Preliminary discussion on NetGen and Gmsh mesh generation of any multiple sub models of CAD based on osg+occ

This function is an extension of the previous grid interaction , There is no real-time innovation , This modification is based on the selection of any model tree node , By finding all of the nodes shape after , For these shape Meshing . The modification realizes the hiding of any node 、 Show 、 The highlighted 、 Hidden function and meshing function of any node . Take grid division as an example ：

The core idea is to find all shape Merge into a new shape, The core code is as follows ：

TopoDS_Shape  QFormDoc::makeOneShape(Handle(TopTools_HSequenceOfShape) theShapes)
{
    TopoDS_Shape res;
    Standard_Integer nb = theShapes->Length();
    if (nb == 0)
        return res;
    else if (nb == 1) 
        return theShapes->Value(1);
    else 
    {
        TopoDS_Compound C;
        BRep_Builder B;
        B.MakeCompound(C);
        for (Standard_Integer i = 1; i <= nb; i++)
        {
            B.Add(C, theShapes->Value(i));
        }
        return C;
    }
}

Other interfaces do not need to be changed , Just put the new shape Pass to netgen perhaps gmsh That's it , It is the same to show these , Come directly and see the effect first ：