Brain: profile_assembly.py now exports 'rib_web' — the actual material
geometry from Shapely boolean (exterior + interior rings). This is the
rib shape, not the pocket cutouts.
import_profile.py: prefers rib_web when available, drawing exterior +
interior polyline rings directly. Falls back to pocket-based drawing
for older rib JSONs without rib_web.
Cross product of (start-center) × (end-center) is zero for 180° arcs,
causing random clockwise assignment. Now samples actual midpoint via
UF Eval at t_mid, stores as 'mid' in JSON. Import prefers 'mid' over
computed clockwise direction.
0.1mm was generating thousands of unnecessary points on straight
edges. Now: 1mm default, 0.5mm minimum, 500 max per edge.
Curves still get proper sampling, straight edges stay lean.
NXOpen Python wraps UF methods with version-specific names.
Now dumps available methods on UF.Modl, UF.Eval, UF.Curve
and tries them in order. Detailed logging shows which method
was found and used, plus raw result format on parse failures.
UF_EVAL.Evaluate() doesn't exist in NXOpen Python.
UF_MODL.AskCurveProps(tag, param) uses normalized 0-1
parameter and returns (point, tangent, normal, binormal,
torsion, radius). Works on all edge types.
- Uses ISOGRID_RIB_sandbox_N_thk expression for thickness
- Creates expression if missing, uses existing if present
- Symmetric extrude: ±thk/2 from sketch plane
- Fallback to literal value if expression fails
- Create section explicitly if builder.Section returns None
- Try 3 approaches for adding curves: CreateRuleCurveFeature,
CreateRuleCurveDumb with options, CreateRuleCurveDumb without
- Detailed step-by-step logging for debugging
- Get help point from first sketch curve for section seeding
Full cycle now automated:
1. Delete old extrude (if exists)
2. Delete old sketch (try ReplaceFeatureBuilder first, fallback to delete)
3. Create new sketch with rib geometry
4. Extrude new sketch by rib thickness along face normal
5. Name both features for identification on next iteration
Rib thickness read from profile JSON (parameters_used.thickness)
with fallback to geometry JSON or default 10mm.
No more manual extrude step needed between iterations.
Replaces naive ReplaceEntity approach with NX's proper
ReplaceFeatureBuilder API. This mirrors the interactive
right-click → Replace Feature workflow:
- SelectFeature: old sketch to replace
- ReplacementFeature: new sketch taking over
- DoAutomaticGeomMatch: auto-maps curves
- DeleteOriginalFeature: removes old after remap
- Fallback: manual delete if builder fails
All downstream features (extrude, trim) automatically
re-reference the new sketch.
Complete rewrite of triangulation engine:
- Regular hexagonal-packed vertex grid (equilateral triangles)
- Density-adaptive refinement: denser near holes, coarser in open areas
- Boundary-conforming vertices along frame edge and hole keepouts
- Delaunay on point set + clip to valid region (inside frame, outside keepouts)
- Result: proper isogrid layout, 87 pockets from 234 triangles
- 553 NX entities, min fillet 4.89mm, mass 2770g
- No more dependency on Shewchuk Triangle library (scipy.spatial.Delaunay)
- Switched to uniform triangulation (no density-adaptive refinement for
initial pass — saves that for stress-informed iterations)
- s_min=45mm, s_max=55mm (was 12/35) — larger triangles fit 6mm fillets
- Boss keepout circles: 12 segments (was 32) — less boundary clutter
- Fillet must be >= 80% of r_f at every corner or pocket is skipped
- Result: 75 pockets, 481 NX entities, min fillet 4.85mm, mass 4066g
- adaptive_density=True param enables density refinement for future stress iterations
- Default r_f raised from 1.5mm to 6mm (machining constraint)
- Default min_pocket_radius raised to 6mm
- Pockets that can't fit r_f at any corner (within 80% tolerance) are
skipped entirely — left solid for more stiffness in tight areas
- Result: 26 pockets (was 432), 187 NX entities (was 13,061)
- Min fillet radius: 4.88mm, all >= 4.8mm (80% of 6mm)
- Mass: 4,601g (was 3,480g — more solid = heavier but manufacturable)
Model curves (part.Curves.CreateLine) are SmartObjects that can't be added
to a sketch via AddGeometry. Switch to SketchLineBuilder which creates
native sketch geometry directly (SetStartPoint/SetEndPoint/Commit).
