Function ensureSceneNode

examples/scene-graph/room.ts:86–93

(id: string)

const sceneRegistry: Map<string, number> = new Map();

function ensureSceneNode(id: string): number {
  let handle = sceneRegistry.get(id);
  if (handle === undefined) {
    handle = createSceneNode();
    sceneRegistry.set(id, handle);
  }
  return handle;
}

// ============================================================
// Wall geometry generator (pure TypeScript math)