Re: 3 Screen View

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Tom Fuke (tom++at++war.reading.sgi.com)
Wed, 21 Jun 1995 20:42:54 +0100

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On Jan 31, 15:43, Bryan Croft wrote:
> Subject: 3 Screen View
...
> We have a 3-pipe onyx whose graphics is displayed onto three screens.
One
> pipe per screen for the view into the 3D world. The left, center and
right
> screens are each 45 degree field of view. This allows for a 135 degree
> field of view in all. Now for the problem. We have rotated the left
and
> right screens in 45 degrees. This looks fine until you tilt up or
down.
> The right and left screens horizon tilts down or up respectivly.

This is what you would expect surely, looking out the side windows of your
vehicle with separate perspective projections.

> We think we need to offset the x,y,z position
> as well.

Is the geometry of your display system based around a single eyepoint?
Translating the channel offsets in XYZ implies more than one eyepoint.

tom

---

P.S.  Here at the SGI UK RealityCentre we have a SEOS display system
(Prodas), which maps the three separate (rectangular) perspective channel
views onto a spherical screen. The channels are distortion-corrected and
edge-blended.

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