BRLCAD_VolumeIV.pdf

BRL-CAD Tutorial Series:

Volume IV – Converting Geometry Between BRL-CAD

and Other Formats

by John R. Anderson and Eric W. Edwards

ARL-SR-121

May 2004

Approved for public release; distribution is unlimited.

*NOTICES

Disclaimers

The findings in this report are not to be construed as an official Department of the Army position unless

so designated by other authorized documents.

Citation of manufacturer’s or trade names does not constitute an official endorsement or approval of the

use thereof.

Destroy this report when it is no longer needed. Do not return it to the originator.

Note that the name BRL-CAD and the BRL-CAD eagle logo are trademarks of the U.S. Army.

Army Research Laboratory

Aberdeen Proving Ground, MD 21005-5068

ARL-SR-121

May 2004

BRL-CAD Tutorial Series:

Volume IV – Converting Geometry Between BRL-CAD

and Other Formats

John R. Anderson

Survivability/Lethality Analysis Directorate, ARL

Eric W. Edwards

SURVICE Engineering Company

Approved for public release; distribution is unlimited.

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May 2004

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February 2003–December 2003

5a. CONTRACT NUMBER

4. TITLE AND SUBTITLE

BRL-CAD Tutorial Series: Volume IV – Converting Geometry Between BRL-

CAD and Other Formats

5b. GRANT NUMBER

5c. PROGRAM ELEMENT NUMBER

6. AUTHOR(S)

John R. Anderson and Eric W. Edwards

5d. PROJECT NUMBER

DAAD17-03-D-001, D.O.9

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7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)

U.S. Army Research Laboratory

ATTN: AMSRD-ARL-SL-BE

Aberdeen Proving Ground, MD 21005-5068

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REPORT NUMBER

ARL-SR-121

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Approved for public release; distribution is unlimited.

13. SUPPLEMENTARY NOTES

14. ABSTRACT

Since 1979, the U.S. Army Research Laboratory has been developing and distributing the BRL-CAD constructive solid

geometry (CSG) modeling package for a wide range of military and industrial applications. The package includes a large

collection of tools and utilities, including an interactive three-dimensional geometry editor, raytracing and generic framebuffer

libraries, network-distributed image-processing and signal-processing capabilities, and an embedded scripting language.

As part of this effort, a multivolume tutorial series is being developed to assist users in the many features of the BRL-CAD

package. “Converting Geometry Between BRL-CAD and Other Formats,” which is the fourth volume in the series, discusses

pertinent characteristics of the BRL-CAD file format and provides specific instruction on converting to/from various other

modeling file formats. Also discussed are the steps involved in creating a new BRL-CAD converter and postconversion issues.

15. SUBJECT TERMS

BRL-CAD, geometry conversion, CAD, constructive solid geometry, boundary representation

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OF ABSTRACT

18. NUMBER

OF PAGES

19a. NAME OF RESPONSIBLE PERSON

John R. Anderson

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UNCLASSIFIED

b. ABSTRACT

UNCLASSIFIED

c. THIS PAGE

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410-278-7267

Standard Form 298 (Rev. 8/98)

Prescribed by ANSI Std. Z39.18

Contents

List of Figures

List of Tables

Acknowledgments

1. Introduction 1

1.1 Background, Purpose, and Scope ....................................................................................1

1.2 The Need for Conversion ................................................................................................2

2. Pertinent Characteristics of the BRL-CAD Format 4

2.1 CSG vs. BREP.................................................................................................................4

2.2 Prerelease 6.0 Database vs. Current Format....................................................................7

2.3 Converters Currently Available in BRL-CAD ................................................................8

3. Converting From/to ASCII 8

3.1 Converting From ASCII..................................................................................................9

3.2 Converting to ASCII .......................................................................................................9

4. Converting to BRL-CAD 10

4.1 General Information About Converting to BRL-CAD..................................................10

4.2 Converting From AutoCAD DXF Format ....................................................................10

4.3 Converting From Elysium Neutral Facetted Format .....................................................11

4.4 Converting From EUCLID Format ...............................................................................12

4.5 Converting From FASTGEN Format............................................................................13

4.5.1 FASTGEN4 .........................................................................................................14

4.5.2 Preprocessed FASTGEN Version 3/PATCH ......................................................14

4.6 Converting From IGES Format .....................................................................................15

4.7 Converting From Jack ...................................................................................................16

4.8 Converting From NASTRAN Format ...........................................................................16

4.9 Converting From Pro/E Format.....................................................................................17

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