3D PDF是重要的文件格式的原因之一是因为它不需要特殊的查看器。如果您在桌面计算机上有Adobe Acrobat查看器，那么大多数人都需要。
But what about mobile?
Adobe has versions of its reader for IOS (iPhone, and iPad), and Android. But, when you view a 3D PDF file with one of these programs, you’ll find that you don’t get 3D. You get a snapshot of the 3D. Just an image.
为了认真对待3D PDF，它需要一个好的移动查看器。真正的问题是谁应该开发它？
Adobe听起来像是合乎逻辑的选择。除了他们实际上不再进行PDF的3D部分的开发。他们几年前将该技术旋转到了Tech Soft 3D。
You may not be too familiar with Tech Soft 3D. But the software developers who make the CAD software you use are familiar with them. Tech Soft 3D develops and sells component software technologies that are used inside of CAD and high-end graphics applications.
我最近与Tech Soft 3D的Ron Fritz进行了交谈，他说他们考虑了需要3D PDF观看移动设备的3D PDF查看器的问题，并得出结论，他们应该开发它。不是因为他们可以赚很多钱。(In fact, they did the math, and it wasn’t all that favorable.) They decided they should develop a mobile 3D PDF viewer because it would help drive acceptance of 3D PDF—and that is important to the companies which license their HOOPS Publish component software, for creating 3D PDF files.
The 3D PDF Reader (available now for IOS devices) works hand-in hand with the mobile Adobe Reader. If you open a 3D PDF file in the Adobe Reader, you can click on the 3D image, and it will open it up using the 3D PDF reader. At that point, you can navigate around in 3D, and, if the image is an assembly, drill down to individual parts.
在此观众中，有一个特定的功能非常重要：对以PRC格式编码的3D数据的支持。
When 3D PDF first came out, it used a simplified format called U3D for representing 3D data. It was pretty good, but not really technologically advanced. Adobe shortly acquired an advanced technology called PRC, that was much more capable. PRC:
- Allows storage of large CAD files in a highly compressible form that is a fraction of the original size. The complete product structure of the parts defined by the CAD system can be contained in a PRC file.
- 可以代表产品制造信息（PMI），其中包括几何尺寸和公差（GD＆T）以及功能公差和注释（FT＆A）。
- Allows geometry use in CAD, CAM, and CAE applications. The geometry can be stored in either a tessellated or precise form.
- 正处于ISO标准化的路上。
The 3D PDF Reader supports assemblies, and lets you drill-down through the product structure, to individual parts. It also supports 3D GD&T and PMI.
根据我看到产品的演示，其性能非常好，其处理合理复杂的组件也是如此。尽管如此，在iOS上运行（或将来的Android），内存可能是一个问题。但是，我认为重要的是要了解3D PDF是一种面向文档的格式。它并不是真正用于进行数字模型的设计。
尽管3D PDF查看器能够显示U3D，但PRC是3D PDF的未来。当今的大多数CAD系统本地创建带有嵌入式U3D数据的3D PDF文件，而不是PRC，但这会改变。（我相信SpaceClaim是一个值得注意的例外。目前，它不仅可以编写基于U3D的3D PDF文件，还可以读写和编写基于PRC的3D PDF文件（与PMI）。，，，，including Tetra4D’s 3D PDF Converter (coupled with Adobe Acrobat X),Anark核心，，，，and PROSTEP PDF Generator 3D.
3D PDF读取器，现在可以适用于Apple iOS设备Apple App Store，，，，for $5.49.
No, it’s not free. I had a chat with Ron about this, and I came to the conclusion that five bucks is cheap enough that it won’t stop people from getting it. And it immediately gives Tech Soft 3D real feedback on interest in the product.
You might ask, what about Android? Ron told me that they wanted to see what the interest was in the IOS version, before they ship an Android version. My thought is that it’s going to be a no-brainer. There will be plenty of interest in both.
技术软3Dwww.techsoft3d.com
提交以下：3D CAD World，，，，3D打印•添加剂制造•立体光刻，，，，Software
