Selecting a face of 3D Solid and getting it Material

Vinit Shukla

 Hello,

         For my application I need to select the face (sub entity) of a 3D Solid and extract material information from it. I have below code,which works fine in Teigha Viewer, i.e. I am able to select a Face and extract material information. But this code does not select sub entity (face) in BricsCAD.

[code]void DsFormBrepUtils::GetPoints(OdEdCommandContext* pCmdCtx)

{

    OdDbCommandContextPtr pDbCmdCtx(pCmdCtx);

    OdDbDatabasePtr pDb = pDbCmdCtx->database();

    OdDbSelectionSetIteratorPtr pIter = pDbCmdCtx->dbUserIO()->select(L"Select a face", OdEd::kSelAllowSubents)->newIterator();

    while ( !pIter->done() )

    {

        OdDbObjectId objId = pIter->objectId();

        if (objId.isNull())

            continue;

        OdDbObjectIdArray loopIds;

        loopIds.append(objId);

        if (OdUInt32 subents = pIter->subentCount())

        {

            OdDbEntityPtr pMainEnt = objId.safeOpenObject(OdDb::kForWrite);

            OdDb3dSolidPtr pBody = OdDb3dSolid::cast(pMainEnt);

            if (pBody == nullptr)

                continue;

            for (OdUInt32 i = 0; i < subents; ++i)

            {

                OdDbFullSubentPath subEntPath;

                if (pIter->getSubentity(i, subEntPath))

                {

                    OdDbEntityPtr subent = pMainEnt->subentPtr(subEntPath);

                    if (subent.isNull())

                        continue;

                    OdDbObjectId matIdGet;

                    OdResult res = pBody->getSubentMaterial(subEntPath.subentId(), matIdGet);

                    if (res == eOk)

                    {

                        OdDbMaterialPtr pMaterial = OdDbMaterial::cast(matIdGet.openObject());

                        if (!pMaterial.isNull())

                        {

                            OdString materialName = pMaterial->name();

                            if (pCmdCtx != nullptr)

                            {

                                OdDbCommandContextPtr pDbCmdCtx(pCmdCtx);

                                pDbCmdCtx->userIO()->putString(materialName);

                            }

                        }

                    }

                }

            }

        }

        pIter->next();

    }

}[/code]

Sakko

Hi Vinit,
you obviously programm in C++ ....
Have a look at these two examples written in C# .NET ...you could then write similar code in C++ .

1. Select the Face of a Solid 3D
     http://adndevblog.typepad.com/autocad/2012/03/selecting-solid3d-sub-entities.html

2. Getting the Face Material...after getting the subentity ID of the Face...
    http://adndevblog.typepad.com/autocad/2012/03/getting-material-name-associated-with-a-face.html

********  Code Snippet *********************

    using (Brep brep = new Brep(path))

    {

        foreach    ( Autodesk.AutoCAD.BoundaryRepresentation.Face    face   in    brep.Faces )

        try

        {

            ObjectId materialId = solid3d.GetSubentityMaterial( face.SubentityPath.SubentId);

                Material material = tr.GetObject(materialId, OpenMode.ForRead) as Material;

                           ......................



    

Vinit Shukla

 Thanks for the reply. 

I was able to implement the suggested code. I was able to get the AcDbFullSubentPath of the selected face. But following code is not linking because of highlighted line

[code]

     ... // Code to select the face and get AcDbFullSubentPath

     AcBrFace *pEnt = new AcBrFace();

     AcBr::ErrorStatus returnValue = AcBr::eOk;

     returnValue = pEnt->setSubentPath(subPath);

     if (returnValue != AcBr::eOk) {

         acutPrintf(ACRX_T("\n Error in AcBrEntity::set:"));

         return;

     }

/code]

Is AcBrEntity::setSubentPath() not implemented yet. Do you have some C++ samples of AcBr ?

Also as per your suggestion I have to use AcDb3dSolid::getSubentMaterial(), which is not implemented in BricsCAD SDK 15.

I am still using BRXSDK_V15_1_04. Are these implemented in BricsCAD SDK 16.1

Luc De Batselier

AcBrEntity::setSubentPath() is implemented, minimum required versions are BRX SDK r9326 and BricsCAD V15.3.04