From SP3D to E3D, if you need intelligent graphics then you can go for conversion using Smart-Plant Interop Publisher.
Aveva is also having a solution for this conversion, but that's not commercialized. You can provide your SP3D Databases to Aveva, and they will convert it to E3D model.
hi Alan, AVEVA can do this for you as a service. You will get a fully intelligent model as a result.
If you want more details let me know.