step - 为什么我的 STEP 文件会导致分段错误？

Question

我正在编写空气动力学设计软件，并希望将用户指定的几何图形导出为 STEP 文件。我已经设法生成了一个 STEP 文件，在我看来它是完整的，但是当我尝试用 FreeCAD 打开它时，我遇到了分段错误。我的文件有什么问题？

我尝试将 edge_curve 的实体类型更改为 line 之外的其他内容，但我不断收到相同的错误。我也尝试过使用 Solidworks 打开文件，但它也无法打开文件。

这是来自 FreeCAD 的错误消息：

Program received signal SIGSEGV, Segmentation fault.
#0  /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7f609a911f20]
#1  0x7f6009b06bd4 in StepShape_EdgeCurve::EdgeGeometry() const from /usr/lib/x86_64-linux-gnu/libTKSTEPBase.so.7+0x4
#2  0x7f600d92ae4e in StepToTopoDS_TranslateEdgeLoop::Init(opencascade::handle<StepShape_FaceBound> const&, TopoDS_Face const&, opencascade::handle<Geom_Surface> const&, opencascade::handle<StepGeom_Surface> const&, bool, StepToTopoDS_Tool&, StepToTopoDS_NMTool&) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x10de

还有更多，但这些行似乎是最相关的。谁能指出我哪里出错了？

编辑

我已经进行了建议的更改，现在 FreeCAD 将打开，但设计空间中没有显示任何内容。也不会抛出任何错误。我不确定现在发生了什么。

ISO-10303-21;
HEADER;
FILE_DESCRIPTION ( ( 'STEP AP203' ) , '1' ) ;
FILE_NAME ( 'test_plane.stp' , '', ('Author'), (''), 'MachUpX', 'MachUpX', 'Unknown' ) ;
FILE_SCHEMA ( '' );
ENDSEC;

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score 1 · Accepted Answer

FreeCAD 依靠 Open CASCADE Technology (OCCT) 库来读取 STEP 文件。如果您将在 CAD 助手（基于 OCCT 的免费 3D 查看器）中打开您的 STEP 文件，您将在 OCCT 阅读器生成的消息窗口中看到以下输出：

20:29 Errors on Reading Header Entity N0.6:HeaderSection_FileSchema
20:29 Parameter #1 (schema_identifiers) is not a LIST
      Error occurred transferring STEP file!
      C:/test.stp
20:29 Count STEP Reader Failures for 'test.stp'
       -----    -----------
           1    F: Parameter #1 (schema_identifiers) is not a LIST
           1    F:SHAPE_DEFINITION_REPRESENTATION: Count of Parameters is not 2 for shape_definition_representation
           1    F:CLOSED_SHELL: Parameter n0.3 (face) : Entity has illegal type
          20    F:ORIENTED_EDGE: Parameter n0.4 (edge_element) not an Entity
          40    F:VERTEX: Count of Parameters is not 1 for vertex
           1    F:B_SPLINE_SURFACE_WITH_KNOTS: Parameter n0.9 (u_multiplicities) not a LIST
           1    F:B_SPLINE_SURFACE_WITH_KNOTS: Parameter n0.10 (v_multiplicities) not a LIST
           1    F:GEOMETRIC_REPRESENTATION_CONTEXT: Count of Parameters is not 3 for geometric_representation_context
          Nb Total:66  for 8 items

这些消息可以帮助找出 STEP 文件中有什么问题，或者至少 OCCT 阅读器不喜欢文件中的什么。

但是，有一个问题，为什么要从头开始编写 STEP 编写器而不是使用一些现有的库？我想要导出的几何结构相当简单，让自己的 STEP 编写器值得努力。

step - 为什么我的 STEP 文件会导致分段错误？

1 回答 1

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