public static BasicUniverse SunEarth(double distance, double sunMass, double height = 0)
{
double gravConstant = 1.0;
double earthMass = Math.Pow(10, -5);
double moonMass = Math.Pow(10, -10);
double earthSpeed = Math.Sqrt(gravConstant * sunMass / distance); // for circular orbit
earthSpeed *= 1.2;
double moonSpeed = Math.Sqrt(gravConstant * sunMass / (0.8 * distance));
var sun = BodyFactory.PointMass(sunMass, Vector3.Zero + Vector3.J * height, Vector3.Zero);
sun.Dynamics.Fix();
var earth = BodyFactory.PointMass(earthMass, distance * Vector3.I + Vector3.J * height, earthSpeed * Vector3.K);
earth.Dynamics.ThrustInputs(Vector3.Zero, new Vector3(0.1, 0.1, 0.1), 1); // add a slight rotation to earth
var moon = BodyFactory.PointMass(moonMass, 0.8 * distance * Vector3.I + Vector3.J * height, moonSpeed * Vector3.J);
moon.Dynamics.ThrustInputs(Vector3.Zero, new Vector3(0.1, 0.1, 0.1), 1); // add a slight rotation to earth
var uni = new BasicUniverse();
uni.Bodies.Add(sun, earth, moon);
uni.ForceFields.Add(ForceFieldFactory.Gravity(sun, gravConstant * sunMass));
return(uni);
}
public static BasicUniverse BouncyGravity(double distance, double sunMass)
{
double gravConstant = 1.0;
double earthMass = Math.Pow(10, -5);
var sun = BodyFactory.SphereMass(0.2, sunMass, Vector3.Zero, Vector3.Zero);
sun.Dynamics.Fix();
sun.Material.DynamicFrictionCoef = 0.0f;
sun.Material.StaticFrictionCoef = 0.0f;
var satOne = BodyFactory.SphereMass(0.2, earthMass, distance * Vector3.I, Vector3.Zero);
satOne.Material.Epsilon = 0.75f;
satOne.Material.DynamicFrictionCoef = 0.05f;
satOne.Material.StaticFrictionCoef = 0.1f;
var satTwo = BodyFactory.SphereMass(0.2, earthMass, -distance * Vector3.I, Vector3.I - Vector3.J - Vector3.K);
satTwo.Material.Epsilon = 0.75f;
satTwo.Material.DynamicFrictionCoef = 0.05f;
satTwo.Material.StaticFrictionCoef = 0.1f;
var satThree = BodyFactory.SphereMass(0.2, earthMass, distance * Vector3.J, Vector3.I - Vector3.J - Vector3.K);
satThree.Material.Epsilon = 0.75f;
satThree.Material.DynamicFrictionCoef = 0.05f;
satThree.Material.StaticFrictionCoef = 0.1f;
var satFour = BodyFactory.SphereMass(0.2, earthMass, -distance * Vector3.J, Vector3.I - Vector3.J - Vector3.K);
satFour.Material.Epsilon = 0.75f;
satFour.Material.DynamicFrictionCoef = 0.05f;
satFour.Material.StaticFrictionCoef = 0.1f;
var satFive = BodyFactory.SphereMass(0.2, 10 * earthMass, -10 * distance * Vector3.J, Vector3.J);
satFive.Material.Epsilon = 0.75f;
satFive.Material.DynamicFrictionCoef = 0.05f;
satFive.Material.StaticFrictionCoef = 0.1f;
var uni = new BasicUniverse();
uni.Bodies.Add(sun, satOne, satTwo, satThree, satFour, satFive);
uni.ForceFields.Add(ForceFieldFactory.Gravity(sun, gravConstant * sunMass));
return(uni);
}
