How can make vtkpolydata by points?

[A.M_Shahpouri]

Hi Mathieu
thank you for answer to me

but I have a Big 3DList of point and by this way take alot!!! of time

        vtkPoints points = new();

        for (int z = 0; z <ZSize; z++)
        {
                for (int y = 0; y < YSize; y++)
                {
                    for (int x = 0; x <XSize; x++)
                    {         
                        if (IsInside(P[z][y][x]))
                        {
                            points.InsertNextPoint(x, y, z);
                        }
                    }
                }
            }
        }

        vtkPolyData polydata = new();
        polydata.SetPoints(points);

        vtkDelaunay3D delaunay = new();
        delaunay.SetInputData(polydata);
        //delaunay.SetTolerance(.00001);
        //delaunay.SetAlpha(100000);
        delaunay.Update();

        vtkDataSetMapper mapper = new();
        mapper.SetInputConnection(delaunay.GetOutputPort());

        vtkActor actor = new();
        actor.SetMapper(mapper);

        renderer.AddActor(actor );

and when run is not work in true way
like this

the problem in this photo : Some points (at the outer edges of the shape) are connected, which we don’t want to happen
like this

I want make a shape with point , which I had set in vtkPoints ( and don’t want to draw line between points automatically )
and I want make faster

thank you a lot for helping