ModelTranslator: Unity asset templates (texture/material/model meta) with GUID reuse
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ud18010
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"""Unity 资产（.meta / .mat）文本模板与 GUID 管理。纯 stdlib，可独立测试。"""
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import os
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import re
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import uuid
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XPBR_SHADER_GUID = "cab897163f45445fa34263d6670bfc9e" # Client/Assets/Game/shader/XShader/XPbr.shader.meta
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_GUID_RE = re.compile(r"^guid: ([0-9a-f]{32})", re.M)
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def new_guid():
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return uuid.uuid4().hex
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def guid_for(asset_path):
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"""资产已有 .meta 则复用其中 guid（重复转换不破坏 Unity 引用），否则新分配。"""
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meta = asset_path + ".meta"
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if os.path.isfile(meta):
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with open(meta, "r", encoding="utf-8") as f:
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m = _GUID_RE.search(f.read())
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if m:
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return m.group(1)
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return new_guid()
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def safe_name(name):
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return re.sub(r"[^0-9A-Za-z_\-]", "_", name).strip("_") or "mat"
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def texture_meta(guid, srgb, max_size):
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return """fileFormatVersion: 2
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guid: {guid}
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TextureImporter:
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internalIDToNameTable: []
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externalObjects: {{}}
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serializedVersion: 12
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mipmaps:
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mipMapMode: 0
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enableMipMap: 1
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sRGBTexture: {srgb}
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linearTexture: 0
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fadeOut: 0
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borderMipMap: 0
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mipMapsPreserveCoverage: 0
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alphaTestReferenceValue: 0.5
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mipMapFadeDistanceStart: 1
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mipMapFadeDistanceEnd: 3
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bumpmap:
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convertToNormalMap: 0
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externalNormalMap: 0
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heightScale: 0.25
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normalMapFilter: 0
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flipGreenChannel: 0
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isReadable: 0
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streamingMipmaps: 0
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streamingMipmapsPriority: 0
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vTOnly: 0
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ignoreMipmapLimit: 0
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grayScaleToAlpha: 0
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generateCubemap: 6
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cubemapConvolution: 0
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seamlessCubemap: 0
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textureFormat: 1
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maxTextureSize: {max_size}
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textureSettings:
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serializedVersion: 2
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filterMode: 1
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aniso: 1
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mipBias: 0
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wrapU: 0
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wrapV: 0
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wrapW: 0
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nPOTScale: 1
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lightmap: 0
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compressionQuality: 50
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spriteMode: 0
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spriteExtrude: 1
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spriteMeshType: 1
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alignment: 0
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spritePivot: {{x: 0.5, y: 0.5}}
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spritePixelsToUnits: 100
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spriteBorder: {{x: 0, y: 0, z: 0, w: 0}}
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spriteGenerateFallbackPhysicsShape: 1
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alphaUsage: 1
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alphaIsTransparency: 0
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spriteTessellationDetail: -1
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textureType: 0
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textureShape: 1
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singleChannelComponent: 0
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flipbookRows: 1
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flipbookColumns: 1
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maxTextureSizeSet: 0
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compressionQualitySet: 0
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textureFormatSet: 0
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ignorePngGamma: 0
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applyGammaDecoding: 0
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swizzle: 50462976
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cookieLightType: 0
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platformSettings:
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- serializedVersion: 3
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buildTarget: DefaultTexturePlatform
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maxTextureSize: {max_size}
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resizeAlgorithm: 0
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textureFormat: -1
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textureCompression: 1
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compressionQuality: 50
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crunchedCompression: 0
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allowsAlphaSplitting: 0
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overridden: 0
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ignorePlatformSupport: 0
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androidETC2FallbackOverride: 0
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forceMaximumCompressionQuality_BC6H_BC7: 0
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spriteSheet:
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serializedVersion: 2
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sprites: []
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outline: []
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physicsShape: []
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bones: []
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spriteID:
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internalID: 0
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vertices: []
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indices:
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edges: []
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weights: []
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secondaryTextures: []
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nameFileIdTable: {{}}
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mipmapLimitGroupName:
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pSDRemoveMatte: 0
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userData:
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assetBundleName:
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assetBundleVariant:
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""".format(guid=guid, srgb=1 if srgb else 0, max_size=max_size)
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def material_yaml(name, shader_guid, base_tex_guid, mix_tex_guid, alpha_test):
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keywords = "\n - _ALPHATEST_ON" if alpha_test else " []"
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return """%YAML 1.1
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%TAG !u! tag:unity3d.com,2011:
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--- !u!21 &2100000
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Material:
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serializedVersion: 8
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m_ObjectHideFlags: 0
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m_CorrespondingSourceObject: {{fileID: 0}}
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m_PrefabInstance: {{fileID: 0}}
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m_PrefabAsset: {{fileID: 0}}
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m_Name: {name}
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m_Shader: {{fileID: 4800000, guid: {shader_guid}, type: 3}}
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m_Parent: {{fileID: 0}}
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m_ModifiedSerializedProperties: 0
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m_ValidKeywords:{keywords}
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m_InvalidKeywords: []
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m_LightmapFlags: 4
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m_EnableInstancingVariants: 0
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m_DoubleSidedGI: 0
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m_CustomRenderQueue: -1
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stringTagMap: {{}}
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disabledShaderPasses: []
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m_LockedProperties:
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m_SavedProperties:
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serializedVersion: 3
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m_TexEnvs:
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- _MainTex:
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m_Texture: {{fileID: 2800000, guid: {base_tex_guid}, type: 3}}
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m_Scale: {{x: 1, y: 1}}
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m_Offset: {{x: 0, y: 0}}
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- _MixTex:
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m_Texture: {{fileID: 2800000, guid: {mix_tex_guid}, type: 3}}
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m_Scale: {{x: 1, y: 1}}
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m_Offset: {{x: 0, y: 0}}
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m_Ints: []
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m_Floats:
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- _AO: 1
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- _AlphaTest: {alpha_test}
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- _Cutoff: 0.5
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- _Metallic: 1
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- _Roughness: 1
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m_Colors:
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- _BaseColor: {{r: 1, g: 1, b: 1, a: 1}}
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m_BuildTextureStacks: []
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""".format(name=name, shader_guid=shader_guid, base_tex_guid=base_tex_guid,
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mix_tex_guid=mix_tex_guid, keywords=keywords,
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alpha_test=1 if alpha_test else 0)
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def material_meta(guid):
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return """fileFormatVersion: 2
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guid: {guid}
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NativeFormatImporter:
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externalObjects: {{}}
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mainObjectFileID: 2100000
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userData:
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assetBundleName:
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assetBundleVariant:
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""".format(guid=guid)
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def model_meta(guid, material_remaps):
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"""material_remaps: [(fbx 内材质名, mat 文件 guid), ...]"""
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if material_remaps:
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ext = "externalObjects:\n"
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for mat_name, mat_guid in material_remaps:
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ext += (" - first:\n"
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" type: UnityEngine:Material\n"
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" assembly: UnityEngine.CoreModule\n"
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" name: {n}\n"
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" second: {{fileID: 2100000, guid: {g}, type: 2}}\n"
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).format(n=mat_name, g=mat_guid)
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else:
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ext = "externalObjects: {}\n"
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return """fileFormatVersion: 2
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guid: {guid}
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ModelImporter:
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serializedVersion: 22200
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internalIDToNameTable: []
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{ext} materials:
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materialImportMode: 2
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materialName: 0
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materialSearch: 1
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materialLocation: 1
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animations:
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legacyGenerateAnimations: 4
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bakeSimulation: 0
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resampleCurves: 1
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optimizeGameObjects: 0
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removeConstantScaleCurves: 0
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motionNodeName:
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animationImportErrors:
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animationImportWarnings:
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animationRetargetingWarnings:
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animationDoRetargetingWarnings: 0
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importAnimatedCustomProperties: 0
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importConstraints: 0
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animationCompression: 1
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animationRotationError: 0.5
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animationPositionError: 0.5
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animationScaleError: 0.5
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animationWrapMode: 0
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extraExposedTransformPaths: []
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extraUserProperties: []
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clipAnimations: []
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isReadable: 0
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meshes:
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lODScreenPercentages: []
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globalScale: 1
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meshCompression: 0
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addColliders: 0
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useSRGBMaterialColor: 1
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sortHierarchyByName: 1
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importPhysicalCameras: 1
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importVisibility: 1
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importBlendShapes: 1
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importCameras: 1
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importLights: 1
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nodeNameCollisionStrategy: 1
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fileIdsGeneration: 2
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swapUVChannels: 0
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generateSecondaryUV: 0
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useFileUnits: 1
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keepQuads: 0
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weldVertices: 1
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bakeAxisConversion: 0
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preserveHierarchy: 0
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skinWeightsMode: 0
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maxBonesPerVertex: 4
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minBoneWeight: 0.001
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optimizeBones: 1
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meshOptimizationFlags: -1
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indexFormat: 0
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secondaryUVAngleDistortion: 8
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secondaryUVAreaDistortion: 15.000001
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secondaryUVHardAngle: 88
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secondaryUVMarginMethod: 1
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secondaryUVMinLightmapResolution: 40
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secondaryUVMinObjectScale: 1
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secondaryUVPackMargin: 4
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useFileScale: 1
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strictVertexDataChecks: 0
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tangentSpace:
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normalSmoothAngle: 60
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normalImportMode: 0
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tangentImportMode: 3
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normalCalculationMode: 4
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legacyComputeAllNormalsFromSmoothingGroupsWhenMeshHasBlendShapes: 0
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blendShapeNormalImportMode: 1
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normalSmoothingSource: 0
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referencedClips: []
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importAnimation: 1
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humanDescription:
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serializedVersion: 3
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human: []
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skeleton: []
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armTwist: 0.5
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foreArmTwist: 0.5
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upperLegTwist: 0.5
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legTwist: 0.5
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armStretch: 0.05
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legStretch: 0.05
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feetSpacing: 0
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globalScale: 1
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rootMotionBoneName:
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hasTranslationDoF: 0
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hasExtraRoot: 0
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skeletonHasParents: 1
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lastHumanDescriptionAvatarSource: {{instanceID: 0}}
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autoGenerateAvatarMappingIfUnspecified: 1
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animationType: 2
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humanoidOversampling: 1
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avatarSetup: 0
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addHumanoidExtraRootOnlyWhenUsingAvatar: 1
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importBlendShapeDeformPercent: 1
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remapMaterialsIfMaterialImportModeIsNone: 0
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additionalBone: 0
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userData:
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assetBundleName:
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assetBundleVariant:
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""".format(guid=guid, ext=ext)
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