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Parasolid XT Format Reference
April 2008
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Parasolid XT Format Reference
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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 ............................................................................ 3
Logical Layout ........................................................................................... 4
Schema ..................................................................................................... 5
Embedded schemas ................................................................................. 6
Physical layout .................................................................................................. 6
XT format .......................................................................................................... 7
Space compression ................................................................................... 8
Field types ................................................................................................. 8
Point .......................................................................................................... 9
Pointer classes ........................................................................................ 10
Variable-length nodes ............................................................................. 10
Unresolved indices .................................................................................. 11
Simple example ....................................................................................... 11
Physical Layout ....................................................................................... 13
Common header ..................................................................................... 13
Keyword Syntax .............................................................................................. 15
Text ......................................................................................................... 16
Binary ...................................................................................................... 17
bare binary ....................................................................................................... 17
neutral binary ................................................................................................... 18
Model Structure ....................................................................................... 20
Parasolid XT Format Reference
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Topology ................................................................................................. 20
General points ......................................................................................... 20
Entity definitions ...................................................................................... 20
Assembly ......................................................................................................... 20
Instance ............................................................................................................ 21
Body ................................................................................................................ 21
Region ............................................................................................................. 21
Shell ................................................................................................................. 22
Face ................................................................................................................. 22
Loop................................................................................................................. 23
Fin .................................................................................................................... 23
Edge ................................................................................................................. 24
Vertex .............................................................................................................. 24
Attributes ......................................................................................................... 24
Groups ............................................................................................................. 25
Node-ids .......................................................................................................... 25
Entity matrix ............................................................................................ 25
Representation of manifold bodies .......................................................... 26
Body types ....................................................................................................... 26
Schema Definition ................................................................................... 28
Underlying types ..................................................................................... 28
Geometry ................................................................................................ 29
Curves .............................................................................................................. 30
LINE ............................................................................................................ 31
CIRCLE ....................................................................................................... 32
ELLIPSE ..................................................................................................... 34
B_CURVE (B-spline curve) ........................................................................ 35
Parasolid XT Format Reference
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INTERSECTION ........................................................................................ 44
TRIMMED_CURVE ................................................................................... 48
PE_CURVE (Foreign Geometry curve) ...................................................... 50
SP_CURVE ................................................................................................. 52
Surfaces ........................................................................................................... 53
PLANE ........................................................................................................ 54
CYLINDER ................................................................................................. 55
CONE .......................................................................................................... 57
SPHERE ...................................................................................................... 59
TORUS ........................................................................................................ 60
BLENDED_EDGE (Rolling Ball Blend) .................................................... 62
BLEND_BOUND (Blend boundary surface) .............................................. 64
OFFSET_SURF ........................................................................................... 65
B_SURFACE .............................................................................................. 67
SWEPT_SURF ............................................................................................ 73
SPUN_SURF ............................................................................................... 74
PE_SURF (Foreign Geometry surface) ....................................................... 76
Point................................................................................................................. 77
Transform ........................................................................................................ 78
Curve and Surface Senses ............................................................................... 80
Geometric_owner ............................................................................................ 80
Topology ................................................................................................. 82
WORLD ...................................................................................................... 82
ASSEMBLY ................................................................................................ 83
INSTANCE ................................................................................................. 85
BODY .......................................................................................................... 87
REGION ...................................................................................................... 91
