Moving eyepoint vs. DCS translations

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Sam Watters (watters++at++minneapolis.sgi.com)
Tue, 31 Dec 1996 14:17:54 -0800

The pfi Trackball that is included with Performer is a nice
tool for mapping 2D screen motion to a trackball model. The
rotation/translation matrix produced by the tool works great
when you apply that matrix to the DCS node for a scene graph.

But, what if you want the user's eyepoint to move instead of
the DCS? Anybody figured out how to use the trackball and
get that effect. I want to have two channels viewing the same
database, and if the trackball matrix manipulates the DCS for the
model it will make the rotations/translations occur in both
views. If I move the eyepoint that won't be a problem. I could
also use shared instancing, but moving the eyepoint still seems
to be the "elegant" solution. Suggestions/solutions would be
much appreciated.

-- 
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 Sam Watters                     | phone: 612-893-3611
 Technical Consultant            | vmail: 633-3611
 Silicon Graphics, Inc.          | email: watters++at++minneapolis.sgi.com
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 Bloomington, MN  55437          |
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