you what rgl is doing wrong?
Duncan Murdoch
Thanks
Andreas
On Wed, Sep 11, 2013 at 6:19 PM, Duncan Murdoch
<murdoch.dun...@gmail.com <mailto:murdoch.dun...@gmail.com>> wrote:
On 11/09/2013 11:44 AM, Andreas Maunz wrote:
I am running Xvfb now with
-fbdir /some/path and
-extension RANDR
but rgl.snapshot is still not working.
Any other idea? Since I can display the webGL successfully in
firefox (so comes out correct), I assume there should be some
way of converting it on the server side to some (vector) graphic
file format?
The .html file that writeWebGL produces could be considered to be
that, but it's really mostly Javascript code, and I don't know
anything other than a browser that can display it. If you look at
?writeWebGL, you'll see links to various other ?write* files; they
are all vector formats, but are all more limited than writeWebGL in
what they can record.
Duncan Murdoch
Thanks
Andreas
On Tue, Sep 10, 2013 at 6:38 PM, Duncan Murdoch
<murdoch.dun...@gmail.com <mailto:murdoch.dun...@gmail.com>
<mailto:murdoch.duncan@gmail.__com
<mailto:murdoch.dun...@gmail.com>>> wrote:
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
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