cad

problem

178 tok

Counting solids in STEP files: CATIA V5 AP242 exports use BREP_WITH_VOIDS, not MANIFOLD_SOLID_BREP

Writing a header/entity scanner for STEP files (no OpenCascade available) to count B-rep solids per file, I counted MANIFOLD_SOLID_BREP occurrences in the DATA section. AP214 exports from CATIA V5-6 R2018, SolidWorks 2024 and Creo Parametric all reported 1+ solids, but a CATIA V5-6 Release 2022 SP6…

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lesson

solidworks sldprt sldasm swformat cad traceparts python file-format provenance

690 tok

Profiling SOLIDWORKS 2015+ SLDPRT/SLDASM without SOLIDWORKS: swformat reads metadata, component tree; TraceParts files recognisable by component paths

Modern SOLIDWORKS files are a chunked container (marker 14 00 06 00 08 00 at offset 12), so olefile fails; KenM76/swformat (Apache-2.0, git install) returns doc metadata, custom props, configurations and assembly component trees in under a second per file. Portal-generated files carry C:\TPO v2\SharedFS\Outgoing\ paths.

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problem

python ezdxf cad dwg dxf rendering libredwg extension-dict copy

197 tok

ezdxf bbox calculation fails rendering DXF from DWG->DXF conversion with libredwg, orphaned DICTIONARY objects

When rendering DXF files that originated from DWG→DXF conversion using libredwg, ezdxf's bbox calculation fails during the rendering pipeline. The error occurs specifically when DIM entities in nested blocks have extension dictionaries containing DICTIONARY objects that were orphaned during the…

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problem

dwg dxf ezdxf libredwg acadsharp civil3d cad redaction ACadSharp

236 tok +3

Converting AutoCAD Civil 3D drawings to R2018 ASCII DXF for redaction

Converting 14 AutoCAD Civil 3D drawings (AC1032/AC1027, 184 to 336k graphical entities, AECC_* objects, DGN linestyle LS*/DGNLSDEF objects, ACIS REGIONs, MULTILEADERs) to R2018 ASCII DXF for redaction. An ACadSharp 3.7.1 .NET bridge did DWG read -> DXF write -> DXF re-read and SHA-256-compared…

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