茂之钳
8be2f0ba0a
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feat(v4.5): draft analysis + incremental mesh + kinematic chain solvers
M1 — Draft Analysis (拔模分析):
- draft_angle(face, pull_dir): compute draft angle from NURBS surface normal
- analyze_draft(body, pull_dir, min_angle): full-model analysis with face classification
- DraftFaceType: Positive/Negative/ZeroDraft/Undercut with area-weighted stats
- draft_report(): human-readable moldability report
- create_draft_face / apply_draft: face rotation stubs (needs mutable surface access)
M2 — Incremental Mesh (增量网格):
- IncrementalMesher: face_id → mesh fragment mapping with dirty tracking
- invalidate_face / rebuild_dirty / rebuild_all: targeted remeshing
- merged_mesh(): combine clean face meshes into single HalfedgeMesh
- Cache statistics: hit rate + memory estimation
M3 — Kinematic Chain (运动链求解):
- FourBarLinkage: Grashof classification + Freudenstein position solver
- GearPair/GearTrain: ratio-based transmission solver with multi-stage support
- CamFollower: 5 motion types (Dwell/CV/SHM/Cycloidal/3-4-5 Polynomial)
- Full-cycle analysis for all solvers
7 new files, ~1400 lines of header + implementation
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