Obi

Unified particle physics for Unity

Obi is the first CPU-based realtime particle physics engine for Unity:

Unified framework for character and interactive cloth, fluids, ropes, softbodies...
Advanced editor tools
Extremely performant, multithreaded solver
Two-way interaction with rigidbodies, supports all collider types
From low budget, simple effects to extremely complex behavior
Latest research papers applied, based on cutting-edge technology
Easily extensible and modular architecture
Fast support and regular updates

The most advanced cloth simulator for Unity. It brings back and improves pre-5.x cloth functionality.

Support for skinned meshes: unified solution for character clothing and regular cloth.
Cloth proxies: drive high resolution meshes using low-res simulations. Works with skinned meshes too!
Softbody physics trough volume constraints.
Independent stretch and bend constraints.
Cloth is attachable to rigid bodies.
Cloth can collide with itself and other cloth pieces.
Physically based aerodynamics model.
In-editor simulation preview.
Easy-to-use integrated editor tools, don´t ever leave Unity when authoring cloth.
Save your prefabs mid-simulation and instantiate them already warm-started.
Supports all standard Unity colliders.
Two-sided shader (based on the Standard shader) with correct lighting on backfaces.
Automatic camera culling.

Obi Rope will allow you to create realistic ropes and chains fast, with absolute control over their look.

Procedural smooth mesh generation using splines, complete with tangent space updating and normal map support. No need to manually generate geometry for your ropes.
Change rope length at runtime, Tearable/cuttable rope, Closed loops.
Modular solver: don't waste performance, only use the constraints your rope needs.
Bending constraints and per particle pin constraints.
In-editor simulation preview.
Easy-to-use editor particle tools: selection, brush selection, paintbrush, property smoothing...
You can save your ropes mid-simulation and instantiate them already warm-started.
Supports all standard Unity colliders.
Automatic camera culling: non-visible ropes do not update their simulation.

Obi Fluid is a fully-fledged 2D and 3D realtime fluid simulator for Unity.

All physical properties or the fluid are adjustable: surface tension, stickiness, vorticity...
Fluids can adhere to surfaces, form drops, split and merge...
Advect passive particles trough the fluid: bubbles, foam, dust...
Custom emitter shapes.
Two-way rigid body interaction.
Modular solver: don't waste performance, all parameters are exposed.
Supports high density ratios in multiphase simulations.
You can save your fluids mid-simulation and instantiate them already warm-started.
Supports many types of colliders
Automatic camera culling: non-visible fluids do not update their simulation.

New in versión 4, released in January 2019. A high-quality, high-performance soft body simulator based on cutting-edge technology.

Simulate complex softbody meshes composed of thousands of polygons, complete with collisions, self-collisions and rigid body interaction.

Advanced oriented-particle XPBD solver
Turn entire objects into softbodies, as well as specific parts of characters.
Unconditionally stable: the simulation will never blow up.
Two-way rigid body interaction: softbodies will react to rigidbodies and vice-versa.
Modular solver: don't waste performance, only use the constraints your softbody needs.
Per module adjustable solver iteration count.
Works with all kinds of meshes, even non-manifold ones.
Any part of a softbody can be attached to any collider/rigidbody, using rotating as well as fixed orientation links.
Self and inter-collisions: softbodies can collide with themselves and other softbodies. - In-editor simulation preview.
Automatic camera culling: non-visible softbodies won't consume resources.