 茂之钳
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6cfd186780
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feat(brep): S13-A — IGES import support
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Implement IGES (Initial Graphics Exchange Specification) file reader that
converts IGES entities to B-Rep models.
Key features:
- 80-character fixed-width card image parser (S/G/D/P/T sections)
- Directory Entry parsing with all 18 DE fields per entity
- Parameter Data parsing with DE pointer tracking
- D exponent notation support (e.g., 1.5D+2 = 150)
Supported IGES entity types:
Curve entities (→ NurbsCurve):
Type 100 - Circular Arc (rational degree-2)
Type 102 - Composite Curve
Type 104 - Conic Arc (ellipse/hyperbola/parabola)
Type 106 - Copious Data (polyline)
Type 110 - Line (degree-1)
Type 126 - Rational B-Spline Curve
Surface entities (→ NurbsSurface):
Type 108 - Plane
Type 114 - Parametric Spline Surface
Type 118 - Ruled Surface
Type 120 - Surface of Revolution
Type 122 - Tabulated Cylinder (extrude)
Type 128 - Rational B-Spline Surface
Type 140 - Offset Surface
Type 192 - Right Circular Cylindrical Surface
Type 194 - Right Circular Conical Surface
Type 196 - Spherical Surface
Type 198 - Toroidal Surface
Topology entities (→ BrepModel):
Type 186 - Manifold Solid B-Rep Object
Type 502 - Vertex
Type 504 - Edge
Type 508 - Loop
Type 510 - Face
Type 514 - Shell
Tests cover: line, arc, cylinder, sphere, cone, torus, plane,
B-spline curve/surface, ruled surface, revolution surface,
tabulated cylinder, copious data polyline, manifold solid B-Rep,
D exponent notation, empty/truncated file handling, and file errors.
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2026-07-24 07:37:03 +00:00 |
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茂之钳
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4f75bb8b07
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feat(brep): S13-B IGES export + format utilities
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Add IGES v5.3 export for B-Rep models with:
- Entity mapping: Point(116), Line(110), Circular Arc(100),
B-Spline Curve(126), Plane(108), B-Spline Surface(128),
Vertex(502), Edge(504), Loop(508), Face(510), Shell(514),
Manifold Solid B-Rep(186)
- Auto-detection of circular arcs (degree-2 NURBS with
isosceles control triangle) and planes (1x1 degree surfaces)
- Fixed 80-column IGES format with S/G/D/P/T sections
- Header-only format_utils.h for IGES/STEP number formatting
New files:
- include/vde/foundation/format_utils.h
- include/vde/brep/iges_export.h
- src/brep/iges_export.cpp
- tests/brep/test_iges_export.cpp
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2026-07-24 07:34:27 +00:00 |
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茂之钳
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8a19e265cd
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feat(v2.0.0): Sprint 10 — B-Rep完善 + STEP导入/导出 + 布尔运算 + 验证
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S10-A: B-Rep modeling 补齐
- fillet: 恒定半径滚动球倒圆（NURBS 曲面构建 + 相邻面裁剪）
- chamfer: 等距倒角（平面偏移 + 倒角面构建）
- shell: 完整抽壳（顶点偏移 + 内外面 + 开口侧壁）
S10-B: STEP AP203/AP214 导入
- ISO 10303-21 解析器（1,424 行）
- 支持 14 种几何实体 → NurbsCurve/NurbsSurface 转换
- 完整拓扑链：VERTEX_POINT → EDGE_CURVE → EDGE_LOOP → ADVANCED_FACE → CLOSED_SHELL → MANIFOLD_SOLID_BREP
- 装配支持：NEXT_ASSEMBLY_USAGE_OCCURRENCE + CONTEXT_DEPENDENT_SHAPE_REPRESENTATION
S10-C.1: STEP AP214 导出
- export_step / export_step_file
- 曲线/曲面类型自动检测简化输出
S10-C.2: B-Rep 级布尔运算
- brep_union / brep_intersection / brep_difference
- 面-面求交 + 内/外分类 + 面缝合
S10-C.3: B-Rep 工程验证
- ValidationResult: 水密性/悬边/自相交/方向一致性/欧拉示性数
测试: 5 个新测试文件，47 项测试（modeling/STEP导入/导出/布尔/验证）
修改: 7 files (+576/-47) | 新增: 13 files (4,141 行)
总计: +4,670 行
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2026-07-24 05:18:52 +00:00 |
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