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Trojan swarms: a belt on a copy of its host's rail whose rocks ride the rail's period

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Rulings trojans-first, trojans-ride-host-period-with-stations. AsteroidBeltData
key 11 RidesRail; AsteroidBelt.Extent is the one belt extent rule (replaces
Zone's inline farthest-rock loop and the Math.Max at the well node); a swarm's
Periods are its rail's period. The generator draws swarms from a stream of its
own (TrojanStream), so no other draw in the zone moves. Tuning defaults are the
spec's proposals; the code default TrojanProbability 0 draws none. Existing
annulus tests skip swarm rails. Builds.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Meta Vens 2026-10-18 16:28:42 +02:00
commit 92d6153c2e
7 changed files with 83 additions and 19 deletions
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44
Assets/Scripts/ServerShared/ZoneGenerator.cs
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@ -49,7 +49,8 @@ public static class ZoneGenerator
var pack = new ZonePack();
var cache = itemManager.ItemData;
var random = new Random(galaxyZone.Name.StableHash() ^ (uint) pcg3d(galaxyZone.Position).x);
var seed = galaxyZone.Name.StableHash() ^ (uint) pcg3d(galaxyZone.Position).x;
var random = new Random(seed);
var density = saturate(galaxy.Background.CloudDensity(galaxyZone.Position)/2);
pack.Radius = zoneSettings.ZoneRadius.Evaluate(density);
@ -214,6 +215,29 @@ public static class ZoneGenerator
return cache.Upsert(planetData);
}).ToList();
// Trojan swarms (rulings trojans-first, trojans-ride-host-period-with-stations): a belt on a copy of its host's rail, its
// rocks round both L4 and L5. Drawn from a stream of its own, so no other draw in the zone moves; not a GeneratorPlanet,
// so it takes no slot and no station candidacy sees it.
var swarmRandom = new Random(seed ^ TrojanStream);
foreach (var host in planets.Where(p => p.Parent != null && !p.Parent.Empty && !p.Empty && !p.Belt && p.Distance > 0
&& p.Mass > zoneSettings.PlanetMass && p.Mass <= zoneSettings.SunMass))
{
if (swarmRandom.NextFloat() >= zoneSettings.TrojanProbability) continue;
var hostOrbit = orbitMap[host];
var rail = new OrbitData { Parent = hostOrbit.Parent, Distance = hostOrbit.Distance, Phase = hostOrbit.Phase };
pack.Orbits.Add(cache.Upsert(rail));
var swarm = new AsteroidBeltData
{
Orbit = cache.RefOf(rail), RidesRail = true,
Asteroids = TrojanRocks(zoneSettings, ref swarmRandom, rail.Distance, rail.Phase)
};
BodyData swarmBody = swarm;
var swarmKey = cache.Upsert(swarmBody).Key;
swarm.Name = swarmKey.Value.Substring(0, 8);
FieldKinds.Ensure(swarmKey, swarm, cache);
pack.Planets.Add(cache.Upsert(swarmBody));
}
// The generator's own well tree, for clearance only (the Zone builds its own): what a rail must stay out of is the body's
// support, or its Roche margin if more.
var wellNodes = planets.Select(p => new WellNode(cache.RefOf(orbitMap[p]).Key, p.Parent == null ? default : cache.RefOf(orbitMap[p.Parent]).Key,
@ -577,6 +601,24 @@ public static class ZoneGenerator
// limits out; a massive child of a body also far enough that its own pull peak beats CuspMargin times its parent's pull there;
// siblings sit SiblingSpacing of a reach apart. Every other number is a GravityField constant.
public const float RocheMargin = 1.5f;
private const uint TrojanStream = 0x9E3779B9u;
// A swarm's rocks: alternately round L4 and L5 of the rail at `distance` and `phase`, each within half an arc of its point
// along the orbit and a half-width of the rail across it, thickest at the point.
public static Asteroid[] TrojanRocks(ZoneGenerationSettings settings, ref Random random, float distance, float phase)
{
var rocks = new Asteroid[2 * (int) settings.TrojanCount.Evaluate(distance)];
for (var i = 0; i < rocks.Length; i++)
rocks[i] = new Asteroid
{
Distance = distance * (1 + random.NextFloat() * (random.NextFloat() - .5f) * 2 * settings.TrojanHalfWidth),
Phase = frac(phase + (i % 2 == 0 ? 1f : -1f) / 6f + random.NextFloat() * (random.NextFloat() - .5f) * settings.TrojanArc),
Size = random.NextFloat(),
RotationSpeed = settings.AsteroidRotationSpeed.Evaluate(random.NextFloat())
};
return rocks;
}
public const float CuspMargin = 1.5f;
public const float SiblingSpacing = .5f;