Anaglyph (3D): Difference between revisions

== Anaglyph, that weird looking glasses... ==

As you might know or not, FlightGear migrated graphics functions from [[PLIB]] to [[OSG]]. [[FlightGear 1.9.0]], released Decemeber 22, 2008, marked the release of the OSG version of FlightGear. As of August 2010, most recent stable version of FlightGear uses OSG. For those who are unaware of OSG, it is an open source high performance 3D graphics toolkit.

== How to multiply your realism level by 10 ==

For this experience, you will need  

# A working copy of FlightGear, of course.

# A pair of Red-Green or Red-Cyan pair of 3D glasses. You might have one at home or if you are a DIY type, check [http://stereo.gsfc.nasa.gov/classroom/glasses.shtml NASA way of doing glasses] or [http://en.wikipedia.org/wiki/Liquid_crystal_shutter_glasses Liquid Crystal Shutter Glasses] and probably suitable hardware (anyone experienced with or owns one pair of this thing might help developing this page).

  ( for versions later than 2.0 see above )

[[File:Anaglyph1.jpg|thumb|Accessing advanced options.]]

[[File:Anaglyph2.jpg|thumb|Final result in Environment settings.]]

After you entered the last value, click "OK" to quit from the Advanced Options window. Remove your pilot raybans, put your fancy 3D glasses and click "Run".

When launching FlightGear from the [[Command line options|Command line]], the environment variables should be set as follow, in the same Command Prompt window (same batch file if applicable) as the one used for FlightGear.

   SET OSG_SCREEN_WIDTH=0.33

[[File:Anaglyphic2.jpg|thumb|Red-Green Anaglyph OSG Render in action]]

Thanks to [http://flightgear.org/forums/memberlist.php?mode=viewprofile&u=1650 someguy] (not some guy, a FlightGear forum member!) for providing Mac OS X instructions. And here is the related [http://www.flightgear.org/forums/viewtopic.php?f=19&t=9222&p=93141#p93141 post]with more screenshots.

# In the Finder, select the menu item Go > Go to Folder... and enter "~/.MacOSX" without the quotes. You will go to a hidden folder in your user directory.

# You should see a file named "environment.plist". Open it in TextEdit.

# Between the <dict> and </dict> tags, add the following:

   <key>OSG_EYE_SEPARATION</key>

|}

The very final part of the OSG stereo view options consists of few variables that accommodate the device specific issues and finally allows you to set straight look or cross-eyed look (not advised) options.  

'''OSG_SPLIT_STEREO_VERTICAL_EYE_MAPPING''' works the same way as horizontal mapping, displaying upper and lower images respectively. The string variables are LEFT_EYE_TOP_VIEWPORT and LEFT_EYE_BOTTOM_VIEWPORT, which are quiet self-explanatory.

* [http://www.openscenegraph.org OSG Website]

* [http://www.openscenegraph.org/projects/osg/wiki/Support/UserGuides/StereoSettings Stereo Settings]

* [http://en.wikipedia.org/wiki/Anaglyph_image Anaglyph Image on Wikipedia]

* [http://en.wikipedia.org/wiki/Retinal_rivalry An important warning about using highly filtering glasses]