Cue Angle includes work derived from the following projects.

pooltool (https://github.com/ekiefl/pooltool), Copyright (c) Evan Kiefl and contributors, Apache License 2.0.
  The physics engine in src/physics is a TypeScript port of pooltool's event-based simulation, collision resolution
  models and quartic root solver. Test fixtures in test/golden were generated by pooltool.

Dr. Dave Alciatore's Table Difficulty Factor (TDF) data (https://billiards.colostate.edu/) is used for the pocket
difficulty presets.