{
  "description": "Progressive URL strategy for Three.js web-enhanced learning",
  "progression": "foundation → intermediate → advanced → expert",
  "url_categories": {
    "foundation": {
      "description": "Basic Three.js concepts - scene, camera, geometry, materials",
      "iteration_range": "1-5",
      "urls": [
        "https://threejs.org/docs/#manual/en/introduction/Creating-a-scene",
        "https://threejs.org/examples/#webgl_geometry_cube",
        "https://threejs.org/examples/#webgl_animation_keyframes",
        "https://threejs.org/examples/#webgl_materials",
        "https://threejs.org/examples/#webgl_lights_hemisphere"
      ]
    },
    "intermediate": {
      "description": "Textures, controls, particles, groups, advanced geometry",
      "iteration_range": "6-12",
      "urls": [
        "https://threejs.org/examples/#webgl_materials_texture_filters",
        "https://threejs.org/examples/#misc_controls_orbit",
        "https://threejs.org/examples/#webgl_points_waves",
        "https://threejs.org/examples/#webgl_geometries",
        "https://threejs.org/examples/#webgl_loader_gltf",
        "https://threejs.org/examples/#webgl_postprocessing_unreal_bloom",
        "https://threejs.org/examples/#webgl_buffergeometry_custom_attributes_particles"
      ]
    },
    "advanced": {
      "description": "Custom shaders, GLSL, advanced lighting, physics, procedural",
      "iteration_range": "13-18",
      "urls": [
        "https://threejs.org/examples/#webgl_shader",
        "https://threejs.org/examples/#webgl_materials_envmaps",
        "https://threejs.org/examples/#webgl_shader_lava",
        "https://threejs.org/examples/#webgl_gpgpu_birds",
        "https://threejs.org/examples/#webgl_shadowmap",
        "https://threejs.org/examples/#webgl_geometry_terrain"
      ]
    },
    "expert": {
      "description": "WebGPU, ray marching, GPU particles, complex shaders, optimization",
      "iteration_range": "19+",
      "urls": [
        "https://threejs.org/examples/#webgl_shaders_ocean",
        "https://threejs.org/examples/#webgpu_ocean",
        "https://threejs.org/examples/#webgpu_compute_particles",
        "https://threejs.org/examples/#webgl_marchingcubes",
        "https://threejs.org/examples/#webgpu_instance_mesh",
        "https://threejs.org/examples/#webgl_shader_ocean2",
        "https://threejs.org/examples/#webgpu_water",
        "https://threejs.org/examples/#webgl_gpgpu_water"
      ]
    }
  },
  "priming_urls": [
    "https://threejs.org/docs/#manual/en/introduction/Creating-a-scene",
    "https://threejs.org/manual/#en/fundamentals",
    "https://threejs.org/manual/#en/responsive",
    "https://threejs.org/manual/#en/scenegraph",
    "https://threejs.org/manual/#en/materials"
  ],
  "web_search_templates": [
    "three.js {technique} example site:threejs.org",
    "three.js {shader_type} shader tutorial",
    "three.js webgpu {effect} example",
    "three.js performance optimization {technique}",
    "GLSL {effect} shader three.js"
  ],
  "learning_focus_by_level": {
    "foundation": [
      "Scene, camera, renderer setup",
      "Basic geometries and materials",
      "Simple animations",
      "Lighting fundamentals",
      "Camera positioning"
    ],
    "intermediate": [
      "Texture loading and mapping",
      "User controls and interaction",
      "Particle systems",
      "Geometry manipulation",
      "Post-processing effects",
      "Advanced materials"
    ],
    "advanced": [
      "Custom shader programming",
      "Vertex and fragment shaders",
      "Advanced lighting techniques",
      "Procedural generation",
      "Physics simulation",
      "Multi-pass rendering"
    ],
    "expert": [
      "WebGPU API usage",
      "Compute shaders",
      "Complex shader effects",
      "GPU particle systems",
      "Performance optimization",
      "Cutting-edge techniques"
    ]
  },
  "technique_keywords": {
    "geometries": ["BoxGeometry", "SphereGeometry", "PlaneGeometry", "BufferGeometry", "Custom Geometry"],
    "materials": ["MeshBasicMaterial", "MeshStandardMaterial", "ShaderMaterial", "MeshPhongMaterial"],
    "lighting": ["AmbientLight", "DirectionalLight", "PointLight", "SpotLight", "HemisphereLight"],
    "controls": ["OrbitControls", "TrackballControls", "FlyControls", "PointerLockControls"],
    "shaders": ["Vertex Shader", "Fragment Shader", "GLSL", "Uniforms", "Varyings"],
    "effects": ["Bloom", "Water", "Ocean", "Particles", "Sky", "Fog"],
    "advanced": ["WebGPU", "Compute Shader", "Ray Marching", "GPGPU", "Instancing"]
  },
  "inspiration_sources": {
    "ocean_examples": [
      "https://threejs.org/examples/#webgl_shaders_ocean",
      "https://threejs.org/examples/#webgpu_ocean",
      "https://threejs.org/examples/#webgl_shader_ocean2"
    ],
    "shader_examples": [
      "https://threejs.org/examples/#webgl_shader",
      "https://threejs.org/examples/#webgl_shader_lava"
    ],
    "particle_examples": [
      "https://threejs.org/examples/#webgl_points_waves",
      "https://threejs.org/examples/#webgpu_compute_particles"
    ]
  }
}