ISO10303 is a standard for exchange of product information. The standard is organized into a set of Application Protocols (AP). There are two APs that are supported in this release these being ISO10303-203 (Configuration Controlled Design) conformance classes 1-4, and ISO10303-214 (Core Data for Automotive Mechanical Design Process) conformance classes 1-2. The import and export of this data is supported via ISO10303-21 Physical file exchange.
Wireframe models – A collection of curves written out as a Wireframe model.
Surface models – A collection of surfaces written out as a surface model.
Manifold Shells – A collection of stitched surfaces that do not describe a volume is saved out as a G3 Manifold Shell.
Brep Solids – Stitched geometry that describes a closed volume is written out as a G5 Brep Solid.
Hybrid models – A combination of wireframe, surface, manifold shells and BREP solids.
The user can save the model and all the geometry in an Alias Stage, into a STEP product. This is performed by choosing the Hybrid Models option (the default).
If, because of contractual or system limitations on the receiving side, a Hybrid model cannot be used, you can select single model representations, as explained in the following table.
| Any Alias Geometry | Hybrid Models |
| Alias Shells (Closed) | G5 BREP Solids |
| Alias Shells (Closed/Open) | G3 Manifold Shells |
| Alias Surface | G2 Surface Models |
| Alias Curves | G2 Wireframe Models |
There is an inherent loss of information outputting an Alias Shell as a wireframe.
When you do not have any shells, you can not get anything from manifold shells option. You can get the unstitched surfaces transferred by using hybrid option.
The other options are selective to shells (only), surfaces (only) or wires (only).
If the Alias model is a set of trimmed surfaces; the model cannot be output as a BREP Solid.
When you choose Model Type option > Manifold Shells or Hybrid Models, two Surface Geometry options are made available.
