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OpenCascade returns repeated names from STEP

Leonardo Ghizoni's picture
Forums: 

Hello,

I'm writing a code to read the names of all the solids in a STEP model and export them to stl separate files. So far I succeeded, but there's a strange behavior on the outputs: some of the solids return the same name. I've of course checked the STEP file, and the names do not repeat.

Here's my complete code:

#include <iostream>
#include <vector>
#include <string>
#include <sys/types.h>
#include <dirent.h>
#include <map>

#include <STEPCAFControl_Reader.hxx>
#include <StepRepr_Representation.hxx>
#include <XCAFApp_Application.hxx>
#include <XCAFDoc_DocumentTool.hxx>
#include <XCAFDoc_ShapeTool.hxx>
#include <XCAFDoc_ColorTool.hxx>
#include <Quantity_Color.hxx>
#include <Resource_Unicode.hxx>
#include <TDF_ChildIterator.hxx>
#include <TDocStd_Document.hxx>
#include <TDF_LabelSequence.hxx>
#include <TDataStd_Name.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepBuilderAPI_Transform.hxx>
#include <Interface_Static.hxx>
#include <StlAPI_Writer.hxx>

using namespace std;

int main()
{
    int mkdir;
    string Dir = ".../Directory/";
    string FileName = "Module.step";
    string inFile   = Dir+FileName;//+stepFile;
    string command = "mkdir "+Dir+"STL";
    const char *Command = command.c_str();
    mkdir = system(Command);

    // Create Document
    Handle(TDocStd_Document) aDoc;
    Handle(XCAFApp_Application) anApp = XCAFApp_Application::GetApplication();
    anApp->NewDocument(FileName.c_str(),aDoc);

    // Create additional log file
    STEPCAFControl_Reader aReader;
    aReader.ReadFile(inFile.c_str());
    aReader.Transfer(aDoc);

    if(!aReader.Transfer(aDoc)){
        cout<<"ERROR: Could NOT read the STEP file."<<endl;
    }

    aReader.SetNameMode(true);
    aReader.SetColorMode(true);
    aReader.SetMatMode(true);

    Handle(XCAFDoc_ShapeTool) l_ShapeTool = XCAFDoc_DocumentTool::ShapeTool(aDoc->Main());
    Handle(XCAFDoc_ColorTool) l_ColorTool = XCAFDoc_DocumentTool::ColorTool(aDoc->Main());

    // Shape Extraction & Conversion

    TDF_LabelSequence FreeShapes;
    l_ShapeTool->GetShapes(FreeShapes);
    TDF_LabelSequence shapes;
    l_ShapeTool->GetComponents(FreeShapes.Value(1),shapes,true);

    TCollection_ExtendedString extstr_shapes[shapes.Length()];
    string shapes_names[shapes.Length()];

    vector<float> RedVector;
    vector<float> GreenVector;
    vector<float> BlueVector;

    for(Standard_Integer i=1; i<=shapes.Length();i++){

        TDF_Label label = shapes.Value(i);

        TopoDS_Shape shape;
        l_ShapeTool->GetShape(label,shape);

        // Color Try-Out Declaration
        //TDF_Label l_ColorLabel;
        //Quantity_Color aColor;

        TopAbs_ShapeEnum type = shape.ShapeType();
        if(type == TopAbs_SOLID){

            //BRepBuilderAPI_Transform xform(shape,transformation,Standard_True);
            //shape = xform.Shape();
            Handle(TDataStd_Name) name;
            if(label.FindAttribute(TDataStd_Name::GetID(),name)){
                //TCollection_ExtendedString extstr_shapes = name->Get();
                extstr_shapes[i] = name->Get();
                shapes_names[i] = TCollection_AsciiString(extstr_shapes[i]).ToCString();
                //string shapes_names = TCollection_AsciiString(extstr_shapes).ToCString();
                //cout<<extstr_shapes[i]<<endl;
                //cout<<shapes_names[i]<<endl;
            }

            // Shape Meshing and conversion to STL

            BRepMesh_IncrementalMesh BMesh(shape,0.1,Standard_True);
            StlAPI_Writer STLwriter;
            string Filename;
            //Filename = Dir+"STL/("+to_string(i)+") "+shapes_names[i]+".stl";
            Filename = Dir+"STL/"+shapes_names[i]+".stl";
            STLwriter.Write(shape,Filename.c_str());
        }
    }

    cout<<"Shape         Color"<<endl;
    for(Standard_Integer i=0; i < shapes.Length(); i++){
        cout<<shapes_names[i]<<endl;
    }

    return 0;
}

Here's my output:

M2x10_TX6_6

M2x10_TX6_13

castor-v020

M2x10_TX6_14

M2x10_TX6_7

castor-v020

castor-v020

M2x10_TX6_11

M2x10_TX6_2

M2x10_TX6_12

M2x10_TX6

castor-v020

castor-v020

castor-v020

castor-v020

castor-v020

M2x10_TX6_4

M2x10_TX6_8

castor-v020

castor-v020

Sshield_top

castor-v020

M2x10_TX6_10

castor-v020

castor-v020

M2x10_TX6_9

Sshield_bottom

M2x10_TX6_1

M2x10_TX6_5

castor-v020

castor-v020

M2x10_TX6_3

The "castor-v**" is actually changing in the STEP file, as you can see in the figure attached.

I would really appreciate help. I simply cannot find an error that results in repeated names :(

Thanks in advance.

Attachments: 
Kirill Gavrilov's picture

Could you attach a STEP file?

Leonardo Ghizoni's picture

The step file exceeds the limit of 10MB, so here it is a shareable link: https://drive.google.com/open?id=13M0hRh4J82zrJeWiquOdv-uRLZ-ZjAr3

It's the same file of the results I posted before. Please let me know if you can access it, and thanks again!

Cheers,

/Leonardo.

Leonardo Ghizoni's picture

I have already tried replying, but trying again.

Here's the link for the STEP file: https://drive.google.com/open?id=13M0hRh4J82zrJeWiquOdv-uRLZ-ZjAr3

Thanks a lot for the help.

/Leonardo,

Kirill Gavrilov's picture

The "castor-v**" is actually changing in the STEP file, as you can see in the figure attached. 

No, they don't - I see no "castor-v023" entities in CAD Assistant nor any such string in STEP file itself.
Look like a different STEP model or issues with STEP export.

Kenji Hara's picture

Leonardo said "I've of course checked the STEP file,", but I think he did it on FreeCAD.

The original STEP file provided by Leonardo actually contains duplicated names ​'​castor-v020'.

But, when I open the file in FreeCAD, the duplicated solid names will be renumbered automatically because FreeCAD disallow to set same name for two or more shapes. I guess that would be the root cause.

Attachments: 
Leonardo Ghizoni's picture

Dear Kiril and Kenji,

Thank you so much for both your answers. That was my own mistake! Kiril is correct that the names do not change, and FreeCAD renames the solids so as not to have repeated names, as Kenji mentioned.

Apologies, and thank you again for your help.

Best Regards,

/Leonardo

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