Avoiding seam in 3D cylinder model

Question

I have this texture representing internal area of a pipe:

I have created a simple cylinder model (GeometryModel3D) by dissecting the above texture to a grid of points and than wrapping this to form a cylinder, then mapping the above texture to it (each square on a grid having two triangles):

The left and right edges of the texture meet at the above black seam line, which is unwanted.

I could not use single vertex point for smooth continuation there, because that point corresponds to both 0 and 360 degrees which is single angle, but two distinct points on edges of the 2D texture.

So I have used pairs of vertices on the same location but each corresponding to different point in the source texture.

Is there anything I can do to hide the seam line?

Model creation code:

    private void SceneViewerWindowOnLoaded(object sender, RoutedEventArgs e)
    {
        var imageSource = new BitmapImage(new Uri("pack://application:,,,/Resources/out1.jpg"));

        var meshGeometry3D = new MeshGeometry3D();

        double circumference = imageSource.PixelWidth;
        double radius = (circumference / (2.0 * Math.PI));

        double angleSegment = (2.0 * Math.PI / SegmentCountTrans);

        double sizeSegmentLong = ((double)imageSource.PixelHeight / SegmentCountLong);
        double sizeSegmentTrans = ((double)imageSource.PixelWidth / SegmentCountTrans);

        for (int indexSegmentLong = 0; indexSegmentLong < SegmentCountLong; indexSegmentLong++)
        {
            double depth = (indexSegmentLong * sizeSegmentLong);

            for (int indexSegmentTrans = 0; indexSegmentTrans < SegmentCountTrans; indexSegmentTrans++)
            {
                meshGeometry3D.Positions.Add(GetVertexPosition(indexSegmentTrans, depth, radius, angleSegment));
                meshGeometry3D.TextureCoordinates.Add(new Point(indexSegmentTrans * sizeSegmentTrans, depth));
            }

            // add one extra vertex representing 360 degrees for complete wrap-around
            meshGeometry3D.Positions.Add(GetVertexPosition(SegmentCountTrans, depth, radius, angleSegment));
            meshGeometry3D.TextureCoordinates.Add(new Point(SegmentCountTrans * sizeSegmentTrans, depth));
        }

        meshGeometry3D.TriangleIndices.Clear();

        for (int indexSegmentLong = 0; indexSegmentLong < (SegmentCountLong - 1); indexSegmentLong++)
        {
            for (int indexSegmentTrans = 0; indexSegmentTrans < SegmentCountTrans; indexSegmentTrans++)
            {
                int indexCurrent = (indexSegmentLong * (SegmentCountTrans + 1) + indexSegmentTrans);

                meshGeometry3D.TriangleIndices.Add(indexCurrent);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + 1);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + SegmentCountTrans + 1);

                meshGeometry3D.TriangleIndices.Add(indexCurrent + SegmentCountTrans + 1);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + 1);
                meshGeometry3D.TriangleIndices.Add(indexCurrent + SegmentCountTrans + 2);
            }
        }

        var geometryModel3D = new GeometryModel3D
                            {
                                Geometry = meshGeometry3D,
                                Material = new DiffuseMaterial
                                           {
                                               Brush = new ImageBrush(imageSource)
                                           }
                            };

        this.SceneViewer.Model = geometryModel3D;
    }

    private static Point3D GetVertexPosition(int indexSegmentAngle, double depth, double radius, double angleSegment)
    {
        double angle = (StartAngle + indexSegmentAngle * angleSegment);

        return new Point3D(
            radius * Math.Cos(angle),
            radius * Math.Sin(angle),
            -depth);
    }

XAML code for the Viewport3D element containing the model:

<Viewport3D x:Name="Viewport3D">
        <Viewport3D.Camera>
            <PerspectiveCamera x:Name="Camera" Position="0.0,0.0,0.0" LookDirection="0.0,0.0,-1.0" UpDirection="0.0,1.0,0.0" FieldOfView="90"/>
        </Viewport3D.Camera>
        <ModelVisual3D>
            <ModelVisual3D.Content>
                <AmbientLight Color="White"/>
            </ModelVisual3D.Content>
        </ModelVisual3D>
        <ModelVisual3D x:Name="ModelVisualModel"/>
    </Viewport3D>

Answer 1

When you create your image brush try setting the TileMode to TileMode.Tile and ViewportUnits to BrushMappingMode.Absolute. If that still doesn't work then post a follow-up comment here and I'll try to reproduce it on my end.