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Accurately drawing 3D objects is difficult for untrained individuals, as itrequires an understanding of perspective and its effects on geometry andproportions. Step-by-step tutorials break the complex task of sketching anentire object down into easy-to-follow steps that even a novice can follow.However, creating such tutorials requires expert knowledge and is atime-consuming task. As a result, the availability of tutorials for a givenobject or viewpoint is limited. How2Sketch addresses this problem byautomatically generating easy-to-follow tutorials for arbitrary 3D objects.Given a segmented 3D model and a camera viewpoint,it computes a sequence ofsteps for constructing a drawing scaffold comprised of geometric primitives,which helps the user draw the final contours in correct perspective andproportion. To make the drawing scaffold easy to construct, the algorithmsolves for an ordering among the scaffolding primitives and explicitly makessmall geometric modifications to the size and location of the object parts tosimplify relative positioning. Technically, we formulate this scaffoldconstruction as a single selection problem that simultaneously solves for theordering and geometric changes of the primitives. We demonstrate our algorithmfor generating tutorials on a variety of man-made objects and evaluate howeasily the tutorials can be followed with a user study.

How2Sketch: Generating Easy-To-Follow Tutorials for Sketching 3D Objects