SCA 10: Eurographics/SIGGRAPH Symposium on Computer Animation
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Browsing SCA 10: Eurographics/SIGGRAPH Symposium on Computer Animation by Subject "Categories and Subject Descriptors (according to ACMCCS): I.3.7 [Computer Graphics]: Three Dimensional Graphics and Realism-Animation"
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Item Constraint-Based Simulation of Adhesive Contact(The Eurographics Association, 2010) Gascon, Jorge; Zurdo, Javier S.; Otaduy, Miguel A.; MZoran Popovic and Miguel OtaduyDynamics with contact are often formulated as a constrained optimization problem. This approach allows handling in an integrated manner both non-penetration and frictional constraints. Following developments in the computational mechanics field, we have designed an algorithm for adding the simulation of adhesive contact constraints in the context of state-of-the-art constraint-based contact solvers. We show that implicit adhesion constraints can be handled with minor changes to existing solvers, and we demonstrate our algorithm on a diverse range of objects, including mass-spring cloth, volumetric finite-element models, and rigid bodies.Item Modeling Style and Variation in Human Motion(The Eurographics Association, 2010) Ma, Wanli; Xia, Shihong; Hodgins, Jessica K.; Yang, Xiao; Li, Chunpeng; Wang, Zhaoqi; MZoran Popovic and Miguel OtaduyStyle and variation are two vital components of human motion: style differentiates between examples of the same behavior (slow walk vs. fast walk) while variation differentiates between examples of the same style (vigorous vs. lackadaisical arm swing). This paper presents a novel method to simultaneously model style and variation of motion data captured from different subjects performing the same behavior. An articulated skeleton is separated into several joint groups, and latent variation parameters are introduced to parameterize the variation of each partial motion. The relationships between user-defined style parameters and latent variation parameters are represented by a Bayesian network that is automatically learned from example motions. The geostatistical model, named universal Kriging, is extended to be a style-and-variation interpolation to generate partial motions for all joint groups. Experiments with sideways stepping, walking and running behaviors have demonstrated that the motion sequences synthesized by our method are smooth and natural, while their variations can be easily noticed even when their input style parameters are the same.