The Force Engine


Physics engine library for Unity 3D openly inspired by Open Dynamics Engine (ODE). Wanting more flexibility than I could get using PhysX, I started this Unity port of the open source project. The engine is written in C#, safe code, and is available either as binary or as source code for your Unity 3D project.

The Force Engine is written for and fully integrated with Unity 3D. Components are similar to Physics components with rigid bodies and colliders and using fixed time steps to update physics simulation.

It is possible to move rigid bodies and colliders using transforms, to have local scales, to nest rigid bodies in hierarchies.

It is possible to have PhysX and The Force Engine run side by side in your scene, therefore benefiting from the flexibility, accuracy and control of The Force Engine for gameplay features, and the speed and efficiency of PhysX for non gameplay features.

The Force Engine has been developed and tested on standalone Windows platforms. It should in theory run on all platforms.

The PRO version package contains full source code and no logo.

Current collision matrix in Version 0.05:

Wheel Trimesh Terrain Sphere Ray Plane Capsule Box
Box confused happy happy happy happy happy confused happy
Capsule confused confused confused confused confused happy confused
Plane happy unhappy2 unhappy2 happy happy  unhappy2
Ray confused unhappy2 unhappy2 happy unhappy2
Sphere confused happy happy happy
Terrain happy unhappy2 unhappy2
Trimesh confused unhappy2
Wheel confused


happy Implemented
confused Stable but approximative
unhappy2 Not implemented

Compound objects (many colliders attached to same body) are also supported.

Currently supported joints:

  • Ball
  • Contact
  • Fixed
  • Hinge
  • Hinge2
  • Slider
  • Universal (angular motor)

Currently supported solvers:

  • QuickStep


The Force Engine The Force Engine PRO
Revenue Capacity $100k Unlimited
Full source code provided NO YES
The Force Engine Logo YES NO
Price Free 100 USD