Anto01
8b14f6e800
Major Enhancement: - Implemented .exp file-based expression updates via NX journal scripts - Fixes critical issue with feature-linked expressions (e.g., hole_count) - Supports ALL NX expression types including binary-stored ones - Full 4D design space validation completed successfully New Components: 1. import_expressions.py - NX journal for .exp file import - Uses NXOpen.ExpressionCollection.ImportFromFile() - Replace mode overwrites existing values - Automatic model update and save - Comprehensive error handling 2. export_expressions.py - NX journal for .exp file export - Exports all expressions to text format - Used for unit detection and verification 3. Enhanced nx_updater.py - New update_expressions_via_import() method - Automatic unit detection from .exp export - Creates study-variable-only .exp files - Replaces fragile binary .prt editing Technical Details: - .exp Format: [Units]name=value (e.g., [MilliMeter]beam_length=5000) - Unitless expressions: name=value (e.g., hole_count=10) - Robustness: Native NX functionality, no regex failures - Performance: < 1 second per update operation Validation: - Simple Beam Optimization study (4D design space) * beam_half_core_thickness: 10-40 mm * beam_face_thickness: 10-40 mm * holes_diameter: 150-450 mm * hole_count: 5-15 (integer) Results: ✅ 3-trial validation completed successfully ✅ All 4 variables update correctly in all trials ✅ Mesh adaptation verified (hole_count: 6, 15, 11 → different mesh sizes) ✅ Trial 0: 5373 CQUAD4 elements (6 holes) ✅ Trial 1: 5158 CQUAD4 + 1 CTRIA3 (15 holes) ✅ Trial 2: 5318 CQUAD4 (11 holes) Problem Solved: - hole_count expression was not updating with binary .prt editing - Expression stored in feature parameter, not accessible via text regex - Binary format prevented reliable text-based updates Solution: - Use NX native expression import/export - Works for ALL expressions (text and binary-stored) - Automatic unit handling - Model update integrated in journal Documentation: - New: docs/NX_EXPRESSION_IMPORT_SYSTEM.md (comprehensive guide) - Updated: CHANGELOG.md with Phase 3.2 progress - Study: studies/simple_beam_optimization/ (complete example) Files Added: - optimization_engine/import_expressions.py - optimization_engine/export_expressions.py - docs/NX_EXPRESSION_IMPORT_SYSTEM.md - studies/simple_beam_optimization/ (full study) Files Modified: - optimization_engine/nx_updater.py - CHANGELOG.md Compatibility: - NX 2412 tested and verified - Python 3.10+ - Works with all NX expression types 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
78 lines
2.2 KiB
Python
78 lines
2.2 KiB
Python
"""
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NX Journal: Import expressions from .exp file
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Usage: run_journal.exe import_expressions.py -args <prt_file> <exp_file>
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"""
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import sys
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import NXOpen
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def main(args):
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if len(args) < 2:
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print("[ERROR] Usage: import_expressions.py <prt_file> <exp_file>")
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sys.exit(1)
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prt_file = args[0]
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exp_file = args[1]
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theSession = NXOpen.Session.GetSession()
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# Open the part file
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partLoadStatus1 = None
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try:
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workPart, partLoadStatus1 = theSession.Parts.OpenActiveDisplay(
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prt_file,
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NXOpen.DisplayPartOption.AllowAdditional
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)
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finally:
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if partLoadStatus1:
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partLoadStatus1.Dispose()
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print(f"[JOURNAL] Opened part: {prt_file}")
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# Import expressions from .exp file
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markId1 = theSession.SetUndoMark(NXOpen.Session.MarkVisibility.Visible, "Import Expressions")
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try:
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expModified, errorMessages = workPart.Expressions.ImportFromFile(
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exp_file,
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NXOpen.ExpressionCollection.ImportMode.Replace
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)
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print(f"[JOURNAL] Imported expressions from: {exp_file}")
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# expModified can be either a bool or an array depending on NX version
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if isinstance(expModified, bool):
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print(f"[JOURNAL] Import completed: {expModified}")
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else:
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print(f"[JOURNAL] Expressions modified: {len(expModified)}")
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if errorMessages:
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print(f"[JOURNAL] Import errors: {errorMessages}")
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# Update the part to apply expression changes
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markId2 = theSession.SetUndoMark(NXOpen.Session.MarkVisibility.Invisible, "NX update")
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nErrs = theSession.UpdateManager.DoUpdate(markId2)
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theSession.DeleteUndoMark(markId2, "NX update")
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print(f"[JOURNAL] Part updated (errors: {nErrs})")
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# Save the part
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partSaveStatus = workPart.Save(
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NXOpen.BasePart.SaveComponents.TrueValue,
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NXOpen.BasePart.CloseAfterSave.FalseValue
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)
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partSaveStatus.Dispose()
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print(f"[JOURNAL] Part saved: {prt_file}")
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except Exception as e:
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print(f"[ERROR] Failed to import expressions: {e}")
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sys.exit(1)
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print("[JOURNAL] Expression import complete!")
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if __name__ == '__main__':
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main(sys.argv[1:])
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