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From: sundar@ai.mit.edu (Sundar Narasimhan)
Newsgroups: comp.windows.x
Subject: Re: 3d rotation in room coords?
Message-ID: <13825@life.ai.mit.edu>
Date: 7 Mar 91 23:27:23 GMT
References: <9103050342.AA20065@maui.coral.com> <13709@life.ai.mit.edu> <13781@life.ai.mit.edu> <1991Mar7.055600.4149@ux1.cso.uiuc.edu> <9314@exodus.Eng.Sun.COM> <9103072008.AA03949@enuxha.eas.asu.edu>
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|>
|>     When mapping mouse movement to the latitude and longitude of the eye
|> point, the relationship of mouse movement to rotation angle is linear.
|> This is not true for the virtual sphere device, where moving the cursor
|> near the borders of the sphere projection produces greater rotation
|> changes than moving the cursor near the center of the sphere face.
|> Steve Hollasch                /      Arizona State University (Tempe, Arizona)
|> hollasch@enuxha.eas.asu.edu  /  uunet!mimsy!oddjob!noao!asuvax!enuxha!hollasch

Ah yes.. Now I see. Introducing a sine (or a cosine) in the mapping 
between mouse to viewpoint co-ordinates clearly constitutes a
non-trivial extension that deserves a patent. Give me a break!

(BTW, this is exactly what I did in another program of mine).