The Rhino3D v3 Bonus Tools set currently incudes two different
GHS Import / Export routines, and is still under development.
"GHS Export File (*.gf)" option is not fully operational
at this time, and it will not produce a valid GHS compatible geometry.
DO NOT USE IT.
To save a valid GHS-compatible geometry file from a Rhino surface
model, proceed as follows:
1. make sure that the surfaces you select are representative of
the model, or the desired portions of the model, to be used for
calculation purposes in GHS. In particular, be attentive to holes
in the surfaces (which may duly or unduly affect the hydrostatics
hull envelope), over-defined models (too many unnecessary surfaces),
in the Rhino command line, type AttachGHSdata (Rhino will automatically
type the command for you after only Attach), and select the desired
options in the dialog.
3. once the desired sections have been generated and verified,
save the GHS compatible geometry file with:
4. File / Save As, scroll to the bottom of the file formats available,
and select :
(BONUS) GHS Geometry File (*.gf).
NOT USE THE "GHS Export File (*.gf)" option.
bonus Tools to obtain the GHS export option