In "BRL-CAD documentation Volume IV – Converting Geometry Between
BRL-CAD and Other Formats" different formats are given in which we can
convert BRL-CAD model i.e. .g format to another .xyz format. I convert
my .g file model into STL, VRML formats. Conversion with the given
command in this documentation is completed successfully but on
comparing my converted model with my original BRL-CAD model it looks
less accurate. My BRL-CAD model is shown below
http://picpaste.com/Screenshot_from_2014-06-26_06_01_52-QeIG2saC.png
and after converting into vrml, it looks like
http://picpaste.com/Screenshot_from_2014-06-26_06_17_14-27QhwzV0.png

I was reading documentation given at
http://brlcad.org/d/node/82
In this, there are three types of model representation
1: Implicit CSG representation
2: NURBS BREP representation
3: Polygonal BREP representation
Is there any format in which I can export my BRL-CAD model so that I
can get model similar to that as shown in BRLCAD. If yes then how many
of them are in following categories that export BRLCAD
1: CSG model into CSG model
2: CSG model into NURBS BREP
3: CSG model into Polygon BREP

Which path or format should I follow to get models in above categories.

Thanks

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