Godot N-body simulation

A Godot-Plugin for simulating gravitational attraction between bodies in 3D-Space. Any class that inherits from Spatial can be added to the simulation.

Usage

1. Add NBodySimulation3D-node to your scene.

2. Add all Elements that should attract each other as children of the simulation node.

   • every node that should be affected needs the properties mass: float and velocity, so make sure to add those to their scripts.

3. Modify the parameters of the NBodySimulation3D to fit your case.

   • G: The gravity constant. This determines how much the planets attract each other

   • Time Multiplier: Slows or speeds up the simulation time.

   • Theta: Threshold for the octant-size / distance ratio. The higher the value the simulation can be calculated but the less accurate it gets. See The Barnes-Hut Algorithm for reference.

4. Start the scene and the simulation will automatically compute die forces and move the bodies.

Note	If you use RigidBody-nodes inside the N-body simulation, make sure to set physics/3d/default_gravity to 0 in your project settings. Otherwise the bodies will still be affected by the linear gravity of the world.