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U3DTest - Java

This example illustrates how to embed U3D content (3 dimensional models) in PDF.

//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2018 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

import com.pdftron.pdf.*;
import com.pdftron.sdf.Obj;
import com.pdftron.sdf.SDFDoc;
import com.pdftron.common.PDFNetException;
import com.pdftron.filters.*;


public class U3DTest {
	
	static String input_path =  "../../TestFiles/";

	static void Create3DAnnotation(PDFDoc doc, Obj annots) throws PDFNetException
	{
		// ---------------------------------------------------------------------------------
		// Create a 3D annotation based on U3D content. PDF 1.6 introduces the capability 
		// for collections of three-dimensional objects, such as those used by CAD software, 
		// to be embedded in PDF files.
		Obj link_3D = doc.createIndirectDict();
		link_3D.putName("Subtype", "3D");

		// Annotation location on the page
		Rect link_3D_rect=new Rect(25, 180, 585, 643);
		link_3D.putRect("Rect", link_3D_rect.getX1(), link_3D_rect.getY1(),
			link_3D_rect.getX2(), link_3D_rect.getY2());
		annots.pushBack(link_3D);

		// The 3DA entry is an activation dictionary (see Table 9.34 in the PDF Reference Manual) 
		// that determines how the state of the annotation and its associated artwork can change.
		Obj activation_dict_3D = link_3D.putDict("3DA");

		// Set the annotation so that it is activated as soon as the page containing the 
		// annotation is opened. Other options are: PV (page view) and XA (explicit) activation.
		activation_dict_3D.putName("A", "PO");  

		// Embed U3D Streams (3D Model/Artwork).
		{
			MappedFile u3d_file=new MappedFile(input_path + "dice.u3d");
			FilterReader u3d_reader=new FilterReader(u3d_file);

			// To embed 3D stream without compression, you can omit the second parameter in CreateIndirectStream.
			Obj u3d_data_dict = doc.createIndirectStream(u3d_reader, new FlateEncode(null));
			u3d_data_dict.putName("Subtype", "U3D");
			link_3D.put("3DD", u3d_data_dict);
		}

		// Set the initial view of the 3D artwork that should be used when the annotation is activated.
		Obj view3D_dict = link_3D.putDict("3DV");
		{
			view3D_dict.putString("IN", "Unnamed");
			view3D_dict.putString("XN", "Default");
			view3D_dict.putName("MS", "M");
			view3D_dict.putNumber("CO", 27.5);

			// A 12-element 3D transformation matrix that specifies a position and orientation 
			// of the camera in world coordinates.
			Obj tr3d = 	view3D_dict.putArray("C2W"); 
			tr3d.pushBackNumber(1); tr3d.pushBackNumber(0); tr3d.pushBackNumber(0); 
			tr3d.pushBackNumber(0); tr3d.pushBackNumber(0); tr3d.pushBackNumber(-1);
			tr3d.pushBackNumber(0); tr3d.pushBackNumber(1); tr3d.pushBackNumber(0); 
			tr3d.pushBackNumber(0); tr3d.pushBackNumber(-27.5); tr3d.pushBackNumber(0);

		}

		// Create annotation appearance stream, a thumbnail which is used during printing or
		// in PDF processors that do not understand 3D data.
		Obj ap_dict = link_3D.putDict("AP");
		{
			ElementBuilder builder=new ElementBuilder();
			ElementWriter writer=new ElementWriter();
			writer.begin(doc);

			String thumb_pathname=input_path + "dice.jpg";
			Image image = Image.create(doc, thumb_pathname);
			writer.writePlacedElement(builder.createImage(image, 0.0, 0.0, link_3D_rect.getWidth(), link_3D_rect.getHeight()));

			Obj normal_ap_stream = writer.end();
			normal_ap_stream.putName("Subtype", "Form");
			normal_ap_stream.putRect("BBox", 0, 0, link_3D_rect.getWidth(), link_3D_rect.getHeight());
			ap_dict.put("N", normal_ap_stream);
		}
	}

	public static void main(String[] args)
	{
		String output_path = "../../TestFiles/Output/";
		PDFNet.initialize();
		try  
		{	 
			
			PDFDoc doc=new PDFDoc();
			Page page = doc.pageCreate();
			doc.pagePushBack(page);
			Obj annots = doc.createIndirectArray();
			page.getSDFObj().put("Annots", annots);

			Create3DAnnotation(doc, annots);
			doc.save((output_path + "dice_u3d.pdf"), SDFDoc.SaveMode.LINEARIZED,null);
			doc.close();
			System.out.println("Done");
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}

		PDFNet.terminate();
	}
}