File size: 2,787 Bytes
00a81c8 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | import * as THREE from 'three';
export const START_GRID_Y = 0.28;
export const START_GRID_LATERAL_OFFSET = 2.35;
export const START_GRID_ROW_SPACING = 6.0;
export const START_GRID_INITIAL_OFFSET = 8.0;
export const MULTIPLAYER_COUNTDOWN_MS = 3600;
export const START_SYNC_GRACE_MS = 5000;
export const START_SYNC_ANCHOR_TOLERANCE = 24;
export const CENTER_FALLBACK_RADIUS = 18;
const TRACK_POINTS = [
new THREE.Vector3(0, 0, 100),
new THREE.Vector3(50, 0, 90),
new THREE.Vector3(80, 0, 60),
new THREE.Vector3(120, 0, 40),
new THREE.Vector3(120, 0, -20),
new THREE.Vector3(105, 0, -50),
new THREE.Vector3(120, 0, -80),
new THREE.Vector3(120, 0, -140),
new THREE.Vector3(70, 0, -140),
new THREE.Vector3(70, 0, -70),
new THREE.Vector3(10, 0, -70),
new THREE.Vector3(10, 0, -140),
new THREE.Vector3(-40, 0, -140),
new THREE.Vector3(-80, 0, -120),
new THREE.Vector3(-140, 0, -80),
new THREE.Vector3(-150, 0, -20),
new THREE.Vector3(-110, 0, 30),
new THREE.Vector3(-140, 0, 70),
new THREE.Vector3(-90, 0, 110),
new THREE.Vector3(-40, 0, 100),
];
const SHARED_CURVE = new THREE.CatmullRomCurve3(TRACK_POINTS, true, 'centripetal', 0.5);
const SHARED_TRACK_LENGTH = SHARED_CURVE.getLength();
const UP = new THREE.Vector3(0, 1, 0);
function normalizeSlotIndex(slotIndex = 0) {
if (!Number.isFinite(slotIndex)) return 0;
return Math.max(0, Math.floor(slotIndex));
}
export function getStartTransformForSlot(slotIndex = 0) {
const normalizedSlot = normalizeSlotIndex(slotIndex);
const row = Math.floor(normalizedSlot / 2);
const side = normalizedSlot % 2 === 0 ? -1 : 1;
const baseT = (1 - ((row * START_GRID_ROW_SPACING + START_GRID_INITIAL_OFFSET) / SHARED_TRACK_LENGTH) + 1) % 1;
const point = SHARED_CURVE.getPointAt(baseT);
const tangent = SHARED_CURVE.getTangentAt(baseT).normalize();
const lateral = new THREE.Vector3().crossVectors(UP, tangent).normalize();
const heading = Math.atan2(tangent.x, tangent.z);
const position = point.clone().addScaledVector(lateral, side * START_GRID_LATERAL_OFFSET).setY(START_GRID_Y);
return {
slotIndex: normalizedSlot,
progress: baseT,
heading,
position: { x: position.x, y: position.y, z: position.z },
};
}
export function isNearCenterPosition(position, radius = CENTER_FALLBACK_RADIUS) {
if (!position) return true;
const x = Number(position.x ?? 0);
const z = Number(position.z ?? 0);
return Number.isFinite(x) && Number.isFinite(z) ? Math.hypot(x, z) <= radius : true;
}
export function distanceBetweenPositions(a, b) {
if (!a || !b) return Number.POSITIVE_INFINITY;
const dx = Number(a.x ?? 0) - Number(b.x ?? 0);
const dy = Number(a.y ?? 0) - Number(b.y ?? 0);
const dz = Number(a.z ?? 0) - Number(b.z ?? 0);
return Math.hypot(dx, dy, dz);
}
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