254 lines
No EOL
8.9 KiB
C#
254 lines
No EOL
8.9 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using MessagePack;
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using Unity.Mathematics;
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// TODO: USE THIS EVERYWHERE
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using static Unity.Mathematics.math;
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using Random = Unity.Mathematics.Random;
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public class ZoneGenerator
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{
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// public float BinaryFloor = 100;
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// public float BinaryProbability = .1f;
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// public float MassPowerMinimum = 1.35f;
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// public float MassPowerMaximum = 1.75f;
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// public float DistancePowerMinimum = 1.35f;
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// public float DistancePowerMaximum = 1.75f;
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// public float Radius = 500;
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// public float Mass = 100000;
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// public float MassFloor = 1;
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// public float SunMass = 10000;
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// public float GasGiantMass = 2000;
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// public float RadiusPower = 1.75f;
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public static Planet[] GenerateEntities(GameContext context, ZoneData data, float mass, float radius)
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{
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var random = new Random();
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random.InitState(unchecked((uint)data.Name.GetHashCode()));
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var root = new Planet
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{
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Random = random,
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Context = context,
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Mass = mass,
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ChildDistanceMaximum = radius,
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ChildDistanceMinimum = context.PlanetRadius(mass)
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};
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// There is some chance of generating a rosette or binary system
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// Probabilities which are fixed for the entire galaxy are in GlobalData, contained in the GameContext
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var rosette = random.NextFloat() < context.GlobalData.RosetteProbability;
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if (rosette)
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{
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// Create a rosette with a number of vertices between 2 and 9 inclusive
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root.ExpandRosette((int)(random.NextFloat(1, 3) * random.NextFloat(2, 3)));
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// Create a small number of less massive "captured" planets orbiting past the rosette
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root.ExpandSolar(
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count: random.NextInt(1,5),
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massMulMin: .6f,
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massMulMax: .8f,
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distMulMin: 1.25f,
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distMulMax: 1.75f,
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jupiterJump: 1,
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massFraction: .1f);
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var averageChildMass = root.Children.Sum(p => p.Mass) / root.Children.Count;
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foreach(var p in root.Children.Where(c=>c.Mass>context.GlobalData.GasGiantMass))
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{
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var m = p.Mass / averageChildMass;
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// Give each child in the rosette its own mini solar system
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p.ExpandSolar(
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count: (int) (m * 5),
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massMulMin: 0.75f,
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massMulMax: 2.5f,
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distMulMin: 1 + m * .05f,
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distMulMax: 1.05f + m * .15f,
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jupiterJump: random.NextFloat() * random.NextFloat() * 10 + 1,
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massFraction: .5f
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);
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}
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}
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else
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{
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// Create a regular old boring solar system
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root.ExpandSolar(
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count: random.NextInt(5, 15),
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massMulMin: 0.5f,
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massMulMax: 2.0f,
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distMulMin: 1.1f,
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distMulMax: 1.35f,
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jupiterJump: random.NextFloat() * random.NextFloat() * 10 + 1,
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massFraction: .25f
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);
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}
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// Get all children that are above the satellite creation mass floor and not rosette members
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var satelliteCandidates = rosette
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? root.AllPlanets().Where(p => p.Parent != root && p.Mass > context.GlobalData.SatelliteCreationMassFloor)
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: root.AllPlanets().Where(p => p.Mass > context.GlobalData.SatelliteCreationMassFloor);
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foreach (var planet in satelliteCandidates)
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{
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// There's a chance of generating satellites for each qualified planet
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if (random.NextFloat() < context.GlobalData.SatelliteCreationProbability)
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{
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// Sometimes the satellite is so massive that it forms a binary system (like Earth!)
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if(random.NextFloat() < context.GlobalData.BinaryCreationProbability)
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planet.ExpandRosette(2);
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// Otherwise, terrestrial planets get a couple satellites while gas giants get many
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else planet.ExpandSolar(
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count: planet.Mass < context.GlobalData.GasGiantMass ? random.NextInt(1,3) : random.NextInt(4,10),
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massMulMin: .75f,
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massMulMax: 1.5f,
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distMulMin: 1.05f,
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distMulMax: 1.25f,
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jupiterJump: 1,
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massFraction: .15f); // Planetary satellites are not nearly as massive as planets themselves
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}
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}
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return root.AllPlanets().ToArray();
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}
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}
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// All orbiting bodies are referred to here as "Planets"
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// This goes back to the original etymology for the word planet, which is traveler,
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// Because they were objects we observed to move in the sky instead of remaining fixed like the stars
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public class Planet
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{
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public Random Random;
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public GameContext Context;
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public float Distance;
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public float Phase;
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public float Mass;
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public float Period;
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public float ChildDistanceMinimum;
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public float ChildDistanceMaximum;
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public bool Empty = false;
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public List<Planet> Children = new List<Planet>(); // Planets orbiting this one are referred to as children
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public Planet Parent;
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// Recursively gather all planets in the hierarchy
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public IEnumerable<Planet> AllPlanets()
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{
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return new[]{this}.Concat(Children.SelectMany(c=>c.AllPlanets()));
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}
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// Create children that fill a single orbit, equally spaced
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// https://en.wikipedia.org/wiki/Klemperer_rosette
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public void ExpandRosette(int vertices)
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{
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// Rosette children replace the parent, parent orbital node is left empty
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Empty = true;
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// Masses in a rosette alternate, so every sequential pair has the same shared mass
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var sharedMass = Mass / vertices * 2;
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// Proportion of the masses of sequential pairs is random, but only for even vertex counts
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var proportion = vertices % 2 == 0 ? Random.NextFloat(.5f,.95f) : .5f;
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// Place children at a fixed distance in the center of the range
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var dist = (ChildDistanceMinimum + ChildDistanceMaximum) / 2;
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// Position of first child
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var p0 = new float2(0, dist);
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// Position of second child
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var p1 = OrbitData.Evaluate(1.0f / vertices) * dist;
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// Maximum child distance is half the distance to the neighbor minus the neighbor's radius
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var p0ChildDist = distance(p0, p1) * proportion - Context.PlanetRadius(sharedMass * (1 - proportion));
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var p1ChildDist = distance(p0, p1) * (1 - proportion) - Context.PlanetRadius(sharedMass * proportion);
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for (int i = 0; i < vertices; i++)
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{
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var child = new Planet
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{
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Random = Random,
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Context = Context,
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Parent = this,
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Mass = sharedMass * (i % 2 == 0 ? proportion : 1 - proportion), // Masses alternate
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Distance = dist,
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Phase = (float) i / vertices,
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ChildDistanceMaximum = (i % 2 == 0 ? p0ChildDist : p1ChildDist)
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};
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child.ChildDistanceMinimum = Context.PlanetRadius(child.Mass) * 2;
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child.Period = child.Distance * child.Distance / 100;
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Children.Add(child);
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}
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ChildDistanceMinimum = dist + p0ChildDist;
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}
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// Create children that mimic the distribution of planetary masses in the solar system
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public void ExpandSolar(int count, float massMulMin, float massMulMax, float distMulMin, float distMulMax, float jupiterJump, float massFraction)
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{
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// Expansion is impossible when child space is full
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if (count == 0 || ChildDistanceMaximum < ChildDistanceMinimum)
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return;
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var masses = new float[count];
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var distances = new float[count];
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// Accumulate total mass
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// Initialize first mass and distance, actual number doesn't matter since total mass will be divided proportionally
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float massTotal = distances[0] = masses[0] = 1;
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// Masses and distances multiply from one planet to the next
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// Mass typically increases exponentially as you go further out
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// jupiterJump is an additional mass multiplier applied after half of the planets
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for (var i = 1; i < count; i++)
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{
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massTotal += masses[i] = masses[i - 1] * Random.NextFloat(massMulMin, massMulMax) * (count/2==i ? jupiterJump : 1);
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distances[i] = distances[i - 1] * Random.NextFloat(distMulMin, distMulMax);
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}
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// Add some randomness to child masses
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for (var i = 0; i < masses.Length; i++)
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masses[i] *= Random.NextFloat(.1f, 1f);
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// Normalize the masses of the children
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for (var i = 0; i < count; i++)
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masses[i] = masses[i] / massTotal * Mass * massFraction;
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// Map child distances to range between minimum and maximum
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if (count > 1)
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{
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var oldDistances = (float[]) distances.Clone();
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for (var i = 0; i < count; i++)
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distances[i] = lerp(ChildDistanceMinimum, ChildDistanceMaximum,
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(oldDistances[i] - oldDistances[0]) / (oldDistances[count - 1] - oldDistances[0])) + Context.PlanetRadius(masses[i]);
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}
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for (var i = 0; i < count; i++)
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{
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// Only instantiate children above the mass floor
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if (masses[i] > Context.GlobalData.MassFloor)
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{
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var child = new Planet
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{
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Random = Random,
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Context = Context,
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Parent = this,
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Mass = masses[i],
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Distance = distances[i],
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Phase = Random.NextFloat()
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};
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child.Period = child.Distance * child.Distance / 100;
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child.ChildDistanceMinimum = Context.PlanetRadius(child.Mass) * 2;
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// Maximum child distance of child is the smallest distance to either of its neighbors
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child.ChildDistanceMaximum = min(i == 0 ? child.Distance - ChildDistanceMinimum : child.Distance - distances[i - 1],
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i < count - 1 ? distances[i + 1] - child.Distance : float.PositiveInfinity);
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if (float.IsNaN(child.Distance))
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throw new NotFiniteNumberException($"Planet created with NaN distance, something went very wrong!");
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if (child.ChildDistanceMaximum > child.ChildDistanceMinimum)
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Children.Add(child);
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}
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}
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}
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} |