Unified particle physics for real-time applications

Abstract

We present a unified dynamics framework for real-time visual effects. Using particles connected by constraints as our fundamental building block allows us to treat contact and collisions in a unified manner, and we show how this representation is flexible enough to model gases, liquids, deformable solids, rigid bodies and cloth with two-way interactions. We address some common problems with traditional particle-based methods and describe a parallel constraint solver based on position-based dynamics that is efficient enough for real-time applications.

Adaptive Position-Based Fluids: Improving Performance of Fluid Simulations for Real-Time Applications

“…Furthermore, integration into a unified solver, e.g. a parallel successive over-relaxation solver [7], might reveal new insights.…”

“…Performing the default solver steps desired particle locations will cause additional velocity to be added to the affected particles, which in turn causes visual artifacts to appear. In order to compensate for these artifacts, stabilization [7] to a subset of the particles.Pre-stabilization in our obstacles by adjusting the predicted as well as the current positions solving step ( Figure 6). …”

“…In particular, fluid simulations that can interact with other physical objects in the scene have become more and more popular [1,2,3].The approach of Position Based Fluids (PBF) by Macklin et al [4] has relaxed previous limitations while maintaining stability. It uses position-based dynamics and constraint functions based on Smoothed Particle Hydrodynamics (SPH) [5,6].Moreover, it allows for a seamless integration into other position-based methods that are widely spread in the scope of real-time applications [7].…”

Estimating the deformability of elastic materials using optical flow and position-based dynamics

“…They update the behavior of objects relying solely on positional information unlike force-based approaches such as FEM and mass-spring methods [16]. They are designed to be fast, controllable and stable in simulating interactive graphical environments such as clothes, deformable solids and fluids [17]. All those properties are desirable assets for active perception in robotics applications.…”

Rigid Body Interaction for Large-Scale Real-Time Water Simulation

“…In the particle-based fluids, even the real-time results are very impressive for small amounts of fluids [5]. Sadly, neither of these approaches are fast enough for real-time modeling of large bodies of water, such as rivers and lakes [6].…”