Angus Dorbie (dorbie++at++sgi.com)
Mon, 19 Jul 1999 23:56:27 -0700
With spherical screens of the type under consideration my presentation
is intended to show that a multi-channel curved display is approximated
by multiple channels which treat the screen as a faceted display in the
I.G. with modelview 'heading offsets'. These are then projected onto the
screen and some correction applied in the projectors to eliminate the
distortion introduced by the projection onto the curved screen. During
this correction alignment you will typically lose some of the image of
the top and bottom center of each channel because a frustum channel
subtends a larger vertical fov at the center than at the edge because of
flat geometry whereas a cylindrical screen has constant vertical fov. A
test pattern in the IG and some form of reference on the display is
essential to correctly perform this alignment.
Cheers,Angus.
Lei Lixing wrote:
>
> Hi Angus,
> I have download your paper about "Matching Projection Geometry
> to Display Geometry" from www.sgi.com/software/performer/presentations
> /geometry/index.htm.To get multi-channel spherical projection displays,
> I try to modify modelVIEW in IRIS GL according to your hint,unlucky,
> the result is disappointing.Would you tell me more info. or where to
> find out more info.
> I want to generate large FOV (>160 degree) through 3 channels
> projection in flight simulator .I am working on Onyx/RE2 under
> IRIX 6.2/performer 2.2.
>
> Thanks and have a nice day.
>
> Lei Lixing
> e-mail: flysiml++at++public.bta.net.cn
>
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--
Never express yourself more clearly than you think.
Neils Bohr
For advanced 3D graphics Performer + OpenGL based examples and tutors:
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