https://www.npcglib.orgNon-photorealistic computer graphics resources.en-usCopyright 2010, NPCGLibstathis@npcglib.orgWed, 5 May 2010 10:06:39 +0100http://blogs.law.harvard.edu/tech/rss600 https://www.npcglib.org/paper.php?entryid=840 https://www.npcglib.org/paper.php?entryid=840 A significant amount of computer graphics research has been aimed at achieving more and more realistic renditions of synthetic scenes. A longtime goal has been to render a scene so perfectly that it is indistinguishable from a photograph of the real scene, a goal called PHOTOREALISM. With the latest graphics hardware, some photorealistic effects are becoming possible in real-time rendering... Randi J. Rost, Bill Licea-Kane Wed, 05 May 2010 10:06:29 +0100 https://www.npcglib.org/paper.php?entryid=839 https://www.npcglib.org/paper.php?entryid=839 This paper presents a novel meshless, physically-based framework for line art rendering of surfaces with complex geometry and arbitrary topology. We apply an inviscid ?uid ?ow simulation using Smoothed Particles Hydrodynamics to compute the global velocity and cross ?elds over the surface model. These ?elds guide the automatic placement of strokes while extracting the geometric and topological ... Afonso Paiva, Emilio Vital Brazil, Fabiano Petronetto, Mario Costa Sousa Wed, 10 Mar 2010 09:54:15 +0100 https://www.npcglib.org/paper.php?entryid=838 https://www.npcglib.org/paper.php?entryid=838 Three-dimensional shape can be drawn using a variety of feature lines, but none of the current definitions alone seem to capture all visually-relevant lines. We introduce a new definition of feature lines based on two perceptual observations. First, human perception is sensitive to the variation of shading, and since shape perception is little affected by lighting and reflectance modificat... Tilke Judd, Frédo Durand, Edward Adelson Mon, 01 Mar 2010 21:08:08 +0100 https://www.npcglib.org/paper.php?entryid=828 https://www.npcglib.org/paper.php?entryid=828 Starting from an input video, we replicate the manual technique of paint-on-glass animation. Motion maps are used to represent the regions where changes occur between frames. Edges are the key to identifying frame-to-frame changes, and a strong motion map is constructed from the edges in each frame, displaced by the motion vector. A second, weak motion map records the other pixels where there i... Young Sup Park, Kyung Hyun Yoon Fri, 26 Feb 2010 12:17:27 +0100 https://www.npcglib.org/paper.php?entryid=836 https://www.npcglib.org/paper.php?entryid=836 We propose a set of algorithms to efficiently make speech animation for 3D cartoon characters. Our prototype system is based on blendshapes, a linear interpolation technique, which is widely used in facial animation practice. In our system, a few base target shapes of the character, prerecorded voice, and its transcription are required as input. We describe a simple technique that amplifies the... Shin-ichi Kawamoto, Tatsuo Yotsukura, Ken Anjyo, Satoshi Nakamura Wed, 24 Feb 2010 19:48:21 +0100 https://www.npcglib.org/paper.php?entryid=837 https://www.npcglib.org/paper.php?entryid=837 In this paper we propose an approach, which allows the users to synthesize cartoon clips according to the perspective of the background image. In order to construct the cartoons smoothly, the character's edge distance and motion direction distance are demonstrated to be the factors affecting the human perception in similarity evaluation, and utilized in cartoon clips synthesis. When applying th... Yueting Zhuang, Jun Yu, Jun Xiao, Cheng Chen Wed, 24 Feb 2010 19:47:13 +0100 https://www.npcglib.org/paper.php?entryid=835 https://www.npcglib.org/paper.php?entryid=835 We present a novel approach to the creation of varied animations from a small set of simple 2D input shapes. Instead of providing a new 2D shape for each keyframe of an animation sequence, we interpolate between a few example shapes in a reduced pose-space. Similar approaches have been presented in the past, but were restricted in the types of input or range of deformations allowed. In order to... William Baxter, Pascal Barla, Ken Anjyo Wed, 24 Feb 2010 19:30:59 +0100 https://www.npcglib.org/paper.php?entryid=834 https://www.npcglib.org/paper.php?entryid=834 In this paper, we propose an instant shadow generation technique for 2D animation, especially Japanese Anime. In traditional 2D Anime production, the entire animation including shadows is drawn by hand so that it takes long time to complete. Shadows play an important role in the creation of symbolic visual effects. However shadows are not always drawn due to time constraints and lack of animato... Eiji Sugisaki, Hock Soon Seah, Feng Tian, Shigeo Morishima Wed, 24 Feb 2010 19:24:37 +0100 https://www.npcglib.org/paper.php?entryid=833 https://www.npcglib.org/paper.php?entryid=833 We present an algorithm for rendering high-quality line primitives of controllable on-screen width within a ray tracing framework, which can render simple NPR-style feature lines, including silhouette edges, crease lines, and primitive intersection lines. The algorithm is based on a variant of cone tracing, which measures distances in screen space and is used to detect and render feature lines.... A.N.M. Imroz Choudhury, Steven G. Parker Tue, 23 Feb 2010 16:47:36 +0100 https://www.npcglib.org/paper.php?entryid=829 https://www.npcglib.org/paper.php?entryid=829 This paper presents the results of a study in which artists made line drawings intended to convey specific 3D shapes. The study was designed so that drawings could be registered with rendered images of 3D models, supporting an analysis of how well the locations of the artists' lines correlate with other artists', with current computer graphics line definitions, and with the underlying different... Forrester Cole, Aleksey Golovinskiy, Alex Limpaecher, Heather Stoddart Barros, Adam Finkelstein, Thomas A. Funkhouser, Szymon Rusinkiewicz Tue, 15 Dec 2009 15:59:21 +0100