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Multiresolution　Free　Form　Object　Modeling　with　PointSampled　Geometry

Journal of Computer Science & Technology 2004年第5期19卷 607-617页

作者： Yong-JinLiu KaiTang Ming-FaiYuen DepartmentofIndustrialEngineeringandEngineeringManagement HongKongUniversityofScienceandTechnologyHongKongP.R.China DepartmentofMechanicalEngineering HongKongUniversityofScienceandTechnologyHongKongP.R.China

In this paper an efficient framework for the creation of 3D digital contentwith point sampled ge-ometry is proposed. A new hierarchy of shape representations with three levelsis adopted in this framework. Based on this new hierarchical shape representation, the proposedframework offers concise integration of various volumetric- and surface-based modeling techniques,such as Boolean operation, offset, blending, free-form defor-mation, parameterization and texturemapping, and thus simplifies the complete modeling process. Previously to achieve the same goal,several separated algorithms had to be used independently with inconsistent volumetric and surfacerepresentations of the free-form object. Both graphics and industrial applications are presented todemonstrate the effectiveness and efficiency of the proposed framework.

关键词： object hierarchy and geometric transformation feature representation three-dimensional graphics and realism system and information processing

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Dynamic skin deformation simulation using musculoskeletal model and soft tissue dynamics

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Computational Visual Media 2017年第1期3卷 49-60页

作者： Akihiko Murai Q.Youn Hong Katsu Yamane Jessica K.Hodgins National Institute of Advanced Industrial Science and Technology Tokyo135-0064Japan Carnegie Mellon University USA Disney Research USA

Deformation of skin and muscle is essential for bringing an animated character to life. This deformation is difficult to animate in a realistic fashion using traditional techniques because of the subtlety of the skin deformations that must move appropriately for the character design. In this paper, we present an algorithm that generates natural, dynamic, and detailed skin deformation(movement and jiggle) from joint angle data sequences. The algorithm has two steps: identification of parameters for a quasi-static muscle deformation model, and simulation of skin deformation. In the identification step, we identify the model parameters using a musculoskeletal model and a short sequence of skin deformation data captured via a dense marker set. The simulation step first uses the quasi-static muscle deformation model to obtain the quasi-static muscle shape at each frame of the given motion sequence(slow jump). Dynamic skin deformation is then computed by simulating the passive muscle and soft tissue dynamics modeled as a mass–spring–damper system. Having obtained the model parameters, we can simulate dynamic skin deformations for subjects with similar body types from new motion data. We demonstrate our method by creating skin deformations for muscle co-contraction and external impacts from four different behaviors captured as skeletal motion capture data. Experimental results show that the simulated skin deformations are quantitatively and qualitatively similar to measured actual skin deformations.

关键词： three-dimensional graphics and realism musculoskeletal model quasi-static muscle model dynamic skin deformation

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