VIEWS: 1 PAGES: 12 POSTED ON: 2/24/2012
Deformable Ray-Casting Interaction Technique YVR 2005 Pohang – 02/25/2005 Ludovic Sternberger directed by Pr. D. Bechmann Presentation Outline Introduction – Research interests – Previous works – Pros and cons on virtual pointer techniques – Hopped characteristics for the deformable ray-cast The deformable ray-casting metaphor – Overview – Selection – Navigation Future works Introduction Research Interests – Environment : Workbench, Data Gloves – Goals simple metaphors, natural & intuitive interaction techniques, using gestures, speak recognition, … test them on real life applications (3D Geometric Constructions, Surgery Training) propose a good framework to easily develop 3D UI – A first new metaphor : The Deformable Ray-Cast Introduction Existing Interaction Techniques – Egocentric Virtual Hand (simple, Go-Go and extensions) Virtual Pointers (classical, raycasting, spotlight, aperture-based) Image-plane based (framing hands, head crusher, sticky finger) – Exocentric WIM Voodoo Dolls Introduction Pros and Cons on virtual pointers – PROS Fast selections Very simple – CONS Ambiguity problems when objects are close to each other Object of interest occluded by another Too small and too far objects Introduction Hopped characteristics for the deformable ray-cast – Easy selection of occluded objects by going around obstacles – Both single or multiple selection – Precise ray-casting technique, both on near and far objects – It reduces the need for disambiguation when two or more objects are close to each other – It provides constraint navigation along any curve – It provides planned navigation – Selection and navigation can be achieved in the mean task The deformable ray-cast Overview – The ray is composed with pieces of curve – Manipulation with 2 hands (natural and intuitive) – 2 hands = 1 vector Length = speed of the ray Direction = orientation of the ray – 2 gestures / 3 modes Moving backward Moving forward Dead zone The deformable ray-cast Selection – B-Spline with n control points regularly spaced out – The user controls the last part of the curve Expand the set of objects to which the user can point Reduce the need of disambiguation on objects which are close to each other Reduce obstructed objects misselected – The ray can pass through several objects Multiple selection The deformable ray-cast Navigation – Draw a 3D path for planned navigation Play Rewind … – Provide an equivalent to the cinema’s traveling technique to move the camera Ex : view inside a body during a virtual surgery operation Applications in 3D Geometric Constructions – Selection based on 3D layers – Planned navigation to provide a better understanding of 3D constructions in Medical Surgery – Navigation inside blood vessels Future Improve the metaphor by adding more visual clues inside the scene : shadows, specific colors, sounds, … Add a second point of view (camera) at the end of the ray, displayed in miniature Use the deformable ray-cast for manipulation : constrained manipulation along the curve. Questions ?? ? ? ? ?
Pages to are hidden for
"Deformable Ray-Casting Interaction Technique"Please download to view full document