From: owner-3dui@hitl.washington.edu on behalf of Ernst Kruijff
[kruijff@fossi.uni-weimar.de]
Sent: Monday, January 31, 2000 9:43 AM
To: Yanqing Wang
Cc: 3d-ui@hitl.washington.edu
Subject: Re: system control - techniques and guidelines


Hi All, 

Some more comments.... :-)


> >-Possibly constrain DOF's
> >   / Old guideline, basically coming from guidelines applicable to
> >   selection
> 
> Yes, especially the haptic constraints can help a lot in speed.
> The paper I'll present at chi2000 will address this issue --"The role of
> contextual haptic and visual constraints on object manipulatin in virtual
> environments".

Does someone happen to know a good article which handles with Fitt's law
in 3D?  The articles I read where all a bit vague with respect to this..
(also the Guiard paper at CHI99). 

Interesting also: Jacoby (I thought) names 3D as possible advantage for
affordance, of course this would weaken the guideline...  

> >-Make use of strengths of input and output devices for affordance
> > / match system control to characteristics of the devices you use - this
> > might be the most obvious in case of props.
> 
> 
> I am not sure which "characteristices" you refer to. Anyway, I feel that
> the physical or form factors of input device are very important,
> yet, under-studied.

A prop might be the best example - affordance is an obvious part here.
Though, it might go deeper- for example, when one uses some kind of
circular menu (like a ring menu) the way one uses the menu is also
depending on the input device. The way you can best rotate the ring is
depending on how you hold the input device, that is, how you can move your
wrist (or fingers). So, how fast and easy you move the selection box to a
menu item is depending on the way you move/rotate  your input device. 

Also, talking about output devices, the spatial reference of a responsive
workbench (strong table metaphor) is very good for placing system control
menus at the border. I think even Polyshop used this table metaphor for
placing and ordening menus, need to check that. 


I am Looking forward to more comments! I would especially be interested in
hearing some more on the categorization and my question on "the maximum
amount of elements" .... furthermore, the guidelines can't be that good
already that no one has experiences which completely weaken the proposed
guidelines :-)

Cheers,

    -Ernst    


                        ernst kruijff (M.A.)
             teaching and research scientist
____________________________________________
.................bauhaus-universitaet weimar
.....................faculty of architecture
chair caad and architecture [prof.dr.donath]
............................d - 99421 weimar

.............fon/fax: +49 (0)3643 584282 /02
.........email: kruijff@archit.uni-weimar.de
......url: http://www.uni-weimar.de/~kruijff

............................guest researcher
.........Virtual Environments Group (IMK.VE)
............................GMD St. Augustin