Stereo Split Sceen in O
Evans P.R.
pre at al.mrc-lmb.cam.ac.uk
Mon Aug 15 02:51:30 EST 1994
In article <32gpkl$jj5 at columba.udac.uu.se> gerard at rigel.bmc.uu.se (Gerard Kleijwegt) writes:
|>
|> The classic way of getting L/R stereo pairs for publication is to set up the
|> picture you want, full screen, mono for the (eg) left image, take a
|> picture, then rotate the picture 6 degrees (or approx), and take a
|> picture for the right image. The reason for doing this is that you lose
|> half the screen resolution in _all_ stereo modes (even on the ESV with its
|> fantastic anti-aliasing). Consequently, if you do it the way I suggest,
|> the final printed images will be better, even though it means you have to
|> fiddle & stick two half-images together.
|>
|> Of course, in the good old PS390 FRODO 6.6 days, there was a toggle that
|> switched between full-screen stereo, split stereo, left image and right
|> image. That way, it was dead simple to do what I am describing. Isn't it
|> amazing what advances in software & hardware can bring you?
|>
|> Adrian
|>
|> --
in the SGI version of O, this is controlled by the
F-keys
in *all* versions of O, however, you can use the
Rotate_obj command:
(make your picture; take a photo)
O > rot_obj ;;
(now you have the other one; take a photo)
--gerard
Note that you should not really do stereo with a y rotation, but with a
shearing operation which changes the screen x but not z. If you use a
rotation, you get different bits clipped by front & back clipping planes
(slab) in the L & R eye view which confuses the eye. A suitable stereo
operation is
( 1.0 0.0 +-0.05 ) ( x )
( 0.0 1.0 0.0 ) ( y )
( 0.0 0.0 1.0 ) ( z )
In O, stereo is correctly implemented on ESV, but wrongly on SGI
Phil
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Smail: Phil Evans
MRC Laboratory of Molecular Biology, Hills Road,
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Phone: +44-(223)-402211 Fax: +44-(223)-213556
Email: pre at mrc-lmb.cam.ac.uk
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Smail: Phil Evans
MRC Laboratory of Molecular Biology, Hills Road,
Cambridge, CB2 2QH, UK
Phone: +44-(223)-402211 Fax: +44-(223)-213556
Email: pre at mrc-lmb.cam.ac.uk
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