mattleibow / Jitterphysics

Jitter Physics

Jitter Physics is a fast and lightweight 3D physics engine written in C#.

Jitter Physics Cloth	Speculative Contacts Jitter Physics

Platforms & Frameworks

• Every platform which supports .NET, Mono or Xamarin
• Works with the Mono framework on Linux/Mac without any recompilation
• Also supports the Xbox360 and Windows Phone (up to v0.1.7)
• No dependencies. Every 3D engine/framework is supported: OpenTK, SlimDX, SharpDX, XNA, IrrlichtEngine, Urho3D

Overall Design

• Written in pure C# with a clean and object orientated API
• Optimized for low to no garbage collections and maximum speed
• Supported Shapes: TriangleMesh, Terrain, Compound, MinkowskiSum, Box, Sphere, Cylinder, Cone, Capsule, ConvexHull
• Take advantage of multi-core CPUs by using the internal multithreading of the engine

Jitter Physics (2D)

The "Jitter-2D" branch is still in development an is not complete. At this time, it is probably better to make use of Farseer Physics.

Quick Start

Initialize the Physics System

Create a world class and initialize it with a CollisionSystem:

CollisionSystem collision = new CollisionSystemSAP();
World world = new World(collision);

Add Objects to the World

Create a shape of your choice and pass it to a body:

Shape shape = new BoxShape(1.0f, 2.0f, 3.0f);
RigidBody body = new RigidBody(shape);

It's valid to use the same shape for different bodies. Set the position and orientation of the body by using it's properties. The next step is to add the Body to the world:

world.AddBody(body);

Run the Simulation

Now you can call the Step method to integrate the world one timestep further. This should be done in you main game loop:

while (gameRunning)
{
    world.Step(1.0f / 100.0f, true);
    
    // do other stuff, like drawing
}

The first parameter is the timestep. This value should be as small as possible to get a stable simulation. The second parameter is for whether using internal multithreading or not. That's it the body is now simulated and affected by default gravity specified in World.Gravity. After each timestep the Position of the body should be different.

Credits

This library was originally written by Thorben Linneweber. Original source code can be found at https://code.google.com/archive/p/jitterphysics.