Parasolid XT Format Reference - 13thmonkey.org

1 1 Parasolid XT Format Reference October 2006 Parker s House 46 Regent Street Cambridge CB2 1DP UK Tel: +44 (0)1223 371555 Fax: +44 (0)1223 316931 email: Web: 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.

2 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.

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6 Parasolid XT Format Reference - i - Table of Contents Introduction to the Parasolid XT Format ..1 Types of File Documented ..1 Text and Binary Standard File Names and The Alternative Solution ..2 Logical Layout ..3 Schema ..4 Embedded schemas ..5 Physical layout ..5 XT Format ..6 Space Field Point ..8 Pointer Variable-length nodes ..9 Unresolved Simple Physical Layout ..12 Common header ..12 Keyword Syntax ..14 Text ..15 Binary ..16 bare binary ..16 neutral Model Parasolid XT Format Reference - ii - Topology ..18 General Entity definitions.

7 18 Assembly ..18 Body ..19 Region ..19 Face ..20 Vertex ..22 Attributes ..22 Groups ..23 Node-ids ..23 Entity matrix ..23 Representation of manifold Body types ..24 Schema Definition ..26 Underlying types ..26 Geometry ..27 LINE ..29 ELLIPSE ..32 B_CURVE (B-spline curve)..33 Parasolid XT Format Reference - iii - INTERSECTION ..42 PE_CURVE (Foreign Geometry curve) ..48 SP_CURVE ..50 Surfaces ..51 PLANE ..52 CONE ..55 SPHERE ..56 TORUS ..58 BLENDED_EDGE (Rolling Ball Blend) ..59 BLEND_BOUND (Blend boundary surface)..62 B_SURFACE.

8 65 SWEPT_SURF ..71 PE_SURF (Foreign Geometry surface) ..74 Transform ..76 Curve and Surface Senses ..78 Geometric_owner ..78 Topology ..80 WORLD ..80 INSTANCE ..83 REGION ..88 Parasolid XT Format Reference - iv - VERTEX ..93 EDGE ..94 Associated Data ..96 POINTER_LIS_BLOCK:..97 ATT_DEF_ID ..98 ATTRIB_DEF ..99 ATTRIBUTE ..103 REAL_VALUES ..106 CHAR_VALUES ..106 UNICODE_VALUES ..106 POINT_VALUES ..107 VECTOR_VALUES ..107 AXIS_VALUES ..107 TAG_VALUES ..108 MEMBER_OF_GROUP ..110 Node Node System Attribute Definitions.

9 116 Parasolid XT Format Reference - v - Hatching ..116 Planar Hatch ..117 Radial Hatch ..118 Parametric Hatch ..118 Density Attributes ..119 Density (of a body)..119 Region Density ..119 Face Density ..120 Edge Density ..120 Vertex Parasolid XT Format Reference - vi - Parasolid XT Format Reference - 1 - Introduction to the Parasolid XT Format This Parasolid Transmit File Format manual describes the formats in which Parasolid represents model information in external files. Parasolid is a geometric modeling kernel that can represent wireframe, surface, solid, cellular and general non-manifold models.

10 Parasolid stores topological and geometric information defining the shape of models in transmit files. These files have a published Format so that applications can have access to Parasolid models without necessarily using the Parasolid kernel. The main audience for this manual is people who intend to write translators from or to the Parasolid transmit Format . Reading and writing transmit files are significantly different problems. Reading is simply a question of traversing the transmit file and interpreting the records stored within it. Writing is a significantly harder process; as well as getting the data Format of the transmit file correct applications must also ensure that the many complex and subtle inter-relationships between the geometric nodes in the file are satisfied.