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()):
library('rgl')
rgl.open()
foo<-readline('Enter to cont')
bg3d("white")
foo<-readline('Enter to cont')
rgl.bg(sphere=TRUE, color=c("black","green"), lit=FALSE, back="lines" )
foo<-readline('Enter to cont')
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
Thanks
Andreas
On Wed, Sep 11, 2013 at 6:19 PM, Duncan Murdoch <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.duncan@gmail.**com <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
>>
>>
>>
>
[[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.
