a)   Unistroke: A Method for 3D Object Annotation

b)   情報科学研究科・D3Katzakis Nikolaos

c)    Inria Bordeaux Sud-Ouest, France

d)   From September to December 2014 I visited the Inria research center in Bordeaux for 3 months. Working in France gave me a new perspective on working more efficiently, and helped me understand the importance of maintaining a good work-life balance.


From September to December 2014 I spent three months in Bordeaux, working in Inria Bordeaux Sud-Ouest. The Inria building is located inside the campus of the University of Bordeaux, in Talence.


Description: Macintosh HD:private:var:folders:_g:vys3c7zj7dl1xyt573b7ckmm0000gn:T:TemporaryItems:Inria_building.jpg


I was part of the potioc project team that does research on user interfaces, interaction and augmented reality.


Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:IMG_20141017_154501.jpg


Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:disconnect.pngThe project I undertook involved developing a novel method for facilitating drawing on 3D objects with fewer explicit mode changes or viewpoint manipulations. Direct drawing on 3D objects is a challenging task. When a user wishes to draw straight, long curves on a 3D object it is often necessary to manipulate the viewpoint and then continue the stroke. However, because of the nature of stylus input devices or touch input, that often creates a disconnect at the point where the stroke was resumed. In an attempt to avoid this disconnect  from occurring we propose unistroke, a novel technique that allows users to  make continuous long strokes.


Our proposed system works as follows: When the stylus pen (or touch point) reaches a point where it’s no longer drawing on the object, the system switches to rotation mode. This occurs in three different ways.


When the input point exits the object.


When there is an abrupt change in the directions of the face normal.

When there is a gap in the geometry.

Description: intersection-edge.png

Description: intersection-sharp-angle.png

Description: intersection-gap.png



We implemented a prototype version of the system on a Wacom cintiq tablet and ran a user study, comparing our interface with the state of the art in 3D drawing, ACCD by Ortega et al. [ACM CHI 2014].



Description: bunny.png


Users had to trace objects on a 3D teapot. Our pilot evaluation indicates that our proposed interface was preferred by the users overall and is more accurate than the state of the art, although marginally. It should be noted that although the differences in accuracy were statistically significant the Y axis on the Distance chart is in cm, so both interfaces performed very accurately.



Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:Screen Shot 2015-01-15 at 7.50.20 AM.png

Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:Screen Shot 2015-01-15 at 7.50.26 AM.png

Subjective ratings (easy to use)

Distance from Traced Image


Life in France

Bordeaux is a very beautiful, vibrant city with lots of things to do.


Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:IMG_20140906_181636.jpg



France has lots of delicious Bread, wine and cheese.

Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:IMG_20140906_115424.jpg


I also visited the nearby Saint-Emilion region and toured the old town and the vineyards.

Description: Macintosh HD:Users:jubei:Google Drive:sync:Desktop:IMG_20140913_110235.jpg

I was especially impressed by the French people’s nearly religious insistence on maintaining a good life-work balance. Lots of breaks during work, a long lunch break and many holidays (staff at Inria get 7 weeks of holidays a year). I found work in Inria to be efficient and focused. I would love to return to France for work someday.