Pages: pp. 1189-1190
This special section presents expanded versions of four of the best papers from SCA 2011, the 10th annual ACM SIGGRAPH/Eurographics Symposium on Computer Animation. SCA has established itself as the premier conference dedicated specifically to innovations in the software and technology of computer animation. SCA 2011 was held in Vancouver, Canada, from 5-7 August 2011. Of the 77 paper submissions, 30 were accepted for publication and presentation at SCA. Each full-paper submission received four high-quality reviews from our 71-member program committee, followed by a thorough week-long online discussion. We are delighted to present the four papers invited for this special section as representing the very best of SCA 2011. This selection was informed by the original reviews and the conference presentations. Each of the invited papers contains a minimum of 30 percent new material and received at least three reviews, including one reviewer not among the original SCA reviewers.
The first paper, “A Multigrid Fluid Pressure Solver Handling Separating Solid Boundary Conditions,” tackles two difficult problems at once. First, it develops a practical multigrid solution for fluid simulation, based on the Poisson equation arising from variational methods. Second, it further demonstrates that a multigrid method can solve the linear complementarity problem needed to enforce nonsticky boundary conditions.
The second paper, “Preserving Fluid Sheets with Adaptively Sampled Anisotropic Particles,” tackles a very different aspect of fluid simulation. It develops a particle-based framework that preserves thin fluid sheets. The key innovation is the introduction of adaptively sampled anisotropic particles that can split and merge as required by the situation. This yields a method that offers ease of implementation, including parallelization, and can produce visually complex liquid animations with thin structures such as fluid sheets.
The third paper, entitled “Detail-Preserving Controllable Deformation from Sparse Examples,” examines how to build high quality animated deformable models from a very sparse set of high resolution scans of hands. The solution is developed around the insight that learned deformation mappings should use a good model of local similarity. For the case of a hand, this should include both spatial proximity and the pose space of the hand. When further augmented by fine-scale displacement modeling, this allows for high quality deformable hand models to be constructed from as few as 14 example poses.
The fourth paper looks at the problem of developing physics-based skinning models based on modal deformations. Entitled “Physics-Based Character Skinning Using Multidomain Subspace Deformations,” it develops the use of modal deformations as applied to multiple connected body parts. The challenge that arises is that of how to efficiently model the coupling that is introduced where these body parts are connected because the unconstrained deformation modes will generally be incompatible with each other. A novel Fast Sandwich Transform is proposed as a solution, which allows for interactive simulation with hundreds of modes.
Seen together, these four papers all provide insights into how to build models of diverse phenomena (fluids, hands, and character skins) that are rich in detail, but that exploit underlying representations that can be surprisingly sparse. We expect that this will be an important theme for years to come.
Michiel van de Panne