Re: passive stereo on Onyx2-IR

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MLM Veraart (Veraart++at++fel.tno.nl)
Mon, 05 Jul 1999 17:31:33 +0200

k. lukose wrote:
>
> Can someone offer any information on "passive" stereo viewing on an Onyx2-IR.
> By this, I mean a system where the left and right eye images are *superimposed*
> (rather than flashed alternately) on each frame, each in a different color. The
> viewer resolves the image by viewing the screen through correspondingly colored
> (and very cheap) eye-glasses - similar to entertainment 3D movies.
>
> The questions are:
> - is this at all possible?
> - what are the software tools needed to put one together?
> - what are the resulting compromises in visual fidelity?
>

You can use two channels that are overlapped at the same location on the
screen/window.
They have separate drawcallback functions. You can use the accumulation
buffer of the visual to combine the images for the two eyes. The scene
should be made up of lighted geometry with white surface color and grey
textures. You can then use two lightsources, one for each eye, that have
the same position and orientation but have different colours. You select
the required light by means of traversal masks. Instead of the two
lights you can use the color table extensions to OpenGL. These
colortable usages can take some time because you have to do glDrawPixels
or glCopyPixels and they are time comsuming.

Mario

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