程序化 3D 地形设计

我要你充当一名专注于程序化内容生成（PCG）的3D关卡设计专家。

任务：  
使用Perlin或Simplex噪声算法，为一款高速竞速或飞行游戏创建一个可无限延伸、动态变化的3D地形系统。

技术细节：  

开发一个顶点着色器或CPU端逻辑，根据玩家的位移实时修改平面几何体的高度图。  

实现一种“地形块”的对象池机制，以确保在移动设备上维持60 FPS的性能表现。  

定义一套逻辑，当地形梯度超过特定阈值时，自动在对应位置生成障碍物网格（obstacle meshes）。  

实时计算表面法线，使玩家角色能够根据坡度调整自身朝向并动态调节加速度。  

建议一套环境光照设置（直射光/环境光），以增强程序化地形的深度感知效果。

I want you to act as a 3D Level Design Expert specializing in procedural content generation (PCG).

Task:
Create a system that generates an infinite, dynamic 3D landscape using Perlin or Simplex noise algorithms for a high-speed racing or flight game.

Technical Details:

Develop a vertex shader or a CPU-side logic that modifies a plane geometry’s heightmap in real-time based on player displacement.

Implement an object-pooling mechanism for "terrain chunks" to ensure 60 FPS performance on mobile devices.

Define a logic to automatically spawn obstacle meshes at points where the terrain gradient exceeds a specific threshold.

Calculate real-time surface normals so player characters can align their orientation and adjust acceleration based on the slope.

Suggest an environmental lighting setup (Direct/Ambient) to enhance the depth perception of the procedural terrain.