unreal-modeling-uv

Design

GeometryScript UV 操作。当用户要求生成、投影、布局、变换 UV 或进行 UV 相关处理时使用。

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建模 — UV

前置条件：先阅读 unreal-modeling。

库

CDO：/Script/GeometryScriptingCore.Default__GeometryScriptLibrary_MeshUVFunctions

TargetMesh 为 UDynamicMesh* 路径字符串。UVSetIndex（别名 UVChannel）为 int，通常 0。Debug 省略。需要 FGeometryScriptMeshSelection 的函数，用 MeshOperationLibrary 桥接（见 unreal-modeling）。

主要函数

UV 通道管理

函数	关键参数	说明
`SetNumUVSets`	`TargetMesh`, `NumUVSets`	设置 UV 通道数量
`ClearUVChannel`	`TargetMesh`, `UVChannel`	清空指定 UV 通道
`CopyUVSet`	`TargetMesh`, `FromUVSet`, `ToUVSet`	复制 UV 通道

UV 自动生成

函数	关键参数	说明
`AutoGenerateXAtlasMeshUVs`	`TargetMesh`, `UVSetIndex`, `Options`	XAtlas 自动展开（推荐通用方案）
`AutoGeneratePatchBuilderMeshUVs`	`TargetMesh`, `UVSetIndex`, `Options`	PatchBuilder 自动展开（更多控制）
`RecomputeMeshUVs`	`TargetMesh`, `UVSetIndex`, `Options`, `Selection`	基于已有岛或 Polygroup 重新计算 UV

UV 投影

函数	关键参数	说明
`SetMeshUVsFromPlanarProjection`	`TargetMesh`, `UVSetIndex`, `PlaneTransform`, `Selection`	平面投影。PlaneTransform 的 Scale 定义映射到 1 UV 的世界尺寸
`SetMeshUVsFromBoxProjection`	`TargetMesh`, `UVSetIndex`, `BoxTransform`, `Selection`, `MinIslandTriCount`	盒体投影
`SetMeshUVsFromCylinderProjection`	`TargetMesh`, `UVSetIndex`, `CylinderTransform`, `Selection`, `SplitAngle`	圆柱投影

UV 布局与打包

函数	关键参数	说明
`RepackMeshUVs`	`TargetMesh`, `UVSetIndex`, `RepackOptions`	重新打包 UV 岛
`LayoutMeshUVs`	`TargetMesh`, `UVSetIndex`, `LayoutOptions`, `Selection`	布局 UV（支持多种模式）
`ApplyTexelDensityUVScaling`	`TargetMesh`, `UVSetIndex`, `Options`, `Selection`	按纹素密度缩放 UV

UV 变换

函数	关键参数	说明
`TranslateMeshUVs`	`TargetMesh`, `UVSetIndex`, `Translation`, `Selection`	平移 UV
`ScaleMeshUVs`	`TargetMesh`, `UVSetIndex`, `Scale`, `ScaleOrigin`, `Selection`	缩放 UV
`RotateMeshUVs`	`TargetMesh`, `UVSetIndex`, `RotationAngle`, `RotationOrigin`, `Selection`	旋转 UV（角度制）

UV 查询

函数	关键参数	说明
`GetMeshUVSizeInfo`	`TargetMesh`, `UVSetIndex`, `Selection`	返回 3D 面积、UV 面积、3D 包围盒、UV 包围盒等
`GetMeshPerVertexUVs`	`TargetMesh`, `UVSetIndex`	获取每顶点 UV 列表

UV 传输

函数	关键参数	说明
`TransferMeshUVsByProjection`	`TargetMesh`, `TargetUVChannel`, `TargetSelection`, `TargetTransform`, `SourceMesh`, `SourceMeshOptionalBVH`, `SourceUVChannel`, `SourceSelection`, `SourceTransform`, `Settings`, `ProjectionDirection`	通过投影从源 mesh 传输 UV
`SetUVSeamsAlongSelectedEdges`	`TargetMesh`, `UVChannel`, `Selection`, `bInsertSeams`	沿选中边设置/移除 UV 接缝

UV 底层操作

函数	关键参数	说明
`SetMeshTriangleUVs`	`TargetMesh`, `UVSetIndex`, `TriangleID`, `UVs`	设置单个三角形的 UV
`AddUVElementToMesh`	`TargetMesh`, `UVSetIndex`, `NewUVPosition`	添加 UV 元素
`SetMeshUVElementPosition`	`TargetMesh`, `UVSetIndex`, `ElementID`, `NewUVPosition`	设置 UV 元素位置
`CopyMeshUVLayerToMesh`	`CopyFromMesh`, `UVSetIndex`, `CopyToUVMesh`	将 UV 通道导出为独立 mesh
`CopyMeshToMeshUVLayer`	`CopyFromUVMesh`, `ToUVSetIndex`, `CopyToMesh`	将 mesh 写回 UV 通道

结构体与枚举

`FGeometryScriptRecomputeUVsOptions`

字段	类型	默认值	说明
`Method`	`EGeometryScriptUVFlattenMethod`	`SpectralConformal`	展平算法
`IslandSource`	`EGeometryScriptUVIslandSource`	`UVIslands`	岛来源
`ExpMapOptions`	struct	—	ExpMap 专用选项
`SpectralConformalOptions`	struct	—	SpectralConformal 专用选项
`GroupLayer`	`FGeometryScriptGroupLayer`	默认层	Polygroup 层（当 IslandSource=PolyGroups 时）
`bAutoAlignIslandsWithAxes`	bool	`true`	自动对齐岛到坐标轴

`EGeometryScriptUVFlattenMethod`

值	说明
`ExpMap`	指数映射
`Conformal`	保角映射
`SpectralConformal`	谱保角映射（推荐）

`EGeometryScriptUVIslandSource`

值	说明
`PolyGroups`	按 Polygroup 分岛
`UVIslands`	按已有 UV 岛分岛

`FGeometryScriptXAtlasOptions`

字段	类型	默认值
`MaxIterations`	int	`2`

`FGeometryScriptPatchBuilderOptions`

字段	类型	默认值	说明
`InitialPatchCount`	int	`100`	初始 patch 数量
`MinPatchSize`	int	`2`	最小 patch 大小
`PatchCurvatureAlignmentWeight`	float	`1.0`	曲率对齐权重
`PatchMergingMetricThresh`	float	`1.5`	合并度量阈值
`PatchMergingAngleThresh`	float	`45.0`	合并角度阈值
`bRespectInputGroups`	bool	`false`	尊重输入 Polygroup
`bAutoPack`	bool	`true`	自动打包
`PackingOptions`	`FGeometryScriptRepackUVsOptions`	—	打包选项

`FGeometryScriptRepackUVsOptions`

字段	类型	默认值
`TargetImageWidth`	int	`512`
`bOptimizeIslandRotation`	bool	`true`

`FGeometryScriptLayoutUVsOptions`

字段	类型	默认值	说明
`LayoutType`	`EGeometryScriptUVLayoutType`	`Repack`	布局类型
`TextureResolution`	int	`1024`	纹理分辨率
`Scale`	float	`1`	打包后缩放
`Translation`	FVector2D	`(0,0)`	打包后平移
`bPreserveScale`	bool	`false`	保留岛缩放
`bPreserveRotation`	bool	`false`	保留岛旋转
`bAllowFlips`	bool	`false`	允许翻转

`EGeometryScriptUVLayoutType`

值	说明
`Transform`	应用 Scale/Translation
`Stack`	每个岛独立缩放到单位正方形
`Repack`	集体打包到单位正方形（无重叠）
`Normalize`	归一化纹素密度

JSON 示例

XAtlas 自动展开：

{"object":"/Script/GeometryScriptingCore.Default__GeometryScriptLibrary_MeshUVFunctions","function":"AutoGenerateXAtlasMeshUVs","params":{"TargetMesh":"/Engine/Transient.DynamicMesh_0","UVSetIndex":0,"Options":{"MaxIterations":2}}}

盒体投影：

{"object":"/Script/GeometryScriptingCore.Default__GeometryScriptLibrary_MeshUVFunctions","function":"SetMeshUVsFromBoxProjection","params":{"TargetMesh":"/Engine/Transient.DynamicMesh_0","UVSetIndex":0,"BoxTransform":{"Rotation":{"X":0,"Y":0,"Z":0,"W":1},"Translation":{"X":0,"Y":0,"Z":0},"Scale3D":{"X":100,"Y":100,"Z":100}},"Selection":{},"MinIslandTriCount":2}}

重新计算 UV（SpectralConformal）：

{"object":"/Script/GeometryScriptingCore.Default__GeometryScriptLibrary_MeshUVFunctions","function":"RecomputeMeshUVs","params":{"TargetMesh":"/Engine/Transient.DynamicMesh_0","UVSetIndex":0,"Options":{"Method":"SpectralConformal","IslandSource":"UVIslands","bAutoAlignIslandsWithAxes":true},"Selection":{}}}

发现

对 CDO 路径调用 DescribeObject 可查看完整函数列表和参数签名。