VELLUM
Houdini 19 adds Fluids to Vellum to make it a complete unified multi-solver that can help you create a wide range of visual effect shots. Vellum can also be used interactively in the viewport to support artist-driven workflows.
VELLUM | Rigids & Plasticity
Shape matching makes it possible to include rigid elements in your Vellum simulations. Plasticity is also available to allow for denting. While the Bullet solver will still be needed for large scale effects, Vellum offers a good solution for small scale integrated simulations.