These are file formats for CAD model exchange:
SAT - a proprietary but published format for the storage and
transmission of models created by the solid modeler ACIS from
Spatial Technology. ACIS is the kernel modeler in quite a
number of CAD systems.
DXF - a proprietary format for the transmission of AutoCAD data, but
widely used by other PC-based systems, I believe.
VDA-FS - a German standard for the transmission of CAD surface data,
mainly for free-form surfaces used in the automotive industry
IGES - a general CAD data transfer format covering a range of model
types from wireframe up to boundary representation solid models.
This is a US standard, and in wide use by industry. IGES
development will shortly terminate, and users will be encouraged
to migrate to STEP
STEP - an international standard (ISO 10303) for product data exchange,
under active development. It currently includes all of IGES'
capability in the mechanical engineering area, also that of
VDA-FS, and will eventually cover a wide range of product types
and product life-cycle stages. There is at present no specific
RP capability, athough there is a format corresponding to STL for
pure shape models. You can find more at http://www.nist.gov/sc4.
It is likely that work will begin soon on RP-related data including
slice formats, materials data and so on.
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