Currently Fusion 360 exports STEP files using AP214 (ISO 10303-214 has been withdrawn and is revised by ISO 10303-242). AP214 does not preserve any parametric information or design intent. Also, it does not export any manufacturing data.
It is not clear if AP242 export is going to be implemented, but it would also be great to be able to export AP238 data as well (AP238 is manufacturing data). STEP schemas can be merged such that data of different contexts could be exported in the one STEP file and share information (like underlying geometry and parametric information).
One of the main requirements for writing a custom exporter would be the ability to get at the parameters and constraints that define the positions of vertices and points. The API Reference Manual has listings for objects that represent all the constraint types and parameters, but it is not so clear how they might be associated with BRep or toolpath vertices.
Does the Fusion 360 API have enough access to the underlying model data and manufacturing data to produce STEP files that would be compliant with AP238 and AP242?
