private void CreateSphereOfInfluence()
{
sphereOfInfluence = AstroUtils.CalculateSOIFromMass(planetData);
if (sphereOfInfluence > AstroUtils.KERBIN_SOI * 30)
{
// This is where Jool's SOI caps out -- we don't want to go any larger
sphereOfInfluence = AstroUtils.KERBIN_SOI * 30;
}
}
public void CreateOrbit()
{
if (orbitData.randomized || Hyperdrive.seedString == AstroUtils.KERBIN_SYSTEM_COORDS)
{
// Already randomized data
return;
}
orbitData = new OrbitData();
orbitData.randomized = true;
if (IsSun())
{
// Special case
orbitData.referenceBody = solarSystem.sun;
orbitData.semiMajorAxis = 0;
return;
}
float value = WarpRNG.GetValue();
#region Reference Body
referenceBodyData = null;
referenceBody = null;
// Planet is in a solar orbit if any of these are true:
// 1. RNG rolls a value above at or below 0.25 (25% chance)
// 2. There is only one planet in the solar system (should never happen).
// 3. We already have a moon orbiting us (no moons orbiting other moons)
if (value <= 0.25f || solarSystem.planetCount <= 1 || childBodies.Count > 0)
{
referenceBody = solarSystem.sun;
referenceBodyData = solarSystem.sunData;
}
else
{
// We will be a moon
List <int> attemptedInts = new List <int> ();
int attempts = 0;
// Toss out a candidate if any of the following is true:
// 1. The reference body is null or us (causes KSP to crash)
// 2. The reference body is a moon
// 3. The reference body is smaller than us
// Move us to solar orbit after 100 attempts.
while ((referenceBody == null || referenceBody == planet || referenceBodyData.referenceBody != solarSystem.sun || referenceBody.Radius < planet.Radius))
{
attempts++;
// Keep track of already-attempted planets
// Might change this to pull a list of all planets from the solar system and poll that
int index = WarpRNG.GenerateInt(0, solarSystem.planetCount);
if (attemptedInts.Contains(index))
{
continue;
}
attemptedInts.Add(index);
// Get the planet dictated by the random int
referenceBodyData = solarSystem.GetPlanetByID(index);
referenceBody = referenceBodyData.planet;
if (attempts >= 100)
{
referenceBody = solarSystem.sun;
referenceBodyData = solarSystem.sunData;
break;
}
// Loop will do a logic check to make sure the chosen planet is valid
// Will continue iterating until we have found a valid planet
}
}
// Notify the solar system and the planet itself that our reference body has a new body orbiting it
solarSystem.AddChildToPlanet(referenceBodyData, planet);
// Update orbital data
orbitData.referenceBody = referenceBody;
#endregion
#region Gravity
float gravityMult = 0.0f;
if (IsMoon())
{
// Moons in KSP for the most part have SOIs which are greater than their real-life counterparts
// SOI -> Gravity is not a 1:1 ratio; instead a moon's SOI is usually 7-8 times more powerful than its gravity
// To skew the gravity data for moons, we use the formula y = (0.0788628 * x^2)-(0.788279 * x)+1.58089
// Note that values below 7.25 generate negative multipliers
float randomGravity = WarpRNG.GenerateFloat(7.25f, 9f);
gravityMult = (0.0788628f * randomGravity * randomGravity) - (0.788279f * randomGravity) + 1.58089f;
}
else
{
gravityMult = WarpRNG.GenerateFloat(0.15f, 2.0f);
value = WarpRNG.GetValue();
// There is a chance that a planet is a gas giant like Jool
if (value <= 0.05f)
{
gravityMult *= 20.0f;
}
}
// All gravity values are relative to Kerbin
gravity = gravityMult * AstroUtils.KERBIN_GRAVITY;
#endregion
#region Inclination
// Inclination starts directly at orbital plane
int inclination = 0;
// Get new random value
value = WarpRNG.GetValue();
if (value >= 0.975f)
{
// 2.5% chance of orbit being between 0 and 180 degrees
inclination = WarpRNG.GenerateInt(0, 180);
}
else if (value >= 0.95f)
{
// 2.5% chance of orbit being between 0 and 60 degrees
inclination = WarpRNG.GenerateInt(0, 60);
}
else if (value >= 0.925f)
{
// 2.5% chance of orbit being between 0 and 45 degrees
inclination = WarpRNG.GenerateInt(0, 45);
}
else if (value >= 0.9f)
{
// 2.5% chance or orbit being between 0 and 25 degrees
inclination = WarpRNG.GenerateInt(0, 25);
}
else if (value >= 0.6f)
{
// 30% chance of orbit being between 0 and 10 degrees
inclination = WarpRNG.GenerateInt(0, 10);
}
else if (value > 0.1f)
{
// 50% chance of orbit being between 0 and 5 degrees
inclination = WarpRNG.GenerateInt(0, 5);
}
else
{
// 10% chance of a 0 inclination orbit
inclination = 0;
}
orbitData.inclination = inclination;
#endregion
#region Eccentricity
// Eccentricity must be a value between 0 and 0.99
double eccentricity = WarpRNG.GetValue();
if (eccentricity == 1)
{
eccentricity = 0.99;
}
// For extreme values of eccentricity, tone it down a bit so planets don't buzz the sun so much
if (eccentricity > 0.95)
{
eccentricity *= 0.5f;
}
else
{
// Below 0.25 eccentricity is ignored
if (eccentricity <= 0.25)
{
// Values above 0.25 are toned down by 10% to keep orbits circlular
eccentricity -= (eccentricity * 0.1f);
}
if (eccentricity <= 0.5)
{
// Values above 0.8 after being toned down are toned down by 25%
eccentricity -= (eccentricity * 0.25f);
}
if (eccentricity <= 0.8)
{
// If values are *still* above 0.8, cut in half
eccentricity *= 0.5f;
}
else
{
// Square resulting eccentricity to make orbits slightly more circular
eccentricity *= eccentricity;
}
if (eccentricity < 0)
{
// Should never happen
eccentricity = 0;
}
}
orbitData.eccentricity = eccentricity;
#endregion
#region Sphere of Influence
sphereOfInfluence = AstroUtils.CalculateSOIFromMass(planetData);
if (sphereOfInfluence > AstroUtils.KERBIN_SOI * 30)
{
// This is where Jool's SOI caps out -- we don't want to go any larger
sphereOfInfluence = AstroUtils.KERBIN_SOI * 30;
}
#endregion
#region Semi-Major Axis
double semiMajorAxis = AstroUtils.MAX_SEMI_MAJOR_AXIS;
if (referenceBodyData.IsSun())
{
// Special case: parent is sun
// Find Semi-Major Axis in KAU (Kerbin Astronomical Units)
// Min is 0.2 (~1.5 solar radii), max is 6.0 (Eeloo orbit)
float kerbinSemiMajorAxisMultiplier = WarpRNG.GenerateFloat(0.02f, 6.0f);
semiMajorAxis = kerbinSemiMajorAxisMultiplier * AstroUtils.KERBAL_ASTRONOMICAL_UNIT;
}
else
{
// Planet is moon
value = WarpRNG.GetValue();
// Floor resulting value at 1%, to be used later
if (value < 0.0001f)
{
value = 0.0001f;
}
// Semi-Major Axis can be anywhere within the hill sphere of parent body
double hillSphere = AstroUtils.CalculateHillSphere(referenceBodyData);
double tempMajorAxis = hillSphere * value;
double parentAtmosphereHeight = planet.Radius + referenceBody.Radius + (referenceBody.atmosphereScaleHeight * 1000.0 * Mathf.Log(1000000.0f));
while (tempMajorAxis < parentAtmosphereHeight)
{
// Inside planet's atmosphere
value += WarpRNG.GenerateFloat(0.001f, 0.1f);
tempMajorAxis = semiMajorAxis * value;
foreach (int id in referenceBodyData.childDataIDs)
{
// This ensures we do not crash into other planets
PlanetData childData = solarSystem.GetPlanetByID(id);
double moonAxis = childData.semiMajorAxis;
double moonMin = moonAxis - childData.planet.Radius;
double moonMax = moonAxis + childData.planet.Radius;
while (tempMajorAxis + planet.Radius >= moonMin && tempMajorAxis <= moonMax)
{
value += WarpRNG.GenerateFloat(0.001f, 0.1f);
tempMajorAxis = semiMajorAxis * value;
}
}
}
semiMajorAxis = tempMajorAxis;
}
// Remove eccentricity from the semi-major axis
if (orbitData.eccentricity != 1.0f)
{
semiMajorAxis /= (1.0 - orbitData.eccentricity);
}
orbitData.semiMajorAxis = semiMajorAxis;
#endregion
#region Longitude Ascending Node
int lan = WarpRNG.GenerateInt(0, 360);
orbitData.longitudeAscendingNode = lan;
#endregion
#region Argument Of Periapsis
int argumentOfPeriapsis = WarpRNG.GenerateInt(0, 360);
orbitData.argumentOfPeriapsis = argumentOfPeriapsis;
#endregion
#region Mean Anomaly at Epoch
float meanAnomalyAtEpoch = WarpRNG.GenerateFloat(0.0f, Mathf.PI * 2.0f);
if (orbitData.semiMajorAxis < 0)
{
meanAnomalyAtEpoch /= Mathf.PI;
meanAnomalyAtEpoch -= 1.0f;
meanAnomalyAtEpoch *= 5.0f;
}
orbitData.meanAnomalyAtEpoch = meanAnomalyAtEpoch;
#endregion
#region Period
orbitData.period = AstroUtils.CalculatePeriodFromSemiMajorAxis(orbitData.semiMajorAxis);
#endregion
}
