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>
81 lines
2.3 KiB
Python
81 lines
2.3 KiB
Python
"""
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NX Journal Script to Export Expressions to .exp File
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This script exports all expressions from the work part to a .exp file.
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The .exp format is NX's native expression export format and captures ALL expressions
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including formulas, references, and unitless expressions.
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Usage: run_journal.exe export_expressions.py <prt_file_path> <output_exp_path>
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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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"""
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Export expressions from a .prt file to .exp format.
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Args:
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args: Command line arguments
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args[0]: .prt file path
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args[1]: output .exp file path (without .exp extension)
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"""
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if len(args) < 2:
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print("ERROR: Not enough arguments")
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print("Usage: export_expressions.py <prt_file> <output_path>")
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return False
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prt_file_path = args[0]
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output_path = args[1] # NX adds .exp automatically
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print(f"[JOURNAL] Exporting expressions from: {prt_file_path}")
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print(f"[JOURNAL] Output path: {output_path}.exp")
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try:
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theSession = NXOpen.Session.GetSession()
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# Close any currently open parts
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print("[JOURNAL] Closing any open parts...")
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try:
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partCloseResponses = [NXOpen.BasePart.CloseWholeTree]
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theSession.Parts.CloseAll(partCloseResponses)
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except:
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pass
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# Open the .prt file
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print(f"[JOURNAL] Opening part file...")
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basePart, partLoadStatus = theSession.Parts.OpenActiveDisplay(
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prt_file_path,
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NXOpen.DisplayPartOption.AllowAdditional
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)
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partLoadStatus.Dispose()
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workPart = theSession.Parts.Work
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if workPart is None:
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print("[JOURNAL] ERROR: No work part loaded")
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return False
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# Export expressions to .exp file
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print("[JOURNAL] Exporting expressions...")
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workPart.Expressions.ExportToFile(
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NXOpen.ExpressionCollection.ExportMode.WorkPart,
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output_path,
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NXOpen.ExpressionCollection.SortType.AlphaNum
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)
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print(f"[JOURNAL] Successfully exported expressions to: {output_path}.exp")
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return True
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except Exception as e:
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print(f"[JOURNAL] ERROR: {e}")
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import traceback
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traceback.print_exc()
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return False
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if __name__ == '__main__':
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success = main(sys.argv[1:])
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sys.exit(0 if success else 1)
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