CSE 165: 3D User Interaction. Lecture #6: Selection Part 2

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1 CSE 165: 3D Use Inteaction Lectue #6: Selection Pat 2

2 2 Announcements Poject 1 due this Fiday at 2pm Gading in VR lab B :30pm Two goups: even hous stat at 2pm odd hous at 3pm Homewok submission: Due tomoow at 2pm Need to upload scipts and assets to pivate Git epositoy Add use: cse165 to you epo as a collaboato Copy and paste you epositoy in the comment section when you ae submitting you scipt to TitonEd

3 3 Video Pesentations Zhiyao Yan EEG based BCI Navigation in VR MindMaze MindLeap VR Demo Alvin Ho Da vinci obot sugey Ran Tao Google Eath VR utu.be&t=5m35s Ka Chan Nathan Nguyen Rstyle 3D: VR fo Real Estate Sales and Achitectue (Demo v1.8) VR Exteme Multiplaye Climbing - Climbey

4 4 Ray-Casting Use points at objects with vitual ay Ray defines and visualizes pointing diection Fist intesected object is selected p( α) = h + α p h = 3D position of vitual hand p = ay attached to h 0 < α < detemined by fist object intesection

5 5 Two-Handed Pointing Ray casting with 2 hands Moe contol Distance between hands contols length Allows pointing at things behind othe things p( α) = hl + α ( h hl ) 0 < α < is fixed hl = 3D position of left hand h = 3D position of ight hand

6 6 Flashlight Does not need pecision Conic selection volume Tip of cone in wand Cone diection detemined by wand diection Fixed cone size If multiple objects in cone Object close to cente line of cone is selected If multiple objects ae equally close to cente line: select object close to device

7 7 Vitual Hand o Select and manipulate diectly with hand o Hand epesented as 3D cuso o Intesection between cuso and object indicates selection p v = α p, R v = R p, R = position and oientation of eal hand p v, R v = position and oientation of hand in VE α = fixed scaling facto

8 8 Go-Go By Ivan Poupyev, 1996 Am-extension technique Touch objects to select, like simple vitual hand Non-linea mapping between physical and vitual hand position Requies toso position v Local and distant egions v whee = length of R = length of R D, α ae constants if if D D = v F= ( F )( = ) = α+ ( α( D ) Dothewise ) whee = length of R v = length of R v D, α ae constants v

9 9 Wold-in-Miniatue (WIM) By Stoakley, 1995 Dollhouse wold held in use s hand Miniatue objects can be manipulated diectly Moving miniatue objects affects full-scale objects Can also be used fo navigation

10 10 Image Plane Techniques Requie only 2 DOF Selection based on 2D pojections Use vitual image plane in font of use Dependent on head/eye position Faming Lifting Palms Head- Cushe Sticky Finge

11 11 Scaled-Wold Gab By Mine et al., 1997 Often used with occlusion At selection, scale wold down so that vitual hand touches selected object Use initially does not notice a change in the image, until head o hand is moved

12 12 Foced Pespective Museum of Simulation Technology

13 13 Voodoo Dolls Piece et al Two-handed technique Builds upon image plane and WIM techniques Developed fo pinch gloves Requies finge pose tacking Ceates copies of objects (dolls) fo manipulation Non-dominant hand: stationay fame of efeence Dominant hand: defines position and oientation

14 14 Selection by Dwell Time Use points at object with any technique Vitual pointe Eye gaze Action is tiggeed afte dwell time theshold is exceeded Woks without physical buttons Fequently used in contolle-less VR: Google Cadboad, Samsung Gea VR

15 15 3D UI With the Leap Selection Hove w/timeout (dwell) Tigge with non-dominant hand gestue Two finge nea-pinch Manipulation Hand oientation 3-finge oientation 2-finge oientation (2 DOF)

16 16 Geneal Tips fo the Leap Finge pinches had to detect Moe than 3 finges had to distinguish Finges had to distinguish when hand not viewed well fom head Hand detection (left/ight): need to caefully bing hands into FOV fom bottom edge

CSE 165: 3D User Interaction

CSE 165: 3D User Interaction CSE 165: 3D Use Inteaction Lectue #6: Selection Instucto: Jugen Schulze, Ph.D. 2 Announcements Homewok Assignment #2 Due Fiday, Januay 23 d at 1:00pm 3 4 Selection and Manipulation 5 Why ae Selection and