Celestial body simulator

A very simple celestial body simulator, made in bevy, aimed to be a starting point of a more complex simulator.

Example

To launch the simulator, you must first define a JSON file that describes every aspect of each body you want to simulate, like this:

[
    {
        "position": [0.0, 0.0, 0.0],
        "radius": 5.0,
        "color": [255, 0, 0, 255],
        "light": true,
        "velocity": [0.0, 0.0, 0.0],
        "acceleration": [0.0, 0.0, 0.0],
        "mass": 10000000000.0
    },
    {
        "position": [8.0, 8.0, 1.0],
        "radius": 1.0,
        "color": [0, 255, 0, 255],
        "light": false,
        "velocity": [0.0, 0.0, 0.0],
        "acceleration": [0.5, 0.0, 0.0],
        "mass": 100.0
    }
]

Here is the use for every field:

• position: the position of the body in 3d space.
• radius: the radius of body.
• color: must be given in RGBA format, useful to identify the bodies one from the other.
• light: whether the body is a light emitter, such as a star.
• velocity: velocity of the body, as a vector in 3d space.
• acceleration: the acceleration of the body as a vector in 3d space.
• mass: the mass of the body.

Every field that accepts a 3 element array describes a vector or position in 3d space with the x axis as the 1st element, the y axis (vertical) as the 2nd, and the z axis as the 3rd element.

Once you've set that data, run:

$ celestial-body-sim data.json

As long as space isn't pressed, movement of the bodies will stay still. Once space is pressed (and held down) the simulation of velocity, acceleration and gravity will resume.

The simulator in action

this orbit was achieved with the following JSON config:

[
    {
        "position": [0.0, 0.0, 0.0],
        "radius": 1.0,
        "color": [255, 0, 0, 255],
        "light": true,
        "velocity": [0.0, 0.0, 0.0],
        "acceleration": [0.0, 0.0, 0.0],
        "mass": 9.58001e12
    },
    {
        "position": [8.0, 8.0, 1.0],
        "radius": 0.5,
        "color": [0, 255, 0, 255],
        "light": false,
        "velocity": [2.0, -3.6, 0.0],
        "acceleration": [0.0, 0.0, 0.0],
        "mass": 600000.0
    }
]