SIV-1.0 released

I’m proud to present a new version of SIV, the stereoscopic jps viewer for Linux I published first in SIV – a stereoscopic jps viewer for Linux. 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 should also work with an Ati FireGL, but I never tried this. The new version fixes some segfaults, that occured when needed libraries were missing. Furthermore I added a slideshow mode and the possibility to specify a default distance and therefore the possibility to set a default zoom factor. The coolest feature I added to the viewer is the headtracking support for the Vuzix VR920 HMD. For this you will need (in addition to the device 😉 ) the headtracking driver, I published in VR920 headtracking driver for Linux. You may watch  a video (demo_siv_headtracking_vr920) of me using the viewer with enabled headtracking to view some photos of NASA’s Apollo missions  downloadable from nvidia forums.

Usage changes:

New commandline options are:

  • -s                                         Enable slideshow mode
  • -t                                         delay Delay for slideshow mode,
    defaults to 10 sec
  • -d                                         distance (values between 0.0 and
    1.0 are senseful)

These new options control the new headtracking support:

  • –vr920                             enable headtracking support for the vuzix vr920 hmd
  • -m                                        non default multicast ip
  • -p                                         non default multicast port

For detailed information on the -m and -p options see the article about the headtracking driver : VR920 headtracking driver for Linux. They have the corresponding meaning. If you want to try out the headtracking, enable the headtracking support with the –vr920 option. You may want to specify the distance to the image with the -d option. Values between 0.25 and 0.5 seem to have a nice effect when using the headtracking. When headtracking is active you may press Z to set the zero view so that with your current head position you will see the center of the image. If you want to manipulate the view manually press 2 to enable the trackball manipulator and use i.e. the right moue button and up or down movements (with the mouse) to control the distance (zoom in or out). Afterwards press 1 to activate headtracking again.

For more usage documentation see: SIV – a stereoscopic jps viewer for Linux

Download:      

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: SIV-1.0 source (1025) or an x86_64 binary from here:  SIV-1.0 x86_64 binary (1018). 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.

Footnote:

If you like the viewer, feel free to link to www.mygnu.de. To request commercial licenses contact us at info(at)mygnu.de. Well, if you just want to support our work on MyGNU.de use the donate button 😉

best regards and enjoy the 3rd dimension

Jürgen

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JPS-viewer for linux

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:

jpsviewer-anaglyph

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.

Stay tuned for updates

Jürgen

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Vuzix VR920 with Linux and active 3D stereo

I recently received my VR920 3D stereo glasses from USA. A detailed review of the device can be found here : Introducing the Vuzix iWear VR920. A photo of the VR920 can be seen below:

VR920 HMD

The device of course works flawlessly using Windows. The situation under Linux is a bit different, due to missing driver support from the manufacturer, as usual.

Stereo vision works at least with nvidia quadro boards, probably also with others. I.e. Ati FireGL should work, but I never tried this. Setting this up was easy. I only had to start a second XServer and add the line

Option “Stereo” “1″

into the screen section of its xorg.conf. With this setting you get a different image for both eyes and thus real stereo vision if your application supports quad-bufferred stereo. It is important that the screen resolution is between 640×480 and 1024×768 and the refresh rate is 60 Hz. The xorg.conf you are using for this must not use the composite extension. For disabling the Composite extension append the following to the xorg.conf:

Section “Extensions”
Option         “Composite” “Disable”
EndSection

Sadly this also prevents the use of compiz, hopefully Nvidia fixes the incompatibility between stereo and the composite extension some day.

For starting the xserver i use the following little script, which opens 2 xterms and starts the program (given as parameter with arguments) in one of them.

#!/bin/bash

/usr/X11R6/bin/X :1 -dpi 96 -xf86config ./xorg.conf.3d -auth /var/gdm/:1.Xauth vt8 &
DISPLAY=:1.0
export DISPLAY
sleep 5
icewm&
hotkeys&
xterm -fn 9×15&
xterm -fn 9×15 -e $@&

The headphone gets detected as alsa device:

usb 2-2: new full speed USB device using uhci_hcd and address 8
usb 2-2: configuration #1 chosen from 1 choice
generic-usb 0003:1BAE:0002.0002: hiddev0,hidraw1: USB HID v1.00 Device [Icuiti Corp. VR920 Video Eyewear] on usb-0000:00:1d.1-2/input3
usb 2-2: New USB device found, idVendor=1bae, idProduct=0002
usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 2-2: Product: VR920 Video Eyewear
usb 2-2: Manufacturer: Icuiti Corp.
usbcore: registered new interface driver snd-usb-audio

cat /proc/asound/cards:

1 [ Eyewear ]: USB-Audio – VR920 Video Eyewear
Icuiti Corp. VR920 Video Eyewear at usb-0000:00:1d.1-2, full speed

I was able to get mplayer to play on the device by setting the output device to hw=1,0 .

Sadly the mixer does not seem to work. At least the mixer levels are not controllable. Perhaps any alsa developer has an idea for this? It is even more important since the mixer control wheel at the device freezes after three steps when using linux.

More important than having controllable sound is to get the integrated headtracking to work. There is a non-working driver at vuzix forums. At least it can read the sensor data from the device but does not seem to handle the data correctly. I will look into this soon.

Update: My VR920 headtracking driver is now available here: VR920 headtracking driver for Linux

Playing with the device I had to find out that there is no jps stereoimage viewer for linux. The only programm I found, which is able to read jps-images, is gqview (GQView3D). Sadly gqview is not able to display theese images using active quad-buffered stereo. Thus I decided to write my own jps viewer. It will be based upon OpenSceneGraph (OpenSceneGraph) since I have some experience in OpenSceneGraph development. Perhaps I can integrate headtracking into it. Would be really cool to view a sea panorama image in 3D by turning the head :)

Stay tuned for updates.

Jürgen

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