Physically-Based Animation

Fluids still pose a fundamental problem in real-time applications. In this project we work in parallel in two directions. One is the development of particle-based Lagrangian methods for simulating complex 3D effects, and the other is the coupling of 2D and 3D methods.

The use of particles instead of a volumetric mesh has several advantages for fluid simulation. Advection is very simple using a Lagrangian method compared with standard Eulerian methods, as the material properties move together with the particles. Furthermore, mass conservation is trivially fulfilled and the method does not suffer from dissipation. Finally, using a particle-based Lagrangian approach enables to combine deformable solids and fluids into one framework, which allows simulating phase transitions such as melting and freezing, as well as combining solid and fluid characteristics in goop-like viscoelastic materials such as clay and mucus.

Particle-based methods are also specially geared towards interactive fluid simulation. Their high computational efficiency enables interactive simulations with rich effects that cannot be achieved through Eulerian methods. Following this line of research, we have designed interactive algorithms for particle-based fluid simulation and coupling between fluids and deformable solids.

• R. Keiser, B. Adams, D. Gasser, P. Bazzi, P. Dutré, M. Gross, A Unified Lagrangian Approach to Solid-Fluid Animation, Proceedings of the Symposium on Point-Based Graphics 2005, pp. 125-133 (Stony Brook, USA, June 21-22)
  [Abstract] [PDF] [Video] [Video] [Video] [Video] [Video]
• M. Müller, B. Solenthaler, R. Keiser, M. Gross, Particle-Based Fluid-Fluid Interaction, Proceedings of the Eurographics Symposium on Computer Animation 2005 '05, pp. 237-244 (Los Angeles, USA, July 29 - 31, 2005)
  [Abstract] [PDF] [Video] [Video] [Video] [Video]
• M. Müller, S. Schirm, M. Teschner, B. Heidelberger, M. Gross, Interaction of Fluids with Deformable Solids, Proceedings of Computer Animation and Virtual Worlds (CAVW), pp. 159-171 (CASA 2004, Geneva, Switzerland, July 7-9, 2004)
  [Abstract] [PDF] [Video] [Video] [Video] [Video]
• M. Müller, D. Charypar, M. Gross, Particle-Based Fluid Simulation for Interactive Applications, Proceedings of ACM SIGGRAPH / EG Symposium on Computer Animation 2003, D. Breen, M. Lin (eds.), ACM NY, pp. 154-159 (ACM SIGGRAPH / EG Symposium on Computer Animation 2003, San Diego, CA, USA, July 26-27, 2003)
  [Abstract] [PDF] [Video]