How to turn mesh shape to topoShape?

[JOE_FU]

Hi,everyone.
I always get a mesh obj, when I insert a model in obj format.But I want to turn this object to a topoShape, which can be used in Part workbench.How can I do it?

[chrisb]

Moved to help forum.

There are lots of forum topics explaining how to convert a stl to a solid. Basically, you import the file as a mesh, convert in Part workbench the mesh to a shape and the shape to a solid.

[vocx]

...But I want to turn this object to a topoShape, which can be used in Part workbench.How can I do it?

Use Part_ShapeFromMesh.

[JOE_FU]

Hi,everyone.
I always get a mesh obj, when I insert a model in obj format.But I want to turn this object to a topoShape, which can be used in Part workbench.How can I do it?

In the process of converting mesh to Part, I encountered new troubles. Some obj model files are very slow in the process of converting to Part. I traced the code and found that the code that affects speed is in the function of setFace. One of them is aSewingTool.Perform ().
As far as I know, the function of this function is to stitch triangle patches.

Code: Select all

void TopoShape::setFaces(const std::vector<Base::Vector3d> &Points,
                         const std::vector<Facet> &Topo, float Accuracy)
{
    gp_XYZ p1, p2, p3;
    TopoDS_Vertex Vertex1, Vertex2, Vertex3;
    TopoDS_Face newFace;
    TopoDS_Wire newWire;
    BRepBuilderAPI_Sewing aSewingTool;
    Standard_Real x1, y1, z1;
    Standard_Real x2, y2, z2;
    Standard_Real x3, y3, z3;

    aSewingTool.Init(Accuracy,Standard_True);

    TopoDS_Compound aComp;
    BRep_Builder BuildTool;
    BuildTool.MakeCompound(aComp);

    unsigned int ctPoints = Points.size();
    for (std::vector<Facet>::const_iterator it = Topo.begin(); it != Topo.end(); ++it) {
        if (it->I1 >= ctPoints || it->I2 >= ctPoints || it->I3 >= ctPoints)
            continue;
        x1 = Points[it->I1].x; y1 = Points[it->I1].y; z1 = Points[it->I1].z;
        x2 = Points[it->I2].x; y2 = Points[it->I2].y; z2 = Points[it->I2].z;
        x3 = Points[it->I3].x; y3 = Points[it->I3].y; z3 = Points[it->I3].z;

        p1.SetCoord(x1,y1,z1);
        p2.SetCoord(x2,y2,z2);
        p3.SetCoord(x3,y3,z3);

        if ((!(p1.IsEqual(p2,0.0))) && (!(p1.IsEqual(p3,0.0)))) {
            Vertex1 = BRepBuilderAPI_MakeVertex(p1);
            Vertex2 = BRepBuilderAPI_MakeVertex(p2);
            Vertex3 = BRepBuilderAPI_MakeVertex(p3);

            newWire = BRepBuilderAPI_MakePolygon(Vertex1, Vertex2, Vertex3, Standard_True);
            if (!newWire.IsNull()) {
                newFace = BRepBuilderAPI_MakeFace(newWire);
                if (!newFace.IsNull())
                    BuildTool.Add(aComp, newFace);
            }
        }

    }

    aSewingTool.Load(aComp);
    aSewingTool.Perform();
    _Shape = aSewingTool.SewedShape();
    if (_Shape.IsNull())
        _Shape = aComp;
}