I have an .OBJ file from 3d scan and able to import in solidworks using geomagic software.But if i open that in an assembly, i unable to see the actual part. I can see only a thin flat square sheet. But if i use "autosurface" in geomagic I able to see the part. But I try to make core & cavity using this part, unable to do the CNC program. Please advise.