Mesh Simplification Problem


#1

Hello!
I have some problem with Reducer.
I have STL model, which loaded in my App by Helix-Toolkit.
And I want to reduce number of verticies of the model. I wrote this method:

    private int OptimazeModel(Geometry3D geometry)
    {
        var meshModel = geometry as MeshGeometry3D;

        DMesh3 dmesh = new DMesh3(MeshComponents.VertexNormals);

        Debug.Print($"Raw: numbers of vertecies: {meshModel.Positions.Count}, " +
            $"numbers of nomals {meshModel.Normals.Count}, " +
            $"numbers of triangles {meshModel.TriangleIndices.Count}");

        for (int i = 0; i < meshModel.Positions.Count; i++)
        {
            var idx = meshModel.TriangleIndices[i];
            dmesh.AppendVertex(
                new NewVertexInfo(
                    new Vector3d(
                        meshModel.Positions[idx].X, 
                        meshModel.Positions[idx].Y, 
                        meshModel.Positions[idx].Z),
                    new Vector3f(
                        meshModel.Normals[idx].X,
                        meshModel.Normals[idx].Y,
                        meshModel.Normals[idx].Z)
                    ));

            dmesh.AppendTriangle(new Index3i(idx));
        }

        if (dmesh.CheckValidity(eFailMode: FailMode.DebugAssert))
            Debug.Print("Check - Ok");
        else
            Debug.Print("Check - Error");

        Reducer reducer = new Reducer(dmesh);

        reducer.ReduceToTriangleCount(1000);

        Debug.Print($"Reduced: number of vertecies: {reducer.Mesh.VertexCount}");

        return reducer.Mesh.VertexCount;
    }

So, I have an output:
Raw: numbers of vertecies: 25368, numbers of nomals 25368, numbers of triangles 25368
Check - Ok
ReducedL number of vertecies: 25368

And haven’t any exceptions. But model is not reduced, What I do wrong?
Thanks a lot!