weld-seam-normal-vectors
Skill2 starsChanged 6 months agoApache-2.0View on GitHub
焊缝法向量(MasterPlateNormal / SidePlateNormal)的领域知识库。涵盖: (1) 焊接坐标系的构建原理(Z=主板法向, Y=子板法向修正, X=焊接方向); (2) 法向量在焊前规划(WeldPoseSolver)和精定位(MapCalculator / VCM提取)中的完整调用链; (3) 平焊缝 Master/SidePlate 自动校正(swap)机制。 当涉及以下代码修改时使用:WeldSeamVertex 的法向量赋值、WeldCoordinateUtils 坐标系变换、 精定位 MapMatrix 校正、VCM 法向量提取、BuildWeld2Model、DoublePlateWeldPoseSolver、 MasterPlate/SidePlate 分配逻辑、AssignWsgDirection、ParseIntermidiateILs。
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The file
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焊缝法向量领域知识
核心概念
焊接坐标系由两个板面法向量 + 焊接方向定义:
Z 轴 = MasterPlateNormal (主板法向量,应指向工作面外侧)
X 轴 = 焊接方向 (起点到终点)
Y 轴 = Cross(Z, X) 符号由 SidePlateNormal 修正,确保 Y 朝子板一侧这个坐标系是焊枪姿态、多层多道偏移、精定位校正矩阵的基础。
数据结构
WeldSeamVertex
├── Point (3D 位置)
├── MasterPlateNormal (主板法向量 → Z 轴)
├── SidePlateNormal (子板法向量 → Y 轴方向修正)
└── PointType
WeldSeam
├── MasterPlate (WeldPlate: BodyIndex, PlateIndex, FaceIndex)
├── SidePlate (WeldPlate?)
└── WeldSeamVertices[]法向量来源
H-Beam / Flex-Beam(视觉模型工件)
C++ 算法解析 STEP/STL → 提取 PlateFaceSetsInOneWp(面片数据),AssignWsgDirection 从面片的 OriIn3D 矩阵第三行提取法向量,按 MasterPlate/SidePlate 的 (BodyIndex, PlateIndex, FaceIndex) 索引查表赋值。
DoublePlate(重磅板)
解析计算:MasterPlateNormal = plane.ZAxis,SidePlateNormal = 圆心到顶点方向。
C++ 层 Master/Side 分配(不可修改)
ParseIntermidiateILs 中硬编码:BodyPlateFaceIdxs[0:2] → SidePlate,[3:5] → MasterPlate。这个映射由 C++ 算法决定。
平焊缝 Master/SidePlate 自动校正(Swap)
背景
护圈等特殊工件中,C++ 分配的 MasterPlate 法向量与工作面垂直(非同向),而 SidePlateNormal 才与工作面同向。导致 Z 轴方向错误。
实现位置
WorkpieceManagerBase.SwapMasterSidePlateForFlatWelds() — 在 AssignWsgDirection 之后、数据写入 Workpiece 之前调用(仅 FlexBeam)。
判定条件
仅对 Direction == Horizontal 的焊缝组:
|SidePlateNormal · workFaceNormal| > |MasterPlateNormal · workFaceNormal|取绝对值比较,因为法向量可能朝内或朝外。
Swap 操作
同时交换 WeldPlate 对象和法向量:
(ws.SidePlate, ws.MasterPlate) = (ws.MasterPlate, ws.SidePlate);
(vertex.SidePlateNormal, vertex.MasterPlateNormal) = (vertex.MasterPlateNormal, vertex.SidePlateNormal);为什么源头 Swap 安全
所有下游通过 WeldPlate 的 (BodyIndex, PlateIndex, FaceIndex) 引用 MasterPlate。Swap 后索引互换,VCM 匹配等逻辑自动获取正确的平面。无需修改下游。
安全边界
- 仅影响平焊缝(Horizontal),立焊缝不触发
- 包角逻辑在 swap 之前已完成,不受影响
BuildWeld2ModelForV的隐式 swap 仅处理立焊缝,互不干扰DoublePlateWeldPoseSolverManager的MasterPlateNormal * -1仅 DoublePlate 走此路径
关键调用链
详见 references/call-chains.md
已有 Workaround(未移除)
| 位置 | 逻辑 | 适用范围 |
WeldPoseSolverManager.BuildWeld2ModelForV | 行列式 < 0 时 swap Master/Side 法向量 | 仅立焊缝 |
DoublePlateWeldPoseSolverManager | axisZ = MasterPlateNormal * -1 | 仅重磅板 |
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