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Parasolid XT Format Reference
October 2006
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© 2006. UGS Corp. All rights reserved.
NOTICE: All information contained herein is the property of UGS Corp. No part of this publication (whether
in hardcopy or electronic form) may be reproduced, stored in a retrieval system, or transmitted, in any form or
by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written
permission of UGS Corp. Please note that the content in this guide is protected under copyright law even if it is
not distributed with software that includes an end user license agreement. UGS, Parasolid and Transforming the
process of innovation are registered trademarks or trademarks of UGS Corp. in the United States and/or other
countries. All other trademarks are the property of their respective owners.
This publication and the information herein are furnished AS IS, are furnished for informational use only, are
subject to change without notice, and should not be construed as a commitment by UGS Corp. UGS Corp.
EXPRESSLY DISCLAIMS AND ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS
OR INACCURACIES THAT MAY APPEAR IN THE INFORMATIONAL CONTENT CONTAINED IN
THIS GUIDE, MAKES NO WARRANTY OF ANY KIND (EXPRESS, IMPLIED, OR STATUTORY) WITH
RESPECT TO THIS PUBLICATION, AND EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES OF
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSES, AND NONINFRINGEMENT OF
THIRD-PARTY RIGHTS.
This document is subject to all United States government laws, regulations, orders or other restrictions
regarding export from the United States of services, commodities, software, technology or derivatives thereof,
as such laws, regulations, orders, or other restrictions may be enacted, amended or modified from time to time.
Notwithstanding anything to the contrary in this document, You will not directly or indirectly, separately or as
part of a system, export or reexport any UGS Corp. services, commodity, software, technology or derivatives
thereof or permit the use by or shipment of same to: (i) a national or resident of Cuba, Iran, North Korea, Sudan,
Syria, or any other country embargoed or restricted by the United States; (ii) anyone or any entity on the U.S.
Treasury Department's List of Specially Designated Nationals and Blocked Persons, List of Specially
Designated Terrorists or List of Specially Designated Narcotics Traffickers, or the U.S. Commerce
Department's Denied Parties List or the U.S. Commerce Department's Entity List; or (iii) any country or
destination for which the United States government or a United States governmental agency requires an export
license or other approval for export without first having obtained such license or other approval. You
acknowledge and agree that, unless a validated export license is obtained from the United States Department of
Commerce or other applicable authority where required, You will not use the UGS Corp. services, commodities,
software, technology or derivatives thereof in the design, development, production, stockpiling or use of nuclear
weapons, missiles, or chemical or biological weapons. You agree to indemnify and hold UGS Corp. harmless
from and against all claims, losses, damages and expenses arising out of or resulting from Your failure to
comply with the provisions set forth in this Section.
Parasolid XT Format Reference
- i -
Table of Contents
Introduction to the Parasolid XT Format ................................................... 1
Types of File Documented ........................................................................ 1
Text and Binary Formats........................................................................... 2
Standard File Names and Extensions....................................................... 2
The Alternative Solution............................................................................ 2
Logical Layout........................................................................................... 3
Schema..................................................................................................... 4
Embedded schemas ................................................................................. 5
Physical layout .................................................................................................. 5
XT format.......................................................................................................... 6
Space compression................................................................................... 7
Field types................................................................................................. 7
Point.......................................................................................................... 8
Pointer classes.......................................................................................... 9
Variable-length nodes ............................................................................... 9
Unresolved indices.................................................................................. 10
Simple example....................................................................................... 10
Physical Layout....................................................................................... 12
Common header ..................................................................................... 12
Keyword Syntax.............................................................................................. 14
Text ......................................................................................................... 15
Binary...................................................................................................... 16
bare binary....................................................................................................... 16
neutral binary................................................................................................... 16
Model Structure....................................................................................... 18
Parasolid XT Format Reference
- ii -
Topology ................................................................................................. 18
General points......................................................................................... 18
Entity definitions...................................................................................... 18
Assembly......................................................................................................... 18
Instance............................................................................................................ 19
Body ................................................................................................................ 19
Region ............................................................................................................. 19
Shell................................................................................................................. 20
Face ................................................................................................................. 20
Loop................................................................................................................. 21
Fin.................................................................................................................... 21
Edge................................................................................................................. 22
Vertex.............................................................................................................. 22
Attributes......................................................................................................... 22
Groups ............................................................................................................. 23
Node-ids .......................................................................................................... 23
Entity matrix ............................................................................................ 23
Representation of manifold bodies.......................................................... 24
Body types....................................................................................................... 24
Schema Definition................................................................................... 26
Underlying types ..................................................................................... 26
Geometry ................................................................................................ 27
Curves.............................................................................................................. 28
LINE............................................................................................................ 29
CIRCLE....................................................................................................... 30
ELLIPSE ..................................................................................................... 32
B_CURVE (B-spline curve)........................................................................ 33
Parasolid XT Format Reference
- iii -
INTERSECTION ........................................................................................ 42
TRIMMED_CURVE................................................................................... 46
PE_CURVE (Foreign Geometry curve)...................................................... 48
SP_CURVE................................................................................................. 50
Surfaces ........................................................................................................... 51
PLANE........................................................................................................ 52
CYLINDER................................................................................................. 53
CONE.......................................................................................................... 55
SPHERE...................................................................................................... 56
TORUS........................................................................................................ 58
BLENDED_EDGE (Rolling Ball Blend).................................................... 59
BLEND_BOUND (Blend boundary surface).............................................. 62
OFFSET_SURF........................................................................................... 63
B_SURFACE .............................................................................................. 65
SWEPT_SURF............................................................................................ 71
SPUN_SURF............................................................................................... 72
PE_SURF (Foreign Geometry surface)....................................................... 74
Point................................................................................................................. 75
Transform........................................................................................................ 76
Curve and Surface Senses ............................................................................... 78
Geometric_owner............................................................................................ 78
Topology ................................................................................................. 80
WORLD ...................................................................................................... 80
ASSEMBLY................................................................................................ 81
INSTANCE ................................................................................................. 83
BODY.......................................................................................................... 85
REGION...................................................................................................... 88
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