Re: Curved projections :
Michael Jones (mtj++at++babar)
Tue, 27 Jun 1995 07:50:58 -0700
On Jun 27, 2:32pm, Chris Seal wrote:
> Subject: Curved projections :
:cseal++at++sirapgc.demon.co.uk
:
:Hi,
:
:This isn't a specific Performer question - so apologies for the misuse - but
:you guys are probably the ones with the answer;
:
:I would like to render the scene onto a non-planar view/projection plane
:(which would probably be part of a sphere). This would be to compensate for
:curvature in some specialised wide field-of-view screens. The question is
:this an easy thing to do and what are the performance implications. If anyone
:can recommend a good book which deals specifically with 3D transformations in
:detail, I would be most interested in knowing about it.
:
:Many thanks
:Chris Seal.
:
>-- End of excerpt from Chris Seal
There are three solutions I know of:
1. place the projector lens at the viewer's eyepoint, then it won't matter.
2. use a projector that can correct for the distortion -- some can.
3. render image. copy frame buffer to texture memory. render new
image using this texture. you now have an inversely distorted
image that will look right when viewed.
--
Be seeing you, Phone:415.390.1455 Fax:415.965.2658 M/S:8U-590
Michael T. Jones Silicon Graphics, Advanced Graphics Division
mtj++at++sgi.com 2011 N. Shoreline Blvd., Mtn. View, CA 94039-7311
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on Mon Aug 10 1998 - 17:51:37 PDT