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Browse Prior Art Database

Ears Cubes for Object Control in Realtime 3D Graphics

IP.com Disclosure Number: IPCOM000100772D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Todd, SJ: AUTHOR

Abstract

Disclosed in this article is a device for controlling the rotation and panning of an object in a 3D, realtime graphics manipulative system. It is compatible with IBM 5080 display and similar products, such as CATIA and the UKSC ESME/WGS interactive systems.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Ears Cubes for Object Control in Realtime 3D Graphics

       Disclosed in this article is a device for controlling the
rotation and panning of an object in a 3D, realtime graphics
manipulative system.  It is compatible with IBM 5080 display and
similar products, such as CATIA and the UKSC ESME/WGS interactive
systems.

      Control of object rotation and panning in realtime 3d graphics
systems should be such that when a user performs a particular
movement, the object moves in a naturally corresponding manner
(so-called 'kinestheic correspondence').  This requires
special-purpose interaction hardware.  The dials widely used for IBM
5080 displays do permit interactive control of an object but their
layout does not permit kinesthetic correspondence.

      The basic solution consists of a cube, with dial on the front,
top, left and right faces: the so-called 'ears' cube. These are
programmed such that
-    turning the front dial rotates the object about the screen Z
axis,
-    turning the top dial rotates the object about the screen Y axis,
and
-    turning the left or right dial rotates the object about the
screen X axis.

      Left and right dials are required to allow for left- and
right-handed use.

      Variants Clutch:  When limited-rotation potentiometers are used
in the cube, it is necessary to be able to recentre them without
moving the object.  An on-off switch, which may be situated on the
box or elsewhere, acts as a clutch.
Rate Control:  It sometimes required to make large changes to the
orientation of an object, and it sometimes required to move it very
slowly.  Variable rate control may be achieved in one of two ways:
-    By an additional slider that controls the rate.  The absolute
position of the slider controls the gearing between the dia...