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    1. Home
    2. 3D File Formats
    3. PRC

    What's on this Page

      • The PRC file formats
      • What is a Product Representation Compact (PRC) file?
        • Product Representation Compact (PRC) File Format specification
      • What is a MobiPocket e-book file with PRC extension
        • Mobipocket PRC file format specifications
      • References

    The PRC file formats

    The “.prc” extensions are being used for Product Representation Compact 3D file format and an e-book file format by MobiPocket.

    What is a Product Representation Compact (PRC) file?

    PRC (Product Representation Compact) is a 3D file format that is optimized to store, load, and display 3D data especially coming from CAD (Computer-Aided Design) systems. It is a sequential binary file, written in a portable way. PRC can be used to embed 3D data in a PDF file. PRC supports most of the mains constructs of CAD such as assemblies and parts, trees of 3D entities, exact geometry representation, triangulated representation, and markup. PRC uses the .prc extension and the internet media type used is model/prc.

    PRC is a multipurpose file format that based on its usage can either be stored using regular compression to directly represent CAD data or be stored using high compression to reduce the file size. The 3D data stored in a PDF using PRC format is interoperable with CAM and CAE applications.

    Product Representation Compact (PRC) File Format specification

    A PRC file has one main header section followed by one or more file structures followed by one model file at the end. A file structure has one header followed by the following data sections:

    • Globals: It contains the referenced file structures and colors, line styles, and coordinate systems for each tree entity of the file structure.
    • Tree: It contains a description of the tree of items like product occurrences, part definitions, representation items, and markup.
    • Tessellation: It contains all the tessellated(triangulated) data in the leaf entities of the tree(representation items and markups).
    • Geometry: It contains all exact geometry and topology data of the leaf entities of the tree(representation items).
    • Extra geometry: It contains the summary data of the geometry. This allows the file to be partially loaded without loading the entire geometry.

    The following is the structure of a typical PRC file.

    PRC Header
    
    File Structure #1
    - Header for File Structure #1
    - Globals for File Structure #1
    - Tree for File Structure #1
    - Tessellation for File Structure #1
    - Geometry for File Structure #1
    - Extra Geometry for File Structure #1
    
    File Structure #2
    ...
    
    File Structure #n
    - Header for File Structure #n
    - Globals for File Structure #n
    - Tree for File Structure #n
    - Tessellation for File Structure #n
    - Geometry for File Structure #n
    - Extra Geometry for File Structure #n
    
    PRC model file data
    

    What is a MobiPocket e-book file with PRC extension

    An e-book file format which is introduced by a French company called Mobipocket is also using the extension “.prc”. Initially, the Mobipocket launched a free application for multiple smart devices like, tablet pcs, PDAs and smartphones. The “.prc” extension is actually identical to .mobi but is used particularly for PDAs which only support .prc or .pdb extensions.

    Mobipocket PRC file format specifications

    The MobiPocket PRC file format is based on the Open eBook standard using XHTML and also it can include JavaScript and frames. Support for native SQL queries to be used with embedded databases is also available.

    The Mobipocket Reader has a home page library. Readers can insert blank pages in any part of a book and add variable drawings. The objects like Annotations, bookmarks, corrections, notes, and drawings are manageable from a single location. Images are converted to GIF format and have a maximum size of 64K which is sufficient for mobile phones with small screens. Mobipocket Reader has the electronic bookmarks, and a built-in dictionary.

    The reader has a full screen mode for reading and support for many PDAs, Communicators, and Smartphones. The Mobipocket products support most Palm operating systems, Windows, Symbian, BlackBerry, but not the Android. The reader works under Linux or Mac OS X using WINE.

    References

    • PRC - Wikipedia
    • PRC Format Specification
    • Comparison of e-book formats - By Wikipedia

    See Also

    • KT File Format
    • PY File Format
    • Xvid File Format
    • F4V File Format
    • AVIF File Format
     
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