SBM15: Sketch Based Interfaces and Modeling 2015

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https://diglib.eg.org/handle/10.2312/12610

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Browsing SBM15: Sketch Based Interfaces and Modeling 2015 by Subject "I.3.6 [Computer Graphics]"

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    Adding Dynamics to Sketch-based Character Animations
    (The Eurographics Association, 2015) Guay, Martin; Ronfard, Rémi; Gleicher, Michael; Cani, Marie-Paule; Ergun Akleman
    Cartoonists and animators often use lines of action to emphasize dynamics in character poses. In this paper, we propose a physically-based model to simulate the line of action's motion, leading to rich motion from simple drawings. Our proposed method is decomposed into three steps. Based on user-provided strokes, we forward simulate 2D elastic motion. To ensure continuity across keyframes, we re-target the forward simulations to the drawn strokes. Finally, we synthesize a 3D character motion matching the dynamic line. The fact that the line can move freely like an elastic band raises new questions about its relationship to the body over time. The line may move faster and leave body parts behind, or the line may slide slowly towards other body parts for support. We conjecture that the artist seeks to maximize the filling of the line (with the character's body)-while respecting basic realism constraints such as balance. Based on these insights, we provide a method that synthesizes 3D character motion, given discontinuously constrained body parts that are specified by the user at key moments.
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    ShipShape: A Drawing Beautification Assistant
    (The Eurographics Association, 2015) Fišer, Jakub; Asente, Paul; Sýkora, Daniel; Ergun Akleman
    Sketching is one of the simplest ways to visualize ideas. Its key advantage is requiring the user to have neither deep knowledge of a particular drawing software nor any advanced drawing skills. In practice, however, all these skills become necessary to improve the visual fidelity of the resulting drawing. In this paper, we present ShipShape-a general beautification assistant that allows users to maintain the simplicity and speed of freehand sketching while still taking into account implicit geometric relations to automatically rectify the output image. In contrast to previous approaches ShipShape works with general Bézier curves, enables undo/redo operations, is scale independent, and is fully integrated into Adobe Illustrator. We demonstrate various results to demonstrate capabilities of the proposed method.