Albert Herman (aherman++at++pike.cecer.army.mil)
Wed, 4 Jan 1995 21:23:49 -0600 (CST)
I'm currently working on a flight simulator for UAV's and am using
quaterions (and the associated differential equations) to model the
attitude motion of a particular vehicle. I'm interested in using
the quaternion functions upcoming in Performer if applicable. Currently,
I compute a direction cosine matrix (which represents the orientation
of a vehicle) in the UAV model. This matrix can be used to provide
Performer with the viewport direction. I'm interested in any information/
documentation about using quaternions with Performer that might be
available.
Also,
> Thanks, Allan. If you're a quaternion fan, you'll note that most of the
> functions implemented are taken directly from the various publications
> of the Reigning Quaternion God, Ken Shoemake.
is there a recent reference of Mr. Shoemake's that I could use as a pointer
to his work?
> These are all implemented as macros as well as functions, and the
> compiler seems to optimize the code for the complicated operators
> very efficiently.
Are these implementations documented somewhere that I can gain access to?
> If you've seen the Walt Disney Imagineering Labs "Aladdin Attraction" at
> EPCOT Center or at SIGGRAPH 1994, then you saw IRIS Performer
> quaternions in action. They're used to extrapolate the viewer's head
> position forward in time to minimize perceived latency, as explained
> in SIGGRAPH Technical Course #14.
Is this technical course available somewhere?
Albert.
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