From: kph@cs.brown.edu (Kenneth P. Herndon)
Subject: Re: HARDWARE: More on Mirage HMD...
Date: Wed, 7 Apr 1993 16:30:28 GMT
Organization: Department of Computer Science, Brown University


In article <1ppj1lINN5if@shelley.u.washington.edu> jallin@acorn.co.uk (Jonathan Allin) writes:
   In article <1po70jINNq76@shelley.u.washington.edu> kph@cs.brown.edu
   (Kenneth P. Herndon) writes:

   >I know that
   >studies which compare the relative effectiveness of different depth
   >cues (shadows, projected lines, stereo optics, relative size of
   >objects, etc.)  have determined that stereo ranks lower on the
   >effectiveness scale than many other depth cues.  

   Do you have references that support this comment? I would be very
   keen to follow it up.

@PHDTHESIS{kilpatrick-kinesthetics,
	AUTHOR = {Paul Jerome Kilpatrick},
	TITLE = {The Use of a Kinesthetic Supplement in an Interactive
Graphics System},
	SCHOOL = UNC,
	YEAR = {1976},
	ABSTRACT = {
A mechanical robot arm is controlled by users via software and a six
degree-of-freedom input device to manipulate objects in a workspace.
A crt is used to provide users with an auxiliary visual display.
Various types of kinesthetic feedback are provided to aid the user's
perception.  Visual cues such as perspective projection, stereo
display, shadows and depth cueing are provided in the crt display.
The input device is equipped with mechanical force-feedback servo
motors to respond to physical contact with objects.  Part of this
thesis is devoted to a user-study of these various kinesthetic
feedback methods to determine which helped a user's perception and
which did not.
	}
}

Kilpatrick's user studies revealed that users prefered the drop
shadows over stereo for perceiving the relative depth of objects in
the scene.  The study was limited to a specific application, however,
and its results may not therefore be applicable to all potential
applications.  The display was in wireframe on a vector display.

   Very many thanks

   --Jonathan Allin, Acorn Computers Ltd, Cambridge, England

-ken 
--
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ken herndon    kph@cs.brown.edu          uunet!brunix!kph
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