This library supports the physically-based simulation of mechanical effects. In the last years position-based simulation methods have become popular in the graphics community. In contrast to classical simulation approaches these methods compute the position changes in each simulation step directly, based on the solution of a quasi-static problem. Therefore, position-based approaches are fast, stable and controllable which make them well-suited for use in interactive environments. However, these methods are generally not as accurate as force-based methods but still provide visual plausibility. Hence, the main application areas of position-based simulation are virtual reality, computer games and special effects in movies and commercials.

The PositionBasedDynamics library allows the position-based handling of many types of constraints in a physically-based simulation. The library uses CMake, Eigen, json and AntTweakBar (only for the demos). All external dependencies are included.

Furthermore we use our own library:

• Discregrid to generate cubic signed distance fields for the collision detection

Author: Jan Bender, License: MIT

• Our new paper about a Direct Position-Based Solver for Stiff Rods uses the PositionBasedDynamics library. You can watch the video here.
• PBD now has a collision detection based on cubic signed distance fields
• SPlisHSPlasH is our new open-source fluid simulator which uses the PositionBasedDynamics library to handle rigid-fluid coupling. It can be downloaded here: htt