We introduce ScaffoldSketch,
a system that makes it possible to draw accurate 3D models in VR.
Designers want to draw in VR, but it's really hard to be accurate, even with a lot of training.
So how do they draw accurately in 2D?
When industry designers draw with pen and paper,
they first draw construction lines, also known as scaffolds,
then they draw the object shape on top of the scaffolds.
The scaffolds serve as visual guidance to make the shape strokes accurate.
This is how an industrial designer can draw accurate trash can.
Can this approach directly transfer to VR?
Even with the help of scaffolds, people still cannot draw accurately.
This is due to depth perception and the extra spatial degree of freedom.
See our paper for a controlled experiment.
If we could eliminate these errors we would have a nice way to draw product sketches in VR.
We introduced ScaffoldSketch.
It allows designers to draw accurately in VR
by auto-correcting errors with scaffolds and stroke strokes.
The scaffold lines snap to each other based on endpoints, directions, and lengths.
We also support tick on the scaffold lines to mark intermediate positions
as designers often do with pen and paper.
The shape strokes are auto-corrected based on the scaffolds and the user's drawing
just like how the scaffolds support the shape strokes in 2D.
With the same scaffold square, different user input will be auto-corrected to different results.
Shape auto-correct has 2 goals: be guided by the scaffolds, and be as beautiful as possible.
We also support space curves
And with more tick marks the auto-correct result will also be different
This is the trash can drawing in VR.
Drawing with scaffold sketch is very similar to the pen and paper drawing process.
Users first draw scaffolds and then draw shape strokes on top.
ScaffoldSketch lets designers directly transfer their 2D drawing skills to VR,
and create aesthetic and accurate 3D drawings.
The user can hide the scaffolds to get a better view of the shape,
and, of course, export their drawing and continue the industrial design process.
Here are more ScaffoldSketch examples:
some from the experienced user and some from our user study results
We conducted a user study with industrial designers,
they all expressed that they want to use ScaffoldSketch in the future.
For more, please read our paper, thank you.