Itextsharp'da 3d işlemleri

u3d dosya türlerini itextsharp kütüphanesini kullanarak açmamıza yarayan yazmış olduğum bir class güle güle kullanmanız dileğiyle.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using iTextSharp.text.pdf;
using iTextSharp.text;
using System.IO;

public void ThreeDPdf(string filePath, string Files3D)
{
    Document doc = new Document();
    PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(filePath,FileMode.Create));
    doc.Open();
    Rectangle rect = new Rectangle(100, 400, 500, 800);
    rect.Border = Rectangle.BOX;
    rect.BorderWidth = 0.5F;
    rect.BorderColor = new BaseColor(0xFF, 0x00, 0x00);
    doc.Add(rect);
    PdfStream stream3D = new PdfStream(new FileStream(Files3D, FileMode.Open), writer);
    stream3D.Put(PdfName.TYPE, new PdfName("3D"));
    stream3D.Put(PdfName.SUBTYPE, new PdfName("U3D"));
    stream3D.FlateCompress();
    PdfIndirectObject streamObject = writer.AddToBody(stream3D);
    stream3D.WriteLength();
    PdfDictionary dict3D = new PdfDictionary();
    dict3D.Put(PdfName.TYPE, new PdfName("3DView"));
    dict3D.Put(new PdfName("XN"), new PdfString("Default"));
    dict3D.Put(new PdfName("IN"), new PdfString("Unnamed"));
    dict3D.Put(new PdfName("MS"), PdfName.M);
    dict3D.Put(new PdfName("C2W"),                new PdfArray(new float[] { 1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28 }));
    dict3D.Put(PdfName.CO, new PdfNumber(235));
    PdfIndirectObject dictObject = writer.AddToBody(dict3D);
    PdfAnnotation annot = new PdfAnnotation(writer, rect);
    annot.Put(PdfName.CONTENTS, new PdfString("3D Model"));
    annot.Put(PdfName.SUBTYPE, new PdfName("3D"));
    annot.Put(PdfName.TYPE, PdfName.ANNOT);
    annot.Put(new PdfName("3DD"), streamObject.IndirectReference);
    annot.Put(new PdfName("3DV"), dictObject.IndirectReference);
    PdfAppearance ap = writer.DirectContent.CreateAppearance(rect.Width, rect.Height);
    annot.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, ap);
    annot.SetPage();
    writer.AddAnnotation(annot);
    // step 5            doc.Close();
}

Kullanımı :
Pdf3D pdf3d = new Pdf3D();pdf3d.ThreeDPdf("C:\3d.pdf", "c:\teapot.u3d");