Adobe Acrobat 9 PRO Extended - Manual (Page 380)

374 USING ACROBAT 9 PRO EXTENDED
3D models and geospatial PDFs
Last updated 9/30/2011
4 To replace the fonts used in PMI, click Fonts, select Always Substitute, specify the font, and click OK.
If you select Always Substitute, you remove any reference in the PDF to the font used for PMI. If you leave Always
Substitute unselected, Acrobat substitutes any missing fonts. If the original fonts become available, they are used to
display PMI.
5 Click the Optimize tab and in the Format menu, choose a PRC setting:
PRC B-rep (Solid) Retains only the geometry information of the 3D model. This option produces the smallest files, but
polygons must be regenerated each time the file is opened. See “ Exporting geometry from 3D models ” on page 404.
PRC B-rep + Tessellation Retains the geometry of the 3D geometry and any saved polygon settings. If the 3D model
doesn’t include polygon settings, they’re generated from the geometry during conversion.
PRC Tessellation (Faceted) Retains the polygon settings of the 3D model or generates new polygons based on the
geometry.
6 Select a level of detail. To set precise measurements, select either User Defined (for visualization) or Controlled
Precision (for STL printing), and then click Advanced.
7 (Optional) To apply compression, select a PRC compression option. If you plan to export geometry, leave
Compress B-rep To unselected, or set the value to 0.001 mm.
Compressed PDFs are smaller but take longer to open than uncompressed PDFs. To save time, compress only when
you have to—after PDF conversion: Right-click the 3D model, and choose Optimize. This option is available only in
PDFs that were converted using PRC settings.
Note: When you secure a 3D PDF that contains geometry, avoid settings that restrict editing and printing the PDF.
Otherwise, it disables the option to export geometry.
Convert a 3D file using U3D settings
1 Choose File > Create PDF > From File, select the 3D CAD file, and click Open.
2 In the Conversion dialog box, click the Optimize tab, and choose a U3D conversion setting from the 3D Format In
PDF menu:
U3D ECMA 3 Ensures compatibility with Acrobat 8.1 and later and Adobe Reader® 8.1 and later.
U3D ECMA 1 (Reader 7.0 Compatible) Ensures compatibility with Acrobat 7.0 and later and Reader 7.0 and later.
3 Select a level of detail. To set precise measurements, select either User Defined (for visualization) or Controlled
Precision (for STL printing), and then click Advanced.
4 (Optional) For U3D ECMA 3 conversion, select Mesh Quality and specify a percentage.
5 Specify other options as needed and click OK.
About PRC and U3D conversion formats
When you create a PDF from a supported 3D file, the PDF stores 3D data as either PRC or U3D (Universal 3D) format,
depending on the settings you choose. Whether PRC or U3D settings are available in the Acrobat 3D Conversion
dialog box depends on which 3D application created the file you’re converting.
PRC is a 3D format that lets you create different representations of a 3D model. For example, you can save only a visual
representation that consists of polygons, or you can save the geometry that the model is based on. You can apply
compression during conversion to decrease file size, or afterward in Acrobat Pro Extended. By using PRC, you can
create PDFs that are interoperable with Computer Aided Manufacturing (CAM) and Computer Aided Engineering
(CAE) applications.