[info-performer] off-axis frustum for TAN Holobench

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From: Rory (jhs0rcjb++at++leeds.ac.uk)
Date: 03/08/2004 08:21:28

Hi there,
I am new to Performer, and am trying to implement an off-axis frustum. I am
initially doing this on the desktop, but it will later be used on the TAN
Holobench, and so will require head-tracking.

At the moment I have an on-axis frustum, which I have done using a pfChannel as
follows:

 chan = new pfChannel( pipe );
 chan->setViewport( 0.0, 1.0, 0.0, 1.0 );
  xyz.set( xx, yy, zz );
  hpr.set( heading, pitch, roll );
  chan->setFOV( 48.0, 0.0 );
  chan->setNearFar(1.0f,1000.0f);
  chan->setView( xyz, hpr );
  chan->setScene( scene );
  chan->setTravFunc( PFTRAV_DRAW, DrawChannel );

When moving left or right (on the desktop), setView is called again to update
the position.

So for an off-axis frustum should I use the chan and the makePersp function, or
should I use a pfFrustum and its makePersp(and if so, how do you put this into
the pipe?)?

Thanks for any help,
Rory

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