week 12 summaries
Exploring 3D Navigation: Combining Speed-coupled Flying with Orbiting
This paper deals with the different navigation techniques which allow the user to see different view of the scene and interact with the environment.
They built a taxonomy to categorized the different navigation techniques and expand the structure to design new navigation techniques.
This taxonomy is divided into task selection, travel control and user interface.
The 3 subtasks are exposed inspection, search and exploration.
During the inspection, the object manipulation technique allow the user to drag and manipulate a copy of an objet while the ghost copy technique allow to manipulate multiple copies of an object to get multiple simultaneous viewpoints.
During the search, the Inverse Fog/Scaling techniques diminish the occlusion by scaling down and make the object more or less transparent depending on the distance to them, the ephemeral world compression allow the user to scale the world to have a better view on the different objects.
To quickly explore the environment a technique has been developed to click on an object and directly get the point of view from it. The possession navigation technique permit to move while holding an object.
The Speed-coupled Flying techniques couple speed control to height and tilt control to allow the user to perform the 3 subtasks more effectively. This technique can be coupled with an orbiting to switch to an environmental state navigation. The authors provide 2 experiments to test Speed-couple Flying with Orbiting technique. The results show us that this technique allow the user to navigate more efficiently and that the new prototype large screen display developed by the authors improve the navigation tasks experience.
A survey design issues in Spatial Input
This paper try to synthesize all the design issues encountered when creating spatial input and provide a common framework as a series of design issues.
The design issues presented here are divide into 2 main categories, human perception and ergonomic concerns.
People do not innately understand 3 dimensional reality, but rather they experience it.
To perform a task a user need what we call a spatial reference to refer to.
A two hand interaction can also allow the users to ground themselves in the space and avoid desorientation.
We can use multisensory feedback like the touch to help users to locate object and interact with them. Physical constraints give to the user the physical properties of the objects and head tracking can give back the information lost by the displaying the 3D objects.
The authors identifies 4 control metaphors for 3D interaction, Eyeball-in-hand, Scene-in-hand, Flying vehicle and Ray casting.
There is some issues in dynamic target acquisition tasks like use of transparency, Ray casting vs direct positioning in 3D and Cone casting vs ray casting.
Other issues like Recalibration mechanisms, Dynamics and size of the working volume of the user’s hands and clutching mechanisms are explain
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