How to save .step file with TopoDs_Shape and color them

x xo
Tue, 05/23/2023 - 11:32

Forums:

Hello，
I am trying to split part with a .STEP file,I can get the TopoDs_Shape but when i save it the file was no color. I dont know why,Is me lost the color when i load it？
This is my code:

string ShapeToStep1(TopoDS_Shape shape) {
string route = "E:/Share/1/test.step";
const Standard_CString aFileName = route.c_str();
STEPControl_StepModelType type = STEPControl_AsIs;
STEPControl_Writer aWriter;
aWriter.Transfer(shape, STEPControl_AsIs);
aWriter.Write(aFileName);

return aFileName;
}

Dmitrii Pasukhin
Tue, 05/23/2023 - 14:53

Hello,

STEPControl_Writer doesn't support any data instead of geometry. TopoDS_Shape contains only geometry. To work with color and other attributes you need to work with TDocStd_Document.

Please take a look into Extended Data Exchange (XDE) - Open CASCADE Technology Documentation

If you need an example how to attache a color into TopoDS_Shape, let me know. But in TopoDS_Shape you can't store any attributes.

Best regards, Dmitrii,

x xo
Wed, 05/24/2023 - 06:40

Thanks,
I can save .step file with right color when i use STEPCAFControl_Writer,But when the TDF_Lable has TopoDs_Shape more than one how can i save .step with the part of label with them original color?

Attachments:

image2023-5-24_11-32-11.png

Dmitrii Pasukhin
Wed, 05/24/2023 - 10:10

Please look into XCadDoc_Editor. I suggest, you need to create a new document and copy needed TDF_Label into new Doc (all reference attributes will be copy too)

If you will have some problem, with XcafDoc_Editor, let me know. This class has no very often usage.

Best regard, Dmitrii.

x xo
Wed, 05/24/2023 - 11:01

Thanks,I will try it
I found anther one question .when i save the part of assemb with STEPCAFControl_Writer. The parts of them get wrong location.

Attachments:

origin.png

split.png

Dmitrii Pasukhin
Wed, 05/24/2023 - 11:57

It is a normal case.You need to calculate global transform all all parents and update own transformation.

It is necessary to keep the same position on the scene.

Best regards, Dmitrii.

x xo
Wed, 05/24/2023 - 12:55

You means get some information for TDF_Label?and how to change the part location? I dont know how to do this，Can you give me some specific method，Thanks

Dmitrii Pasukhin
Wed, 05/24/2023 - 13:08

So, To change position of root you need to get Handle(XCafDoc_ShapeTool) from the document and then call aShTool->SetLocation(theRootL, theLocation, theNewRootL);

theNewRootL - label with moved location.

Best regards, Dmitrii.

x xo
Thu, 05/25/2023 - 13:13

Sorry,I can't find any function about SetLocation(theRootL, theLocation, theNewRootL) in OCCT.
thanks.

Dmitrii Pasukhin
Thu, 05/25/2023 - 13:31

It was implemented into OCCT 7.7.0

If you use older version, please copy-past a code to your solution from new version.

Best regards, Dmitrii.

x xo
Fri, 05/26/2023 - 11:09

sorry,I'm still can't find this function.Is it contained by TDocStd_Document.hxx or XCAFDoc_ShapeTool.hxx?I only can find TopLoc_Location GetLocation (const TDF_Label &L).

Dmitrii Pasukhin
Fri, 05/26/2023 - 11:18

XCAFDoc_ShapeTool.hxx

OCCT Git - occt.git/blob - src/XCAFDoc/XCAFDoc_ShapeTool.hxx (opencascade.org)

Best regards, Dmitrii.

x xo
Mon, 05/29/2023 - 06:13

I think when i get the part label i'm already get wrong location or lost shape location.The location for .STEP what i saved was moved to origin.How do i get the original location.
Here is my code:

bool test(Standard_CString fileloc) {
Handle(TDocStd_Document) aDocument = ReadSTEPToDocument(fileloc);
Handle(XCAFDoc_ShapeTool) aShapeTool = XCAFDoc_DocumentTool::ShapeTool(aDocument->Main());
TDF_LabelSequence aRootLabels;
aShapeTool->GetFreeShapes(aRootLabels);
TDF_Label labelMain;
std::vector vecShapelabels;
for (TDF_LabelSequence::Iterator aRootIter(aRootLabels); aRootIter.More(); aRootIter.Next())
{
const TDF_Label& aRootLabel = aRootIter.Value();

if (XCAFDoc_ShapeTool::IsAssembly(aRootLabel))
{
if (labelMain.IsNull())
{
labelMain = aRootLabel;
}
}
GetAssemblyShapes(aRootLabel, vecShapelabels);
char* namee;
std::vector vecShapelabels11;
for (auto it_ls = vecShapelabels.begin(); it_ls != vecShapelabels.end(); ++it_ls)
{

std::string sss = "test.STEP";

auto L2 = aShapeTool->GetLocation(*it_ls);
TDF_Label anewlabel;
bool setloc = aShapeTool->SetLocation(*it_ls, L2, anewlabel);
WriteStepByXDE(sss.c_str(), anewlabel);

}
}
return true;
}

Thanks.

Attachments:

wronglocationstep.zip

x xo
Mon, 05/29/2023 - 11:20

I found I can't get any location from TDF_Label by GetLocation (const TDF_Label& L).This function always return false When i use SetLocation (const TDF_Label& theShapeLabel, const TopLoc_Location& theLoc, TDF_Label& theRefLabel) By a TopLoc_Location like jpg2.

Attachments:

nothing.png

jpg2.png