Date: Fri, 27 Sep 2002 11:02:59 -0500 From: "Pablo Figueroa" Subject: Re: 0GNav Sender: To: <3d-ui@hitl.washington.edu> Reply-to: "Pablo Figueroa" Message-id: MIME-version: 1.0 X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Importance: Normal X-MSMail-Priority: Normal X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 X-Authentication-warning: torch.hitl.washington.edu: majordom set sender toowner-3dui@hitl.washington.edu using -f X-Priority: 3 (Normal) Hi! A comment and a question follows... On Thu, 19 Sep 2002, Rob King wrote: > Chad, > As you point out, there are a *lot* of issues. > .. > So, what do you think? One- or two-handed? Free-space or fixed > devices? It is interesting that you mention an option, since usually what I've seen is that people try to accomodate to what they have available... I personally think that you can come up with a faster and more intuitive interaction technique with a two-handed, free space-based interface, than with fixed ones... However, it might be more difficult to construct and program... I haven't seen interaction techniques that use this, but a first draft might be an interface that uses the position of the two trackers to define linear velocity, and also angular velocity with a button attached to the non-dominant hand tracker. > On the psychological front, there are a host of issues in sensation, > perception and cognition that are at the heart of this. For example, it > has been shown that humans are by and largely incapable of mentally > conceptualizing the optimal path that rotates an object from one > orientation to another, unless that path coincides with a natural axis. > A natural axis is one that is a) vertical, b) horizontal, or c) in the > direction that the user is looking. The consequence is that users tend > to use a sequence of natural axis rotations (sort-of like thinking in > Euler angles instead of quaternions). Could you please give me a reference to such results? They are interesting for a study I'm developing... Best Regards, ------------------------------------------- Pablo Figueroa pfiguero@cs.ualberta.ca PhD Student http://www.cs.ualberta.ca/~pfiguero University of Alberta Relax ... God is in charge