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I have been trying to find a way to import STEP files into Geant4 off and on for the last couple of years. In mid-2008 I successfully used the free (technically "trial") version of FASTRAD to convert a 111-element STEP file into GDML, which I then imported into Geant4. In early 2009 I renewed my 1-year free license to FASTRAD and attempted to reproduce this conversion; however, it appears that a free license to the current version of FASTRAD now limits GDML export to 20 elements. (I was successful in converting six- and seven-element STEP files into GDML; FASTRAD choked on some longer, 31 to 34 MB, STEP files during the import stage.)
In Googling around, I found that FASTRAD had been developed under the REAT-MS program managed by Qinetiq for ESA. I saw that another tool, called "Open Frontier," had been created in parallel with this by etamax in Germany. Does anybody know if this software is available to the broader Geant4 community? It was used as the foundation of the ESABASE2 debris and meteoroid hazard analysis system; I have sent them a query to see about getting access to this, but have not received a reply (I have also not received a reply from TRAD about the cost of the full version of FASTRAD). The etamax.de website contains, as far as I could find, no mention of Open Frontier.
The final option I found was a non-GDML route using a proprietary STEPTools format that Geant4 can also read. There used to be a "ST-Viewer" application available that could translate STEP files into this format (*.geom and *.tree files); however, it can now only be obtained as part of the full ST-Developer suite, and there's no way I'd be able to persuade my company to shell out the money for a professional CAD tool for a scientist like me instead of a real "tube driver"!
So -- does anybody know how to get hold of Open Frontier, or is there another viable option I've not found?