Update on the STEPCDS initiative Wolfgang R' Haas

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Update on the STEP-CDS initiative Wolfgang R.
Haas
ISO TC184/SC4/WG3/T22 meeting,Seoul November
4-8, 2002
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Overview

• Implementers round table meetings and results
• Developments related to governmental building
  authorities
• Latest version of related Software
• Activities related to digital factory (3D-CAD)

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STEP-CDS round table meeting since Stockholm

• October 16th 2002 at RIB in Stuttgart
• Two new CAD System vendors as members
• Pit Cup Building services add on based on
  AutoCAD. Initiated by governmental building
  authority of the state of Niedersachsen
• BOCAD structural steel program. Initiated by
  DaimlerChrysler, Factory in Bremen
• Discussion of remaining issues related to
  MicroStation implementation, especially V8
• Total number of AEC CAD Systems now 7
• 5 implementations ready to use
• 2 under development
• Zeicon under negotiation
• Represent more than 70 of implemented AEC CAD
  Systems in Germany
• Discussion of ongoing open 2D-CAD data exchange
  issues
• Short presentation of STEP-FM project (facility
  management)
• Presentation and discussion of the results of the
  3D-CAD data exchange tests

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Current situation of STEP-CDS support in
Governmental building authorities

• State of Niedersachsen (very strong commitment)
• State of Schleswig Holstein
• State of Baden-Wuerttemberg
• State of Hessen
• In Negotiation
• State of Bavaria

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STEP-CDS Governmental projects

• New building of the Governmental authority for
  radiation protection
• New Project in the state of Baden Wuerttemberg
  done by Governmental Building Authority
• Participation and partial financing of the STEP
  FM Program

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Digital Factory Basic requirements for shape
representation

• Shapes bounded by the following types of surfaces
• Plane
• Circular Cylinder
• Cone
• Sphere
• Torus
• Boolen Trees
• Assembly structures
• These shapes build the basis for simple test
  cases
• All test examples designed with an experienced
  user of 3D process plant design

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Small tests part 3 participating systems

• CATIA V4, with AP214 converter from T-systems
• AutoCAD 2000 with standard AP214 converter
• AutoCAD Mechanical desktop with standard AP214
  converter
• MicroStation V8 with standard AP214 converter
• MicroStation V8 modelling extension with standard
  AP214 converter
• Unigraphics V18
• Step Tools visualisation Tool

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Test example 8

• Goal accuracy of length data in exporting system,
  on STEP file and importing system
• 2 Km long rectangular cylinder and 1.23456789 mm
  long addition as cube

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Test example 9

• Goal accuracy of angle data in exporting system,
  on STEP file and importing system
• 100 m long circular cylinder and followed by
  another 100 m long cylinder under an angle of
  0.01 degree. Joining section as toroidal surface

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Test example 9

• Goal correct joining of touching bodies

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Test example 14

• Goal Testing of instanciations of blocks, cells
  etc.

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Test example 15

• Goal Testing of the correct calculation of
  intersection curves including singularities

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Test example 16

• Goal Testing of the subtraction of a torus

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Test example 17

• Goal Testing of the subtraction of a torus from
  a rectangular pyramid. The result is two bodies.

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Test example 18

• Goal Testing of embedded groups.

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Small 3D tests, part 3 some interesting
observations

• CAD data were not exchanged as CSG models (as
  created) but the resulting b-rep
• Geometry exchange was OK
• Analytic surfaces (conical, spherical and
  toroidal surfaces) were exchanged using the
  respective STEP entities, no planar polygons
• The option Bezier at AP214 export yielded
  representations as bezier surfaces and
  considerable bigger files.
• Test results were given to system vendors 16th
  September 2002
• 1 months time frame for comments
• Then feedback to VDA as CD-ROM
• Round Table of implementors will be established

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Some useful information

• Boolean trees are useful in data exchange in
  factory design
• Advantage Intersection curves are not exchanged
  but must be computed in the receiving system.
  They are a major source of poor quality of
  exchange.
• Disadvantage The CAD system must be able to
  handle Boolean operations.
• Until now Boolean operations were not tested
  ProSTEP test rally's.
• B-spline surfaces are not generally inadequate to
  represent surfaces in an factory design
  environment. Special form of NURBS has advantages
  as follows
• Surfaces required in factory design can exactly
  be represented
• With few control points and weights
• Provides according to ProSTEP tests excellent
  results
• Widely used in animation programs such as
  softImage

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Possible road map

• Implementation of a round table of system vendors
  for factory design
• Debug existing AP214 implementations of CAD
  system platforms
• Upgrade implementations to cover boolean trees
  (if possible)
• Testing of applications built on top of these CAD
  systems such as Architectural Desktop, Triforma,
  FactoryCAD, TriCAD etc.
• Testing with real world 3D CAD Factory design
• Start pilot projects, evaluate results.
• Final goal Usage in day to day practice.

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Questions?