The World wide web was invented 20 years ago. In March 1989 Tim Berners-Lee wrote a proposal suggesting hypertext documents. Without Tim’s invention we would not be able to present our content on MyGnu to you. So MyGNU says happy birthday www and thanks, Tim. For more information on the www and its history see Wikipedia:www.
Today, while performing a large world upgrade on my gento x86_64 system, I noticed almost every build segfaulting (internal compiler error…). In the meanwhile I was encoding several videos (xvid) with avidemux. thus I had a somewhat high memory usage. Some of the avidemux processes also segfaulted. I noticed these segfaults also yesterday, but thought something was wrong with my video files. After many segfaults the system then ran completely out of memory and I had to reboot.
NVIDIA should really do better testing with their drivers before releasing. Errors like this are normally extremely hard to track down, since nobody would suspect the graphics driver to be the reason for this. Well, in this case intuition saved me a lot of time…
Today, when I tried to connect to the icq network (on login.oscar.aol.com) I got the error:
“The client version you are using is too old. Please upgrade at http://pidgin.im/”.
I use pidgin-2.5.2 from gentoo portage tree. Everything newer is masked on x86_64 architecture.
emerge “>net-im/pidgin-2.5.2”
…
!!! All ebuilds that could satisfy “>net-im/pidgin-2.5.2” have been masked. !!! One of the following masked packages is required to complete your request: – net-im/pidgin-2.5.5 (masked by: ~amd64 keyword) – net-im/pidgin-2.5.4-r1 (masked by: ~amd64 keyword) – net-im/pidgin-2.5.4 (masked by: ~amd64 keyword) – net-im/pidgin-2.5.3 (masked by: ~amd64 keyword)
Is anyone else experiencing this problem?
Addon:
I just upgraded to pidgin 2.5.5 and icq works again 🙂 . Hopefully everything else works also…
Gentoo x86_64 can do this easily by adding
=net-im/pidgin-2.5.5 **
to their /etc/portage/package.keywords and reemerging pidgin.
As promised in JPS-viewer for linux, here comes the very first release of SIV, the first available Stereoscopic Image Viewer for Linux supporting quad buffered stereo. Well this is not 100% correct, since it is build upon OpenSceneGraph it is somewhat platform independant and schould compile well on windows, mac and unix platforms. However, I only tried with linux since there are enough alternatives available for most other platforms.
SIV is capable of displaying jps stereo images in different stereo modes. I tried it in fullscreen/windowed mode with anaglyphic and quad buffered stereo mode. Different output devices I tested were my Vuzix VR920 and relevator shutter glasses on Nvidia Quadro FX 350M and FX 3400. It still lacks some convenience functions like a diashow mode.
Screenshot of the viewer as window in anaglyphic mode:
A note about the name SIV, SIV stands for Stereoscopic Image Viewer, but as I found out Siv is also the name of the wife of the god Thor in the norse mythology. See: Wikipedia: Sif and Behindthename: Siv. Sif and Siv are the same name, both writings are possible. Once I found out this, I thought that’s a cool name for this piece of work.
Usage:
./siv [options] jpsfile(s) Options: –CullDrawThreadPerContext Select CullDrawThreadPerContext threading model for viewer. –CullThreadPerCameraDrawThreadPerContext Select CullThreadPerCameraDrawThreadPerCo- ntext threading model for viewer. –DrawThreadPerContext Select DrawThreadPerContext threading model for viewer. –SingleThreaded Select SingleThreaded threading model for viewer. –accum-rgb Request a rgb accumulator buffer visual –accum-rgba Request a rgb accumulator buffer visual –cc Request use of compile contexts and threads –clear-color <color> Set the background color of the viewer in the form “r,g,b[,a]”. –display <type> MONITOR | POWERWALL | REALITY_CENTER | HEAD_MOUNTED_DISPLAY –rgba Request a RGBA color buffer visual –samples <num> Request a multisample visual –screen <num> Set the screen to use when multiple screens are present. –serialize-draw <mode> OFF | ON – set the serialization of draw dispatch –stencil Request a stencil buffer visual –stereo Use default stereo mode which is ANAGLYPHIC if not overriden by environmental variable –stereo <mode> ANAGLYPHIC | QUAD_BUFFER | HORIZONTAL_SPLIT | VERTICAL_SPLIT | LEFT_EYE | RIGHT_EYE | HORIZONTAL_INTERLACE | VERTICAL_INTERLACE | CHECKERBOARD | ON | OFF –window <x y w h> Set the position (x,y) and size (w,h) of the viewer window. -O <option_string> Provide an option string to reader/writers used to load databases -e <extension> Load the plugin associated with handling files with specified extension -h or –help Display this information -l <library> Load the plugin
You may notice that most of the options come from osgViewer, which is the base class for the viewer. This gives the advantage, that one can use the “normal” osgViewer controls such as flying around the scene. Try holding the right mouse button and moving the mouse up or down for zooming out or in. Or press F for toggling fullscreen mode or press S for toggling the stats (fps, etc.) display.
You may supply multiple .jps files at the command line. I.e. ./siv *.jps will display all jps files in the current folder 😉
Once the first image of the list is being displayed you may use CURSOR_UP/DOWN or the mouse wheel to select a different image for being displayed. In future versions I may implement a diashow function…
When displaying an image the filename of the image is displayed in the lower left corner.
As default SIF starts in fullscreen quad buffered stereo mode. Thus if your graphics hardware does not support this mode, the viewer will exit with the following error:
Error: Not able to create requested visual. GraphicsWindow has not been created successfully. Viewer::realize() – failed to set up any windows
In this case try anaglyphic mode or the apropiate 3D mode for your hardware (see the –stereo option).
You may experience the application segfaulting. Most possibly the reason is that your OpenSceneGraph lacks the library osgdb_jp2.so in the lib/osgPlugins folder. If you strace the application and the last thing it tries before segfaulting is to access osgdb_jp2.so, this is the reason. The Problem will be corrected in the next version of SIV. For now install Jasper and rebuild OpenSceneGraph.
Download:
Do not download these files anymore unless you explicitely want this version. New version is available at: SIV-1.0 released
I decided to publish the viewer under the creative common noncommercial license. Make sure you have the OpenScenegraph library installed before trying to compile or run the viewer. You may download the full source (Eclipse Project) from here:
. More binary formats may be available in the future. Fore the x86_64 binary you’ll need OpenSceneGraph-2.8.
Binaries for most linux distributions can be downloaded from www.openscenegraph.org. Instructions on how to build OpenSceneGraph on gentoo can be found on PlopByte.
Building from source:
For building from source unpack the zip and cd to siv/Release and run make.
Future plans:
For the future I’d like to implement a diashow function and to integrate the VR920 headtracking into the viewer. It would be really cool to view a sea panorama image in 3D by turning the head This is the reason why the image is not being displayed plain, but on a cylinder segment. For the tracking I’ll have to write a driver for the VR920 headtracking first, to get the camera viewmatrix for the viewer. Since in Vuzix Forums I found a non working driver, from which I was able to learn how to read the sensor data, I only have to implement the neccesary calculations and calibration methods.
Well, I hope you enjoy the 3rd dimension. If you like the viewer feel free to link to MyGNU.de.
Yesterday I ran the usual system upgrades of my gentoo system (emerge –sync;emerge -uND world). After a reboot I noticed that in my gnome-terminal CTRL-C and CTRL-Z didn’t work any more. I also noticed that nautilus was using up one CPU completely.
The first reason I thought of was the kbd upgrade to 1.15. I tried to downgrade to 1.13-r1 again, but this did not solve the problem, but anyways, I’ll stay with 1.13 until the init script problems are solved in a newer ebuild.
After some hours of searching and trying I found the following in my dmesg output:
bluetooth-apple[9380] general protection ip:7f277c8b7e5e sp:7fff8b5fd270 error:0 in libGL.so.180.35[7f277c861000+a4000]
So I tried recompiling the bluetooth applet with no success. Well, it did compile, but the error was still there afterwards.
Afterwards the dmesg output hinted me to try downgrading nvidia-drivers from 180.35 to 180.29 , which solved the problem.
As I stated before in Vuzix VR920 with Linux and active 3D stereo, I planned to write the first stereo enabled jps viewer for linux. At least I was not able to find a viewer for jps stereoimages that is capable of displaying in active pageflipped stereo.
I made some progress in writing the viewer. The viewer itself depends on OpenScenegraph. It is now capable of displaying jps stereo images in different stereo modes. I tested it in fullscreen/windowed mode with anaglyphic and quad buffered stereo mode. Different output devices I tried were relevator shutter glasses and my Vuzix VR920 on Nvidia Quadro FX 350M and FX 3400. Here comes the first screenshot of the viewer in windowed mode:
Of course the screenshot is of the viewer in anaglyphic only, since I can’t include anything else in the blog 😉
I still have to do some code cleanup. But expect the viewer to be published soon.
MyGNU.de
This is the reason why the image is not being displayed plain, but on a cylinder segment. For the tracking I’ll have to write a driver for the VR920 headtracking first, to get the camera viewmatrix for the viewer. Since in Vuzix Forums I found a non working driver, from which I was able to learn how to read the sensor data, I only have to implement the neccesary calculations and calibration methods.
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