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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
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10
apps/viewer/src/viewerSceneFactory.ts
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@@ -21,6 +21,8 @@ import {
computeMoonOrbitRadius,
computeMoonRenderRadius,
computePlanetLocalPosition,
scaleLocalScalar,
scaleLocalVector,
starHaloOpacity,
toThreeVector,
} from "./viewerMath";
@@ -100,7 +102,7 @@ export function createConstructionSiteMesh(site: ConstructionSiteSnapshot): Scen
export function createStarCluster(system: SystemSnapshot): SceneNode {
const root = new THREE.Group();
const renderedStarSize = celestialRenderRadius(system.starSize, STAR_RENDER_SCALE, 8, 1.02);
const renderedStarSize = celestialRenderRadius(system.starSize, 0.00018, 0.16, 0.62);
const offsets = system.starCount > 1
? [new THREE.Vector3(-renderedStarSize * 0.55, 0, 0), new THREE.Vector3(renderedStarSize * 0.75, renderedStarSize * 0.08, 0)]
: [new THREE.Vector3(0, 0, 0)];
@@ -131,7 +133,7 @@ export function createStarCluster(system: SystemSnapshot): SceneNode {
export function createPlanetOrbit(planet: PlanetSnapshot): SceneNode {
const points = Array.from({ length: 120 }, (_, index) => {
const phaseDegrees = (index / 120) * 360;
return computePlanetLocalPosition(planet, 0, phaseDegrees);
return scaleLocalVector(computePlanetLocalPosition(planet, 0, phaseDegrees));
});
return createSceneNode(new THREE.LineLoop(
@@ -141,7 +143,7 @@ export function createPlanetOrbit(planet: PlanetSnapshot): SceneNode {
}
export function createPlanetRing(planet: PlanetSnapshot): SceneNode {
const renderedPlanetRadius = celestialRenderRadius(planet.size, PLANET_RENDER_SCALE, 7, 1.06);
const renderedPlanetRadius = celestialRenderRadius(planet.size, 0.00012, 0.03, 0.62);
const ring = new THREE.Mesh(
new THREE.RingGeometry(renderedPlanetRadius * 1.35, renderedPlanetRadius * 2.15, 48),
new THREE.MeshBasicMaterial({
@@ -161,7 +163,7 @@ export function createMoonVisuals(planet: PlanetSnapshot, seed: number): MoonVis
const moons: MoonVisual[] = [];
for (let moonIndex = 0; moonIndex < moonCount; moonIndex += 1) {
const orbitRadius = computeMoonOrbitRadius(planet, moonIndex, seed);
const orbitRadius = scaleLocalScalar(computeMoonOrbitRadius(planet, moonIndex, seed));
const orbit = new THREE.LineLoop(
new THREE.BufferGeometry().setFromPoints(
Array.from({ length: 48 }, (_, index) => {