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IDProjectCategoryView StatusLast Update
0033368CommunityOCCT:Data Exchangepublic2023-04-20 20:43
Reporterdpasukhi Assigned Toika  
Status newResolutionopen 
Product Version7.7.0 
Target VersionUnscheduled 
Summary0033368: Data Exchange, Step Import - Split periodical surfaces

Attached you can find two STEP files exported from the same SolidWorks model.
example_split-periodical-surfaces.STEP is exported with the option “Split periodical surfaces” set.
example_nosplit-periodical-surfaces.STEP is exported with the option “Split periodical surfaces” unset.

The option makes a difference for e.g. cylindrical holes but also for conical surfaces.
Specifically, it automatically exports two half cylindrical surfaces for each full cylindrical surface.
For conical surface we can also see, that they are split in halves.

It seems that GMSH (which is reading STEP files with OpenCascade) cannot mesh the STEP file with no surface split and it generate the error “Impossible to mesh periodic surface” for the conical surfaces.

I'm trying to identify the issue here.
Could it be, that OpenCascade misinterprets the BREP definition for the conical surfaces in the case of example_nosplit-periodical-surfaces.STEP?
Could someone thake a look at this file?

Many thanks
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Test case number

Attached Files

  • Desktop.7z (37,183 bytes)



2023-04-20 18:56

developer   ~0113402

There files to reproduce:
For more details, please check forum:
Desktop.7z (37,183 bytes)

Issue History

Date Modified Username Field Change
2023-04-20 18:55 dpasukhi New Issue
2023-04-20 18:55 dpasukhi Assigned To => ika
2023-04-20 18:56 dpasukhi Note Added: 0113402
2023-04-20 18:56 dpasukhi File Added: Desktop.7z