Headtracking with the screen (not HMD) as projection plane

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Daniela Rainer (rus3d++at++viserv.rus.uni-stuttgart.de)
Tue, 15 Oct 1996 17:29:21 +0000

This is not a Performer question, but perhaps someone can give me a hint:

What is the best projection for headtracking (with a ultrasonic or magnetic
tracker) with the workstation or other screen as projection plane?

I tried two ways:

1. Way

Off axis projection (asymmetric frustum) with the frustum defined by a near
plane parallel to the screen:

 .------------------------------. far
   . .
     . .
       ---------------------- screen
        . .
          . .
            . l r . l...left
              .------|---. near r...right
                . | .
                  . | .
                    .|.
                    eye = tracker position

The problem is, that objects are distorted.

2. Way:

With an on axis projection (symmetric frustum) the objects look ok but if you
move the head, it looks as they are moving.

Thanks for any answers
Regards
Daniela

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Daniela Rainer                       | email: rainer++at++rus.uni-stuttgart.de
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