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.