Sketch 3D a three dimensional painting / sculpting tool ! ! ! 3DUI Project Martin Schanzenbach, Felix Kaser, Daniel Bader 1 

The original idea A marker defines an editing volume 2 

The original idea Use a tracked pen to place “3D pixels” in the editing volume 3 

The original idea Move the camera to freely explore the object you just painted 4 

Improvements Editing volume restricting the painting area not helpful for users ! Interpolation to smooth out drawing movements fill out gaps when moving quickly better visual results 5 

Improvements II The ground marker can be moved freely ! A MacGyver-style pen device 6 

Usability testing: The setup Testers were asked to recreate simple shapes: 7 

Usability testing: The setup II Positions of the screen and the camera were changed Camera: above vs. facing user vs. on the shoulder Screen: in front of user vs. completely hidden ! Tester performance was rated based on duration and precision 8 

Usability testing: The results Tester performance was best when the screen was hidden initially (for the first tries) and the camera was placed “over the shoulder” ! Testers found it easiest to control their hand motion when the screen worked like a mirror e.g. moving your hand to the right translates to a movement to the right on screen 9 

Usability testing: The results II It was difficult for testers to keep the marker visible to the camera ! Testers had problems navigating back to positions in space Possible solutions: add a cursor, add shadows 10 

Usability testing: Impressions 11 

Usability testing: Impressions 12 

Usability testing: Impressions It is possible to paint something nice... :-) 13 

Fun ideas 14 Place the ground marker on a rotary disk... Virtual pottery! 

Demo 15 

Questions 16 Checkout the project at github.com/kaserf/Sketch-3d ! Thanks for your attention!