(Product Representation Compact)
is a 3D data structure and file format used to embed 3D interactive data and models
into a PDF file. The format allows for highly compressed geometric representations,
with varying levels of tessellated surface geometry spatial tolerance.
In exact forms of representations, it may also include precise tessellations
or BREP curved surface data types. Dimensional and associated metadata
may also be included as PMI annotations within the PRC encoding.
The PRC encoding scheme is part of the published ISO specification
PDF/Engineering ISO-24517-1:2008 International Standard.
PDF3D products include PRC for highly effective compression and 3D
representations in 3D technical documents.
Note that aspects of the PDF3D implementation are the subject of granted and pending
patents. Products including PRC encoding include:
Examples of 3D PDF files with PRC encoding are available on the sample