使用OpenCASCADE为STP模型赋予颜色：告别默认灰显

    STEPCAFControl_Reader reader;
    reader.SetColorMode(true);
    reader.SetNameMode(true);
    IFSelect_ReturnStatus status= reader.ReadFile(aFilePath.ToCString());
    Handle(XCAFApp_Application) anApp=XCAFApp_Application::GetApplication();
    Handle(TDocStd_Document) doc;
    anApp->NewDocument("MDTV-XCAF",doc);
    bool yes = reader.Transfer(doc);
    TDF_Label mainLabel=doc->Main();
    Handle(TDataStd_Name) rootName;
    Handle(TDF_Attribute) rootAtt;
    Handle(XCAFDoc_ShapeTool) rootNode=XCAFDoc_DocumentTool::ShapeTool(mainLabel);
    Handle(XCAFDoc_ColorTool) rootColorTool=XCAFDoc_DocumentTool::ColorTool(mainLabel);

    TDF_LabelSequence tdfLabels;
    rootNode->GetShapes(tdfLabels);   //获取装配体和组件对应名称
    int Roots=tdfLabels.Length();
    for(int i=1;i<=Roots;i++)
    {
        TDF_Label label=tdfLabels.Value(i);
//        Quantity_Color coll(Quantity_NOC_RED );
//        rootColorTool->SetColor ( label, coll, XCAFDoc_ColorGen );
        bool colorcolor = rootColorTool->IsSet(label,XCAFDoc_ColorGen);
         bool colorcolor1 = rootColorTool->IsSet(label,XCAFDoc_ColorSurf);
          bool colorcolor2 = rootColorTool->IsSet(label,XCAFDoc_ColorCurv);
        Quantity_Color col;
        rootColorTool->GetColor(label, XCAFDoc_ColorSurf,col);
        TopoDS_Shape rootShape=XCAFDoc_ShapeTool::GetShape(label);
        string str;
        if(label.FindAttribute(TDataStd_Name::GetID(),rootName))