#VisualSpinner3D
http://infiniteperplexity.github.io/visual-spinner-3d
VisualSpinner3D is a javascript engine for visualizing the movements of flow arts props, including poi, staves, hoops, and fans. It is, to the best of my knowledge, the closest anyone has come to creating a fully general "flow simulator." Details here:
http://infiniteperplexity.github.io/visual-spinner-3d/details.html