feat: LOD 网格分级——meshopt 解析期简化 + 按距离/级联选级
vendored meshoptimizer 1.2（submodule 环境故障改直接 vendor）。Mesh 多 LOD：各级索引连续拼进同一 index buffer（共享顶点，LodRange 区间 选择），解析期 meshopt_simplify 生成链（LOD0=原始，每级目标减半， 相对误差 1e-2，小网格复用上级）；都在 worker 线程，加载零额外卡顿。 SceneRenderer 按 (mesh, LOD) 聚合 batch（lookup key = 指针<<8|lod）： 主视图按屏占比近似 radius/dist 选级（阈值 10/20 倍半径）；阴影级联 按级联序降级（越远越简）。Draw 按 batch.lod 选索引区间。 A/B 对比（100 背包 10×10，RTX 5060 Laptop，vsync off）： - 纯背包：LOD 开 93-95 fps / 关 90-107 fps —— 无显著差异 - 加 SunTemple：LOD 开 52-56 / 关 51-55 —— 无显著差异 结论：当前场景瓶颈不在顶点数（5060 顶点吞吐富余），LOD 基础设施 保留（几何复杂资产/低端 GPU/更大场景生效），帧率问题转向 Tracy GPU 时间线定位真实瓶颈。 坑：LodRange 记录"LOD 不足复用最后一级"时 first 不得继续累加 （buffer 无重复数据，累加必越界——VUID-08798 抓的）。
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#
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# AFL dictionary for JSON
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# -----------------------
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#
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# Just the very basics.
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#
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# Inspired by a dictionary by Jakub Wilk <jwilk@jwilk.net>
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#
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"0"
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"\\uDBFF\\uDFFF"
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"\"\":0"
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"//"
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"/**/"
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#
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# AFL dictionary for GLTF core
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# -----------------------
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"5120"
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"5121"
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"5122"
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"5123"
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"5125"
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"5126"
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"\"mesh\""
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"\"metallicFactor\""
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"\"metallicRoughnessTexture\""
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"\"mimeType\""
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"\"minVersion\""
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"\"min\""
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"\"orthographic\""
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"\"output\""
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"\"path\""
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"\"pbrMetallicRoughness\""
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"\"perspective\""
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"\"primitive\""
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"\"primitives\""
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"\"rotation\""
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"\"roughnessFactor\""
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"\"sampler\""
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"\"samplers\""
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"\"scale\""
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"\"scenes\""
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"\"skin\""
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"\"ymag\""
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"\"zfar\""
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"\"znear\""
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#
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# AFL dictionary for GLTF extensions
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# -----------------------
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"\"KHR_materials_unlit\""
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"\"KHR_draco_mesh_compression\""
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"\"texCoord\""
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"\"color\""
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"\"directional\""
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"\"intensity\""
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"\"light\""
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"\"KHR_materials_transmission\""
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"\"transmissionFactor\""
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"\"transmissionTexture\""
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"\"KHR_materials_volume\""
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"\"thicknessFactor\""
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"\"thicknessTexture\""
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"\"attenuationColor\""
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"\"attenuationDistance\""
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"\"KHR_materials_sheen\""
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"\"sheenColorTexture\""
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"\"sheenRoughnessFactor\""
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"\"sheenRoughnessTexture\""
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"\"KHR_materials_emissive_strength\""
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"\"emissiveStrength\""
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"\"KHR_materials_clearcoat\""
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"\"clearcoatFactor\""
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"\"clearcoatTexture\""
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"\"clearcoatRoughnessFactor\""
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"\"clearcoatRoughnessTexture\""
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"\"clearcoatNormalTexture\""
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"\"KHR_materials_ior\""
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"\"ior\""
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"\"KHR_materials_specular\""
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"\"specularFactor\""
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"\"specularTexture\""
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"\"specularColorFactor\""
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"\"specularColorTexture\""
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"\"KHR_materials_iridescence\""
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"\"iridescenceFactor\""
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"\"iridescenceTexture\""
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"\"iridescenceIor\""
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"\"iridescenceThicknessMinimum\""
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"\"iridescenceThicknessMaximum\""
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"\"iridescenceThicknessTexture\""
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"\"KHR_materials_anisotropy\""
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"\"anisotropyStrength\""
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"\"anisotropyRotation\""
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"\"anisotropyTexture\""
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"\"KHR_materials_dispersion\""
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"\"dispersion\""
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"\"KHR_materials_diffuse_transmission\""
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"\"diffuseTransmissionFactor\""
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"\"diffuseTransmissionTexture\""
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"\"diffuseTransmissionColorFactor\""
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"\"diffuseTransmissionColorTexture\""
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"\"KHR_materials_variants\""
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"\"mappings\""
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"\"targetNames\""
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"\"variants\""
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"\"EXT_texture_webp\""
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"\"EXT_mesh_gpu_instancing\""
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"\"TRANSLATION\""
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"\"ROTATION\""
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"\"SCALE\""
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"\"_COLOR_0\""
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"\"EXT_meshopt_compression\""
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"\"KHR_meshopt_compression\""
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"\"mode\""
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"\"filter\""
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"\"fallback\""
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"\"ATTRIBUTES\""
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"\"TRIANGLES\""
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"\"INDICES\""
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"\"NONE\""
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"\"OCTAHEDRAL\""
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"\"QUATERNION\""
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"\"EXPONENTIAL\""
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"\"COLOR\""
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"\"KHR_mesh_quantization\""
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