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Angus Dorbie (dorbie++at++sgi.com)
Thu, 20 Aug 1998 10:16:59 -0700

chuan tian wrote:
>
> hi,Performer expert!
> I used to use Performer 2.0 to develop application, now
> I encounter
> a problem,I want to project my picture on the dome screen,
> since its original image rendered by Performer is flat,so
> there is distortion when I project the flat image on the
> dome screen.also there are many other problems.Can someone
> tell me how I should do?

You need what is commonly called "distortion correction",
This involves applying the suitable non linear distortion
to the rendered image. On an SGI system this is done by
reading the framebuffer back to texture memory and applying
this texture to a warped mesh of polygons for the remapping.

I have a C++ class which computes the required scene graph
for the distortion required with any dome, design eyepoint
and any projector combination. I also have a demonsration
application which uses this with image readback from the
framebuffer.

What is your display surface geometry, field of view and
projection system?

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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