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feat: migrate simulation to physically-based unit system

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Replace arbitrary game units with real-world measurements throughout
the simulation and viewer: planet orbits in AU, sizes in km, galaxy
positions in light-years. Add SimulationUnits helpers for conversions,
separate WarpSpeed from FtlSpeed for ships, fix FTL transit progress
to use galaxy-space distances, overhaul Lagrange point placement with
Hill sphere approximation, and update the viewer to scale and format
all distances correctly. Ships in FTL transit now render in galaxy view.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Jonathan Bourdon
2026-03-16 14:21:20 -04:00
parent 5ba1287f85
commit 5df5111463
34 changed files with 1558 additions and 456 deletions
Download Patch File Download Diff File Expand all files Collapse all files

82
apps/backend/Simulation/ScenarioLoader.Generation.cs
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@@ -115,9 +115,9 @@ public sealed partial class ScenarioLoader
var compactPositions = new[]
{
new[] { 0f, 0f, 0f },
new[] { 2600f, 24f, -420f },
new[] { -2400f, -36f, 560f },
new[] { 520f, 42f, 2480f },
new[] { 2.6f, 0.02f, -0.42f },
new[] { -2.4f, -0.04f, 0.56f },
new[] { 0.52f, 0.04f, 2.48f },
};
for (var index = 0; index < systems.Count && index < compactPositions.Length; index += 1)
@@ -165,9 +165,9 @@ public sealed partial class ScenarioLoader
AsteroidField = new AsteroidFieldDefinition
{
DecorationCount = template.AsteroidField.DecorationCount + ((generatedIndex % 5) * 10),
RadiusOffset = template.AsteroidField.RadiusOffset + ((generatedIndex % 4) * 18f),
RadiusVariance = template.AsteroidField.RadiusVariance + ((generatedIndex % 3) * 12f),
HeightVariance = template.AsteroidField.HeightVariance + ((generatedIndex % 4) * 4f),
RadiusOffset = template.AsteroidField.RadiusOffset + ((generatedIndex % 4) * 18000f),
RadiusVariance = template.AsteroidField.RadiusVariance + ((generatedIndex % 3) * 12000f),
HeightVariance = template.AsteroidField.HeightVariance + ((generatedIndex % 4) * 4000f),
},
ResourceNodes = resourceNodes,
Planets = planets,
@@ -287,14 +287,14 @@ public sealed partial class ScenarioLoader
private static Vector3 ComputeGeneratedSystemPosition(int generatedIndex, int attempt)
{
const int armCount = 4;
const float baseInnerRadius = 9000f;
const float radiusStep = 540f;
const float baseInnerRadius = 9f;
const float radiusStep = 0.54f;
const float armOffset = MathF.PI * 2f / armCount;
var armIndex = (generatedIndex + attempt) % armCount;
var armDepth = generatedIndex / armCount;
var radius = baseInnerRadius + (armDepth * radiusStep) + Jitter(generatedIndex * 17 + attempt, 0, 900f);
var angle = (armIndex * armOffset) + (radius / 8200f) + Jitter(generatedIndex, 1 + attempt, 0.16f);
var radius = baseInnerRadius + (armDepth * radiusStep) + Jitter(generatedIndex * 17 + attempt, 0, 0.9f);
var angle = (armIndex * armOffset) + (radius / 8.2f) + Jitter(generatedIndex, 1 + attempt, 0.16f);
var x = MathF.Cos(angle) * radius;
var z = MathF.Sin(angle) * radius * 0.58f;
var y = ComputeSystemHeight(radius, generatedIndex, attempt);
@@ -304,9 +304,9 @@ public sealed partial class ScenarioLoader
private static Vector3 ComputeFallbackGeneratedSystemPosition(int generatedIndex)
{
const int ringCount = 5;
const float fallbackRadius = 42000f;
const float fallbackRadius = 42f;
var angle = (generatedIndex % ringCount) * (MathF.PI * 2f / ringCount) + (generatedIndex / ringCount) * 0.22f;
var radius = fallbackRadius + (generatedIndex / ringCount) * 1800f;
var radius = fallbackRadius + (generatedIndex / ringCount) * 1.8f;
return new Vector3(
MathF.Cos(angle) * radius,
ComputeSystemHeight(radius, generatedIndex, 99),
@@ -334,7 +334,7 @@ public sealed partial class ScenarioLoader
{
SourceKind = "asteroid-belt",
Angle = ((MathF.PI * 2f) / nodeCount) * index + Jitter(generatedIndex, 180 + index, 0.22f),
RadiusOffset = 120f + Jitter(generatedIndex, 200 + index, 36f),
RadiusOffset = 120000f + Jitter(generatedIndex, 200 + index, 36000f),
InclinationDegrees = Jitter(generatedIndex, 280 + index, 12f),
AnchorPlanetIndex = ResolveAsteroidAnchorPlanetIndex(planets),
OreAmount = oreAmount,
@@ -374,7 +374,7 @@ public sealed partial class ScenarioLoader
{
SourceKind = "gas-cloud",
Angle = gasAnchor.OrbitPhaseAtEpoch * (MathF.PI / 180f) + (((MathF.PI * 2f) / nodeCount) * index) + Jitter(generatedIndex, 240 + index, 0.18f),
RadiusOffset = 170f + Jitter(generatedIndex, 260 + index, 44f),
RadiusOffset = 170000f + Jitter(generatedIndex, 260 + index, 44000f),
InclinationDegrees = Jitter(generatedIndex, 320 + index, 10f),
AnchorPlanetIndex = gasAnchorIndex,
OreAmount = gasAmount,
@@ -415,7 +415,7 @@ public sealed partial class ScenarioLoader
{
var planetCount = 2 + (int)MathF.Floor(Hash01(generatedIndex, 2) * 7f);
var planets = new List<PlanetDefinition>(planetCount);
var orbitRadius = 140f + (Hash01(generatedIndex, 3) * 35f);
var orbitRadius = 0.24f + (Hash01(generatedIndex, 3) * 0.12f);
var sourcePlanets = template.Planets.Count > 0 ? template.Planets : null;
for (var index = 0; index < planetCount; index += 1)
@@ -437,13 +437,13 @@ public sealed partial class ScenarioLoader
Shape = profile.Shape,
MoonCount = profile.BaseMoonCount + moonVariance,
OrbitRadius = orbitRadius,
OrbitSpeed = 0.22f / MathF.Sqrt(MathF.Max(1f, orbitRadius / 120f)),
OrbitSpeed = 0.11f / MathF.Sqrt(MathF.Max(orbitRadius * orbitRadius * orbitRadius, 0.02f)),
OrbitEccentricity = orbitEccentricity,
OrbitInclination = orbitInclination,
OrbitLongitudeOfAscendingNode = Hash01(generatedIndex, 120 + index) * 360f,
OrbitArgumentOfPeriapsis = Hash01(generatedIndex, 140 + index) * 360f,
OrbitPhaseAtEpoch = Hash01(generatedIndex, 160 + index) * 360f,
Size = profile.BaseSize + (Hash01(generatedIndex, 50 + index) * 10f),
Size = profile.BaseSize + (Hash01(generatedIndex, 50 + index) * (profile.BaseSize * 0.35f)),
Color = templatePlanet?.Color ?? profile.Color,
Tilt = -0.45f + (Hash01(generatedIndex, 60 + index) * 0.9f),
HasRing = profile.CanHaveRing && Hash01(generatedIndex, 70 + index) > 0.55f,
@@ -493,8 +493,8 @@ public sealed partial class ScenarioLoader
private static float ComputeSystemHeight(float radius, int generatedIndex, int salt)
{
var normalized = MathF.Min(1f, MathF.Max(0f, (radius - 8000f) / 28000f));
var band = 220f + (normalized * 760f);
var normalized = MathF.Min(1f, MathF.Max(0f, (radius - 8f) / 28f));
var band = 0.22f + (normalized * 0.76f);
return (Hash01(generatedIndex, 100 + salt) * 2f - 1f) * band;
}
@@ -528,7 +528,7 @@ public sealed partial class ScenarioLoader
int BaseMoonCount,
bool CanHaveRing)
{
public float OrbitGapMax => OrbitGapMin + 44f;
public float OrbitGapMax => OrbitGapMin + MathF.Max(0.12f, OrbitGapMin * 0.45f);
}
private static SolarSystemDefinition CreateSolSystem()
@@ -546,29 +546,29 @@ public sealed partial class ScenarioLoader
{
Id = "sol",
Label = "Sol",
Position = [18200f, 24f, -11800f],
Position = [18.2f, 0.02f, -11.8f],
StarKind = "main-sequence",
StarCount = 1,
StarColor = "#fff1b8",
StarGlow = "#ffd35a",
StarSize = 58f,
StarSize = 696340f,
GravityWellRadius = 240f,
AsteroidField = new AsteroidFieldDefinition
{
DecorationCount = 240,
RadiusOffset = ScaleSolOrbitRadiusFromAu(2.82f),
RadiusVariance = 180f,
HeightVariance = 22f,
RadiusOffset = 422000000f,
RadiusVariance = 180000000f,
HeightVariance = 22000000f,
},
ResourceNodes =
[
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 0.2f, RadiusOffset = 126f, InclinationDegrees = 4f, AnchorPlanetIndex = 3, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 1.8f, RadiusOffset = 148f, InclinationDegrees = -6f, AnchorPlanetIndex = 3, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 3.5f, RadiusOffset = 138f, InclinationDegrees = 8f, AnchorPlanetIndex = 4, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 5.1f, RadiusOffset = 164f, InclinationDegrees = -5f, AnchorPlanetIndex = 4, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "gas-cloud", Angle = 0.9f, RadiusOffset = 210f, InclinationDegrees = 3f, AnchorPlanetIndex = 4, OreAmount = 1000f, ItemId = "gas", ShardCount = 12 },
new ResourceNodeDefinition { SourceKind = "gas-cloud", Angle = 2.7f, RadiusOffset = 228f, InclinationDegrees = -4f, AnchorPlanetIndex = 5, OreAmount = 1000f, ItemId = "gas", ShardCount = 12 },
new ResourceNodeDefinition { SourceKind = "gas-cloud", Angle = 4.8f, RadiusOffset = 186f, InclinationDegrees = 6f, AnchorPlanetIndex = 6, OreAmount = 1000f, ItemId = "gas", ShardCount = 10 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 0.2f, RadiusOffset = 126000f, InclinationDegrees = 4f, AnchorPlanetIndex = 3, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 1.8f, RadiusOffset = 148000f, InclinationDegrees = -6f, AnchorPlanetIndex = 3, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 3.5f, RadiusOffset = 138000f, InclinationDegrees = 8f, AnchorPlanetIndex = 4, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "asteroid-belt", Angle = 5.1f, RadiusOffset = 164000f, InclinationDegrees = -5f, AnchorPlanetIndex = 4, OreAmount = 1000f, ItemId = "ore", ShardCount = 9 },
new ResourceNodeDefinition { SourceKind = "gas-cloud", Angle = 0.9f, RadiusOffset = 210000f, InclinationDegrees = 3f, AnchorPlanetIndex = 4, OreAmount = 1000f, ItemId = "gas", ShardCount = 12 },
new ResourceNodeDefinition { SourceKind = "gas-cloud", Angle = 2.7f, RadiusOffset = 228000f, InclinationDegrees = -4f, AnchorPlanetIndex = 5, OreAmount = 1000f, ItemId = "gas", ShardCount = 12 },
new ResourceNodeDefinition { SourceKind = "gas-cloud", Angle = 4.8f, RadiusOffset = 186000f, InclinationDegrees = 6f, AnchorPlanetIndex = 6, OreAmount = 1000f, ItemId = "gas", ShardCount = 10 },
],
Planets =
[
@@ -605,7 +605,7 @@ public sealed partial class ScenarioLoader
PlanetType = planetType,
Shape = shape,
MoonCount = moonCount,
OrbitRadius = ScaleSolOrbitRadiusFromAu(orbitRadiusAu),
OrbitRadius = orbitRadiusAu,
OrbitSpeed = ComputeSolOrbitSpeed(orbitRadiusAu),
OrbitEccentricity = orbitEccentricity,
OrbitInclination = orbitInclination,
@@ -614,9 +614,16 @@ public sealed partial class ScenarioLoader
OrbitPhaseAtEpoch = phaseAtEpoch,
Size = planetType switch
{
"gas-giant" => label == "Saturn" ? 66f : 72f,
"ice-giant" => 48f,
_ => label == "Earth" ? 28f : label == "Mars" ? 22f : label == "Venus" ? 26f : 20f,
"gas-giant" => label == "Saturn" ? 58232f : 69911f,
"ice-giant" => label == "Uranus" ? 25362f : 24622f,
_ => label switch
{
"Mercury" => 2440f,
"Venus" => 6052f,
"Earth" => 6371f,
"Mars" => 3390f,
_ => 5000f,
},
},
Color = color,
Tilt = tilt,
@@ -624,9 +631,6 @@ public sealed partial class ScenarioLoader
};
}
private static float ScaleSolOrbitRadiusFromAu(float orbitRadiusAu) =>
MathF.Round(500f * MathF.Pow(orbitRadiusAu, 0.70f));
private static float ComputeSolOrbitSpeed(float orbitRadiusAu)
{
const float earthAngularSpeed = 0.11f;