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Enter the Third Dimension
by Michael Dakan
Communicating with team members and clients can sometimes be challenging because they don’t have access to all the software you use — particularly advanced CAD applications. But with Adobe® Acrobat® 7.0 Professional, you can insert 3D models direcly into Adobe PDF documents, and people using free Adobe Reader® can interact with and comment on your designs.
In this issue of Acrobat Insider for AEC, I explain how to insert 3D files in Universal 3D file format (U3D) into Adobe PDF documents, create and manage custom 3D views, and add bookmarks to make it easy for recipients to view and manipulate your 3D models interactively. (To learn more about U3D files, see the 3D Industry Forum website.)
Important: To get the most support for 3D files, you need to use Acrobat Professional v. 7.0.7 or later (you can download the update here). Also, remind recipients of your files to update to the latest version of Adobe Reader® 7.0.7, available for free from the Adobe website, as well.
Add 3D Designs to an Adobe PDF Document
The 3D design you add can come from a variety of sources. You can:
You can also create Adobe PDF pages containing 3D designs within Acrobat 7.0.
Under Preview Image, you can select a static image that will appear when the Adobe PDF file is first opened (in previous versions of Acrobat, this image was called a “poster”). It can be a view you select from the 3D design itself, or it can be a photorealistic image in a separate graphics file, such as a JPEG or bit-map raster image. This image is what the user clicks to activate the 3D content or start an animation.
Use the 3D Tool command to add a 3D file to an Adobe PDF document.
After you’ve added the 3D design to the Adobe PDF document, you can modify it. Using the Select Object or 3D tools, double-click the image. In the 3D Properties dialog box, you can specify startup actions, change the content, select a new preview image, resize or move the content, and more.
Navigate 3D Designs Using Views and Bookmarks
You can use the interactive navigation tools, such as Rotate, Pan, and Zoom, to display the 3D content in a variety of ways. If you want to make a particular view available to your users, such as the front or side, you can define a new named view using the Manage Views feature. Such views enable users to quickly jump to an area of interest that then serves as the starting point to interactively navigate the 3D design.
For example, suppose you’re conferring with clients by phone. By creating custom views of a 3D design in an Adobe PDF and sending it to clients before the call, you can guide the discussion of specific design issues and illustrate the design options that you want to present.
Adobe Acrobat 7.0.7 Professional also includes the Cross Section tool, which enables you to create a sectional view of a 3D model. This tool works just as it does in Adobe Acrobat 3D, helping you communicate design and documentation concepts and details easily and effectively.
To help others use the 3D tools, you can add instructions in the document itself with the Text Box or Typewriter Tool — for instance, “Click the image to view the interactive 3D model” or “To see the inside of the building, select Interior from the Views list.”
Use bookmarks to guide users to different views of your 3D model.
Collaborate and Help Protect Your Work
In past Insiders, we’ve discussed using Adobe PDF files to manage review and comment cycles as a project progresses (Acrobat Insider #4) and to control the security and use of your valuable design information (Acrobat Insider #7). Reviewers can add notes and comments to 3D designs exactly as they would to other PDF content, and tracking the feedback is just as easy. With the security tools in Acrobat 7.0, you can help protect proprietary information by adding passwords and limiting what recipients can do or change in your files.
Used together, these comprehensive and versatile tools can make your job easier — and make you more productive. They help you communicate design concepts and construction methods more effectively, they make the design and documentation process run more smoothly, and they enable your team and clients to understand your work more clearly.
Click the Model Tree button on the 3D Toolbar to display all the views in the model.
The 3D tools built into Acrobat 7.0.7 may be all that you need to add, enhance, and control 3D content in Adobe PDF documents. But if you want to create 3D content for use in Adobe PDF documents and you often work with 3D designs and presentations, I would strongly recommend that you investigate Adobe Acrobat 3D. Acrobat 3D enables you to create complete 3D PDF files quickly and easily from CAD and other 3D formats, and it automates many of the steps involved in working with and manipulating 3D content.
First, be aware that a raster image used as a background in a CAD file can be quite large, especially if it’s a high-resolution aerial photograph underlying an entire drawing. Predictably, the size of these background images directly affects the size of the Adobe PDF files that include them. To reduce the size of the Adobe PDF, you can try inserting a lower resolution image as a background and cropping the image so that it occupies only the area of your drawing where it's needed.
Next, search Help in Acrobat for “optimize" and read the topics "Reducing Adobe PDF file size" and "Using PDF Optimizer." These tips for balancing file size vs. readability will help you reach an acceptable compromise in the compression settings used in the conversion process.
Another way to trim file size is to create the Adobe PDF file by using the Print command in your CAD program instead of the PDFMaker command or button. Be aware, however, that this technique removes much of the intelligence of a CAD file, such as layers and scale, because it bases the Adobe PDF file on the image on screen at the time the file is created and ignores all other CAD information in the original file.
Have you discovered a good way to reduce file size and still maintain high readability in your Adobe PDF files made from CAD drawings? If you have, write up your tip and send it in. If we publish it, we’ll send you a free Cadalyst t-shirt!
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