Week 12 summaries

Exploring 3D Navigation: Combining Speed-coupled Flying with Orbiting

The authors start the paper with developing their taxonomy for navigation technology. The current taxonomy is divided into three groups, Task Selection, Travel Control, and User Interface. The authors give definitions for terms in each group. The authors then provide four different AR navigation techniques.

First technique is Object Manipulation and Ghost Copy. The user drags on an object and manipulates a copy of object in Object Manipulation. When user releases the button the camera moves to the location. In Ghost Copy, the user selects an object and can manipulate multiple copy of object so that the user can view multiple viewpoints. The second technique is Inverse Fog/ Scaling and Ephemeral World Compression. In the Inverse Fog/ Scaling, the user controls a circle around the user and objects are faded. In Ephemeral World Compression, the user is able to scale the world. The third technique is Possession and Rubberneck Navigation. The user sees through the viewpoint of an object and able to manipulate with regard to the viewpoint of a selected object. The fourth technique is Speed-coupled Flying with Orbit. The user is moving with the height coupled with the speed of movement and through the orbit around the selected object.

The authors provide two user studies and the user studies show that the users performed better with the system equipped with Speed-coupled Flying with Orbit technique and larger screen.

A Survey of Design Issues in Spatial Input

The paper presents the survey of issues that occurs in designing of 3D interactions. The authors divided the techniques into two large categories: Human Perception and Ergonomic concerns. The human perception issues are spatial references, relative vs. absolute input dimension, two-handed interaction, multisensory feedback, physical constraints, control metaphors, and head tracking technique. The ergonomic concerns include dealing with coarse and fine positioning information, understanding of dynamics and structure of user’s hand, affordance of multi-modal input, clutching mechanisms, and usage of mice and keyboard with free-space input. These issues are mostly related to spatial inputs

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