ISO INTERNATIONAL STANDARD 14739-1 First edition 2014-12-15 Document management - 3D use of Product Representation Compact (PRC) format - Part 1: PRC 10001 Gestion de documents - Utilisation en 3D du format compact de représentation de produit (PRC) Partie 1: PRC 10001 Reference number IS0 14739-1:2014(E) Internatinal Organization for Standardization =Zhejiang Institute of Standardization 5956617 @IS02014 ovided by IHS under lic Not for Resale, 2015/3/11 02:21:21 IS0 14739-1:2014(E) COPYRIGHTPROTECTEDDOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland icensee=zZhejang nsitute of Standardization5956d IS0 2014 - All rights reserved Not for Resale, 2015/3/11 02:21:21 nited without license from IHS IS0 14739-1:2014 Contents Page Contents iii Foreword. 1 Scope.. 2. 3 Terms and definitions .. 2 4 Document syntax conventions.... 4.1 Conventions ... 4.2 2 5 PRC file concepts .. 5.1 The PRC file .. 5.2 5.3 Unique identifiers... 5.4 Current data values. 5.5 Userdata. 5.6 Units.. 5.7 Tolerances 5.8 5.9 Compressed geometry 5.10 Compressed tessellation 6 PRC file contents. 6.1 Fileheader. 6.2 Filestructure ... 11 6.3 PRC Schema... 13 7 PRC basic types 7.1 13 7.2 Uncompressed types... 7.3 8 Base entities ..21 8.1 General....... 21 8.2 Abstractroottypes... 21 8.3 Structure and assembly. 25 8.4 Miscellaneous Data.... ..45 8.5 8.6 Representation items ... 8.7 8.8 Tessellation... 8.9 Topology.... 114 8.10 Curve.. 150 8.11 8.12 Mathematical Operator.... 209 9 9.1 General.... 213 9.2 Enumeration Of Schema Tokens .. .214 Internatioal S02014andal.zights reserved ii vided by IHS under license Not for Resale, 2015/3/11 02:21:21 IS0 14739-1:2014 9.3 Schema Processing .. ..216 9.4 Schema Requirements and Examples.... 10 I/o Algorithms... .225 10.1 Getnumberofbitsusedtostoreunsignedinteger. 10.2 Makeportable32bitsunsigned. 225 10.3 Writebits. .225 10.4 Writestring... 10.5 Writefloatasbytes. ..226 10.6 Writecharacterarray.. .227 10.7 Writeshortarray ..... 10.8 Writecompressedintegerarray.... 229 10.9 Writecompressedindicearray... .229 10.10 Writeunsignedinteger.... 10.11 10.12 Writeintegerwithvariablebitnumber .. .230 10.13 Writeunsignedintegerwithvariablebitnumber... ...231 10.14 Writedoublewithvariablebitnumber.... ...231 10.15 Writenumberofbitsthenunsignedinteger. 232 10.16 Writecompressedentitytype... .232 10.17 10.18 Procedure For Writedouble.. .270 11 Tessellation Compression Support 11.1 General..... ..274 11.2 Huffman Algorithm. ..275 11.3 Basis Pseudocode... Annex A (informative) Example: Triangle . ..281 Annex B (informative) List of figures and tables . 283 Bibliography... andardization 5956617 IS0 2014-All rights reserved ithout license from IHS IS0 14739-1:2014 Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. ISo collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are different types of IsO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.o