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BRL-CAD's most pressing need in the geometry file conversion category is support for the STEP file format, a.k.a "STandard for the Exchange of Product model data."  Step is a successor to the IGES file format and today is the major standard used for data exchange between CAD systems.
 
BRL-CAD's most pressing need in the geometry file conversion category is support for the STEP file format, a.k.a "STandard for the Exchange of Product model data."  Step is a successor to the IGES file format and today is the major standard used for data exchange between CAD systems.
 
== Partial Support ==
 
currently the tool step-g has partial support, and the toolkit https://github.com/stepcode/stepcode is branched into the src/other source tree.
 
  
 
==Defining ISO Documents==
 
==Defining ISO Documents==
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==Existing Open Source Tools==
 
==Existing Open Source Tools==
====Tools that work with EXPRESS (ISO10303 Part 11) schemas====
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===These tools work with EXPRESS (ISO10303 Part 11) schemas===
 
* [http://exp-engine.sourceforge.net/ Expresso], aka Express Engine, written in Lisp
 
* [http://exp-engine.sourceforge.net/ Expresso], aka Express Engine, written in Lisp
 
* [http://www.jsdai.net/ JSDAI], written in java
 
* [http://www.jsdai.net/ JSDAI], written in java
====Tools that generate C++ from an EXPRESS schema====
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===These tools generate C++ from an EXPRESS schema===
* NIST STEP Class Libraries
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* NIST STEP Class Libraries - this predates the current STEP specification, and the modifications necessary for it to compile on a modern computer mean that there are no guarantees that it produces valid output!
** There is a [https://github.com/mpictor/StepClassLibrary patched version] of the SCL that compiles with GCC 4.6
 
 
** [http://www.mel.nist.gov/msid/scl/SCL.htm Official NIST SCL site]
 
** [http://www.mel.nist.gov/msid/scl/SCL.htm Official NIST SCL site]
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** There is also a [http://code.google.com/p/fbics/source/list patched version] of the SCL that compiles with GCC 4.3.3
  
* ESA and NASA also have some tools (expressik, lightcpp, pyexpress) that can generate code from EXPRESS schema. For some years, ESA has planned to release some (or all) of the code as open source; however, they have many higher priorities (per email with a person at ESA).
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* ESA and NASA also have some tools (expressik, lightcpp, pyexpress) that can generate code from EXPRESS schema. However, it is difficult to find information on them. At one point, esa planned to release some (or all) of the code as open source; however, more recent queries have gone unanswered.
 
** Relevant google searches:
 
** Relevant google searches:
 
*** [http://www.google.com/search?q=iso10303-11+EXPRESS+SDAI+python+generate+c%2B%2B iso10303-11 EXPRESS SDAI python generate c++]
 
*** [http://www.google.com/search?q=iso10303-11+EXPRESS+SDAI+python+generate+c%2B%2B iso10303-11 EXPRESS SDAI python generate c++]

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