Yes, we have done this before, though I don't remember with absolute certainty if we did it with chimera. You don't use 2 video cards normally, but rather 1 card with 2 outputs. Also, you will need one of the 'professional' cards where the driver supports stereo in a window ie- NVidia Quadro (we didn't try ATI). The NVidea stereo drivers then have a mode for this type of stereo, or at least that's my memory, it was a year or two ago when we demonstrated this. You need: 2 identical projectors which permit geometry correction so their corners can be exactly aligned 2 polarizer plates. we got (http://www.3dstereo.com/viewmaster/pj-pfilt-3x3.html ) for $20 a pair linear polarizing glasses (from the same site) Quadro or similar GFX card Note that with this type of stereo, you could technically make this work with any old dual output 3-D card, but you would have to write the visualization software so it would open 2 display windows with slightly different orientations that you could then manually (or automatically) position on each of the 2 projectors. We did this just as an initial proof of concept, and haven't managed to get back to it again, though we keep meaning to, as it is MUCH cheaper than the commercial solutions. Oh, one warning, the polarizer plates mentioned above are plastic, and the light energy put out by your typical projector is quite substantial. We actually melted one of the polarizers on our first attempt, despite using much of it's 3x3 inch surface area. ie - use a low power projector, or put the polarizer between thick glass plates or somesuch...

From: Magali Cottevieille <mc3077@columbia.edu> Date: May 21, 2008 3:06:07 PM CDT To: chimera-users@cgl.ucsf.edu Subject: [Chimera-users] Stereo projection

Hi,

Is there any way, with two projectors piloted by two graphic cards, to send from Chimera the stereo left eye view onto one, and the stereo right eye view onto the other one ? These two projectors are meant to be used with filters and special glasses to create a 3D view. Thanks for your help!

-- Magali Cottevieille, Ph.D. Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, 630 W 168th St, P&S Black Building 2-221 New York, NY 10032

Ph: (+1) 212-305-9521 Fax: (+1) 212-305-9500

Email: mc3077@columbia.edu magali.cottevieille@gmail.com

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