replace most systems with THREE

src/game.js

@@ -1,25 +1,31 @@
-import { System } from 'detect-collisions'
 import { EventEmitter } from 'node:events'
 
 export default class Game {
-  entities = []
   tickRate = 30
   currentTick = 0
+  width = 15000
+  height = 15000
 
+  #entities = []
   #eventEmitter = new EventEmitter()
-  #system = new System()
   #tickBudget = Math.floor(1000 / this.tickRate)
 
+  get entities() { return this.#entities }
   get eventEmitter() { return this.#eventEmitter }
-  get system() { return this.#system }
   get tickBudget() { return this.#tickBudget }
 
   spawn_entity(entity) {
-    this.entities.push(entity)
-    this.#system.insert(entity.collider)
+    this.#entities.push(entity)
     entity.game = this
   }
 
+  state() {
+    return {
+      ...this,
+      entities: this.#entities.map((e) => e.state()),
+    }
+  }
+
   async start() {
     const start = performance.now()
     await this.update()
@@ -27,7 +33,7 @@ export default class Game {
   }
 
   async update() {
-    Promise.allSettled(this.entities.map((e) => e.update()))
+    Promise.allSettled(this.#entities.map((e) => e.update()))
     this.currentTick++
     this.eventEmitter.emit('tick')
   }