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IDProjectCategoryView StatusDate SubmittedLast Update
0032769CommunityOCCT:Data Exchangepublic2022-01-11 20:102022-06-30 10:34
Reporterrobertlipman Assigned Togka  
PrioritynormalSeveritymajor 
Status newResolutionopen 
Product Version7.6.0 
Target Version7.7.0 
Summary0032769: Data Exchange - Slow processing of very large STEP file
DescriptionI am testing our NIST STEP to X3D translator that is based on OCCT 7.6.0 with very large STEP files. The largest STEP file that I have is about 1.5 GB. It takes about 30-40 minutes to process in CAD Assistant and our software. However, in two other free viewers (C3D Viewer, eDrawings Viewer) it only takes about 5 minutes. Is there something to be improved to reduce the processing time? I think the slow part is actually reading the STEP file.

20:24 ...    Step File Reading : 'C:/LEGO Star Wars - UCS Millennium Falcon (75192).stp'      ...    STEP File   Read    ...
            ... Step File loaded  ...
         34810634 records (entities,sub-lists,scopes), 108692999 parameters      ... Parameters prepared ...
            ...   Objects analysed  ...
        STEP Loading done : 19047906 Entities
20:58 Count   STEP Reader Failures for 'LEGO Star Wars - UCS Millennium Falcon (75192).stp'
       -----   -----------
          23   F:CONTEXT_DEPENDENT_OVER_RIDING_STYLED_ITEM: Parameter n0.1 (style_context) : Entity has illegal type
           2   F:CONTEXT_DEPENDENT_OVER_RIDING_STYLED_ITEM: Parameter n0.2 (style_context) : Entity has illegal type
        7112   F:ITEM_DEFINED_TRANSFORMATION: Parameter n0.1 (name) not a quoted String
        7112   F:(REPRESENTATION_RELATIONSHIP,REPRESENTATION_RELATIONSHIP_WITH_TRANSFORMATION,SHAPE_REPRESENTATION_RELATIONSHIP): Parameter n0.1 (name) not a quoted String
        7112   F:PRODUCT_DEFINITION_SHAPE: Parameter n0.1 (property_definition.name) not a quoted String
          Nb Total:21361  for 5 items
20:58 Count   STEP Translator Warnings for 'LEGO Star Wars - UCS Millennium Falcon (75192).stp'
       -----   -----------
       12893   W:EDGE_LOOP: Edges were intersecting, corrected
          26   W:EDGE_LOOP: Wire was split on several wires
          25   W:(BOUNDED_SURFACE,B_SPLINE_SURFACE,B_SPLINE_SURFACE_WITH_KNOTS,GEOMETRIC_REPRESENTATION_ITEM,RATIONAL_B_SPLINE_SURFACE,REPRESENTATION_ITEM,SURFACE): Surface forced to be periodic
         323   W:B_SPLINE_SURFACE_WITH_KNOTS: Surface forced to be periodic
          Nb Total:13267  for 4 items
20:58 File C:/LEGO Star Wars - UCS Millennium Falcon (75192).stp
      [loaded in 383.172 s]
      [prepared in 1929.96 s]
21:00 [brepmesh Deflection:  3.2828 mm (rel.: 0.001) Angle: 20° Parallel: 1 MinSize: 0.1 mm InternalVerticesMode: 1 ControlSurfaceDeflection: 1]
21:04 [presentation computed in 309.362 s]
21:05 Frame is redrawn in 3253.62 ms
      [5213 groups] [7491 parts] [2913131 faces]
      [65601082 triangles] [average per part: 3780] [average per group: 6236]
        Private memory:     9623 MiB
        Working Set:        6945 MiB (peak: 11708 MiB)
        Pagefile usage:     9623 MiB (peak: 12543 MiB)
        Virtual memory:     16494 MiB
        Heap memory:     5255 MiB
Steps To ReproduceThe very large STEP file is available here https://grabcad.com/library/lego-star-wars-ucs-millennium-falcon-75192-1 The author has many other Lego models, some that are also very large but not as large as this one.

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robertlipman

2022-01-12 23:24

reporter   ~0106323

For the "STEP Reader Failures", they are all related to strings that are either two single quotes '' or a dollar sign $. In both cases they are meant to indicate that the attribute is a blank string. I would not consider them failures nor anything to be reported.

On my computer, both eDrawings Viewer and C3D Viewer displayed the STEP file in about 4 minutes. CAD Assistant took 39 minutes.

Any improvement in processing would be great.

Issue History

Date Modified Username Field Change
2022-01-11 20:10 robertlipman New Issue
2022-01-11 20:10 robertlipman Assigned To => gka
2022-01-11 21:33 kgv Description Updated
2022-01-11 21:33 kgv Steps to Reproduce Updated
2022-01-11 21:34 kgv Target Version => 7.7.0
2022-01-11 21:34 kgv Summary Slow processing of very large STEP file => Data Exchange - Slow processing of very large STEP file
2022-01-12 23:24 robertlipman Note Added: 0106323