Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How2Sketch: Generating Easy-To-Follow Tutorials for Sketching 3D Objects   Accurately drawing 3D objects is difficult for untrained individuals, as it
requires an understanding of perspective and its effects on geometry and
proportions. Step-by-step tutorials break the complex task of sketching an
entire object down into easy-to-follow steps that even a novice can follow.
However, creating such tutorials requires expert knowledge and is a
time-consuming task. As a result, the availability of tutorials for a given
object or viewpoint is limited. How2Sketch addresses this problem by
automatically generating easy-to-follow tutorials for arbitrary 3D objects.
Given a segmented 3D model and a camera viewpoint,it computes a sequence of
steps for constructing a drawing scaffold comprised of geometric primitives,
which helps the user draw the final contours in correct perspective and
proportion. To make the drawing scaffold easy to construct, the algorithm
solves for an ordering among the scaffolding primitives and explicitly makes
small geometric modifications to the size and location of the object parts to
simplify relative positioning. Technically, we formulate this scaffold
construction as a single selection problem that simultaneously solves for the
ordering and geometric changes of the primitives. We demonstrate our algorithm
for generating tutorials on a variety of man-made objects and evaluate how
easily the tutorials can be followed with a user study.

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The categories of this paper are: hep-ex
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: math
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th