  We present an assistive system for clipart design by providing visual
scaffolds from the unseen viewpoints. Inspired by the artists' creation
process, our system constructs the visual scaffold by first synthesizing the
reference 3D shape of the input clipart and rendering it from the desired
viewpoint. The critical challenge of constructing this visual scaffold is to
generate a reference 3Dshape that matches the user's expectation in terms of
object sizing and positioning while preserving the geometric style of the input
clipart. To address this challenge, we propose a user-assisted curve extrusion
method to obtain the reference 3D shape.We render the synthesized reference 3D
shape with consistent style into the visual scaffold. By following the
generated visual scaffold, the users can efficiently design clipart with their
desired viewpoints. The user study conducted by an intuitive user interface and
our generated visual scaffold suggests that the users are able to design
clipart from different viewpoints while preserving the original geometric style
without losing its original shape.
