I don't know if there has been a change to Solidworks recently but my old workflow for importing scan data to surfaces that I can use in modelling seems to not work now.

To be clear I am scanning a vehicle to create background geometry for modelling new parts, I am not trying to make watertight solids with the scans, or turn the scans into useable parts. But, I do want to be able to measure/project/cut sections with the resulting surfaces. Also I'm happy if the surfaces I get at the end are literally the individual triangles you can see in the mesh, that's all I need. 

Previously, I would

1. create a .stl file from EXStar (the software for my scanner)
2. in Solidworks, with the scan 3D add-in enabled, open the .stl as a scan-to-3D item, this would open a new part with a mesh in it
3. Run the mesh prep wizard, this would normally involve deleting some mesh I don't need and reducing the mesh complexity down quite a lot, this would also take quite a long time to run
4. Run the surface wizard to generate surfaces which can then be used in onward modelling

I don't know if something has changed, but now when I try this at step 4, every mesh seems to result in every surface being self intersected and therefore it does nothing, as the only option for a self-intersected surface is to delete it, and as every surface is self intersecting, everything is deleted.

Any help would be welcome, thanks. James Ward