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We introduce ScaffoldSketch,  

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a system that makes it possible 
to draw accurate 3D models in VR.

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Designers want to draw in VR, but it's really 
hard to be accurate, even with a lot of training.

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So how do they draw accurately in 2D?

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When industry designers draw with pen and paper, 

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they first draw construction lines, 
also known as scaffolds,

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then they draw the object 
shape on top of the scaffolds.

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The scaffolds serve as visual guidance 
to make the shape strokes accurate.

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This is how an industrial designer 
can draw accurate trash can.

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Can this approach directly transfer to VR?

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Even with the help of scaffolds, 
people still cannot draw accurately.

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This is due to depth perception and 
the extra spatial degree of freedom.

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See our paper for a controlled experiment.

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If we could eliminate these errors we would 
have a nice way to draw product sketches in VR.

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We introduced ScaffoldSketch.

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It allows designers to draw accurately in VR  

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by auto-correcting errors with 
scaffolds and stroke strokes.

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The scaffold lines snap to each other based 
on endpoints, directions, and lengths.

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We also support tick on the scaffold 
lines to mark intermediate positions  

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as designers often do with pen and paper.

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The shape strokes are auto-corrected based 
on the scaffolds and the user's drawing  

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just like how the scaffolds 
support the shape strokes in 2D.

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With the same scaffold square, different user 
input will be auto-corrected to different results.

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Shape auto-correct has 2 goals: be guided by 
the scaffolds, and be as beautiful as possible.

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We also support space curves

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And with more tick marks the auto-correct 
result will also be different

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This is the trash can drawing in VR.

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Drawing with scaffold sketch is very similar 
to the pen and paper drawing process.

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Users first draw scaffolds and 
then draw shape strokes on top.

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ScaffoldSketch lets designers directly 
transfer their 2D drawing skills to VR,  

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and create aesthetic and accurate 3D drawings.

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The user can hide the scaffolds 
to get a better view of the shape,  

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and, of course, export their drawing and 
continue the industrial design process.

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Here are more ScaffoldSketch examples:  

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some from the experienced user and 
some from our user study results

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We conducted a user study 
with industrial designers,  

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they all expressed that they want 
to use ScaffoldSketch in the future.

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For more, please read our paper, thank you.