Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Wed, 4 Oct 1995 15:23:15 +0100
Angus Henderson recently uploaded some real-time distortion correction
software for a dome projector, it reads 3 rendered images from the
framebuffer into texture memory and textures them to polygon mesh to create
a single "fisheye" view in real-time. Because performance isn't an issue
you could try much higher resolutions than this demo uses.
ftp://sgigate.sgi.com/pub/Performer/RealityCentre/
>
> Two questions about that,
>
> 1. Is there some s/w capabilities to include the correction in the
> database traversal instead of just distort rendered image of the
> frame buffer ?
>
> 2. Will performer include these Features in the future ?
The shark demo in the same directory applies distortion to the geometry
in the scene graph but I suspect that this isn't what you mean.
In the general case distortion correction is best applied in the framebuffer,
you can only affect vertex information in the scene graph, not apply
non-linear edge rendering & shading. This means you must have lots of
vertices & polygons to allow reasonably smooth distortion if you only
distort your geometry. If you don't mind having to tesselate your geometry
and draw lots of polygons then look at the atlantis demo.
>
>
> Thanks,
>
> yves
>
>
>
> --
> =========================================
> = Yves DEMANGE M/S : IFR-342 =
> = Pre-sales engineer =
> = SGI France AIX-EN PROVENCE Office =
> = Parc club du golf, bat 20 =
> = Av. Guillibert de la Lauziere =
> = BP 107000 Aix-en-Provence cedex 3 =
> = FRANCE =
> = Tel : (33) 42 39 77 79 =
> = Fax : (33) 42 39 77 50 =
> = E-Mail : deum++at++aix.sgi.com VM 59361 =
> =========================================
>
>
>-- End of excerpt from Yves DEMANGE
-- Angus Dorbie, Silicon Graphics Ltd, UK dorbie++at++reading.sgi.com
This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:51:56 PDT