feat: initialize sunrise with 100-player shared rooms

tests/precipitation.test.ts

@@ -0,0 +1,47 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { Vector3 } from 'three';
+import { createPrecipitation } from '../src/scene/precipitation.ts';
+
+test('more precipitation draws more particles; mixed weather animates both and dry weather stops', (t) => {
+  t.mock.method(Math, 'random', () => 0.5);
+  const effect = createPrecipitation(() => -100);
+  const camera = new Vector3(0, 10, 0);
+  const [rain, snow] = effect.group.children as any[];
+  try {
+    assert.equal(effect.update(0, camera, 0, 0, 1, 600), false);
+    effect.update(0, camera, 0.2, 0, 1, 600);
+    const light = rain.geometry.drawRange.count;
+    assert.ok(light > 0);
+    assert.equal(snow.visible, false);
+    const before = rain.geometry.attributes.position.getY(0);
+    effect.update(0.01, camera, 0.2, 0, 1, 600);
+    assert.ok(rain.geometry.attributes.position.getY(0) < before);
+    assert.equal(effect.update(0.01, camera, 15, 2, 1, 600), true);
+    assert.ok(rain.geometry.drawRange.count > light);
+    assert.ok(snow.visible && snow.geometry.drawRange.count > 0);
+    const snowBefore = snow.geometry.attributes.position.getY(0);
+    effect.update(0.01, camera, 15, 2, 1, 600);
+    assert.ok(snow.geometry.attributes.position.getY(0) < snowBefore);
+    assert.equal(effect.update(0.01, camera, 0, 0, 1, 600), false);
+    assert.equal(rain.visible || snow.visible, false);
+  } finally { effect.dispose(); }
+});
+
+test('particles follow camera teleports and stay above the sampled ground', () => {
+  const effect = createPrecipitation(() => 3);
+  const camera = new Vector3(0, 10, 0);
+  try {
+    effect.update(0, camera, 8, 1, 1, 600);
+    camera.set(1000, 20, -1000);
+    effect.update(0.01, camera, 8, 1, 1, 600);
+    for (const mesh of effect.group.children as any[]) {
+      const positions = mesh.geometry.attributes.position;
+      for (let i = 0; i < mesh.geometry.drawRange.count; i++) {
+        assert.ok(Math.abs(positions.getX(i) - camera.x) < 25);
+        assert.ok(Math.abs(positions.getZ(i) - camera.z) < 25);
+        assert.ok(positions.getY(i) >= 3);
+      }
+    }
+  } finally { effect.dispose(); }
+});