Fluidity: heightfield fluid simulation

Something I’ve been working on for a while, Fluidity is an interactive water simulator. Uses a 2D heightfield to represent water.

You can pour water onto the terrain, sculpt the ground with circle, mound and plateau brushes, and watch the water flow, pool and cascade in real time.

• Under the hood it is a shallow-water solver using HLL fluxes, with well-balancing so a still lake stays still over uneven ground
• Adaptive CFL-based timestep. Gravity, bottom friction, viscosity, surface tension and adhesion are all settings you can tune.
• Live stats show volume, active cells and FPS, and there is a kinetic energy overlay for debugging the flow.