Obi is an advanced particle-based physics engine capable of simulating a wide range of deformable material behaviors, capable of running both in the CPU and the GPU.
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Obi Fluid v7.1 (17 Jun 2025) (Latest version)
Obi Fluid v7.0.4
Obi Fluid v6.5.4
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With Obi Fluid you can create fully multi-threaded AAA quality fluid simulations with ease. Fluids react to each other, can affect and be affected by rigid bodies (even make them float or sink!), and are capable of sticking to surfaces.
Please note that fluid simulation is a very intensive task. Be aware of its performance implications before using it.
Available for Windows, Mac, iOS and Android.
Links
Obi Website
Community and Support Forum
What to use it for:
– Small scale fluid simulations
– 2D fluid game mechanics
– Dripping fluid
– Splash effects
What NOT to use it for:
– Large scale fluid simulations
– Pools, oceans, lakes, floods
All physical properties or the fluid are adjustable: viscosity, density, surface tension, stickiness, vorticity…
Features:
– Custom emitter shapes.
– Two-way rigid body interaction.
– Modular solver: don’t waste performance, all parameters are exposed.
– Adjustable solver iteration count.
– Per-particle properties: surface tension, vorticity, buoyancy….
– Hassle-free particle resolution adjust using a single parameter.
– Supports fluids of different resolution interacting in the same simulation.
– Supports high density ratios in multiphase simulations.
– Supports Box, Sphere, Capsule, Mesh, Character and Terrain colliders.
– Automatic camera culling: non-visible fluids do not update their simulation.
