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Joe Stewart (jstewart1++at++gwsmtp01.mdc.com)
Mon, 13 Nov 1995 15:31:38 -0600

Help!
      
    
   I'm trying to do off-axis perspective correction using
   two channels with one channel offset from the other as
   follows:

      /* channel one offset from channel zero */

      pfSetVec3(xyzOffsets, 0.0f, 0.0f, 0.0f);
      pfSetVec3(hprOffsets, -72.0, 0.0, 90.0);
      pfChanViewOffsets(Chan[1], xyzOffsets, hprOffsets);

   I am using the following code to create the perspective
   frustum:

      pfChanAutoAspect(chan, PFFRUST_CALC_NONE);
      pfFrustNearFar(chan, 1.0, 5000.0);
      pfMakePerspFrust(Chan[1],
        pfTan(hfov_l),pfTan(hfov_r),pfTan(vfov_d),pfTan(vfov_u));
      pfChanView(chan, ViewState->initView.xyz, ViewState->initView.hpr);
  
   When changing the vertical FOV (eg. vfov_d += delta
                                       vfov_u += delta),
   part of the scene gets clipped. The problem only seems to occur
   when channel one is rotated with respect to channel zero.

   I am running Performer 1.2 and I am assuming this to be a
   Performer limitation.

   Does anyone know a fix for this or how to turn the clipping off.

   (NOTE: I am not trying to do stereo. The rotation is done to
          increase the vertical FOV).

Thanks for any input

jstewart1++at++gwsmtp01.mdc.com
    

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