Why are some IGS-Files transparent when opened with autodesk inventor and how can I fix it?
When you import to an assembly, the .Step model is transparent on the part level. Navigate your mouse to the assembly tree, right click your surface and click edit (It should isolate the part for editing). Then again, right click the surface part in the assembly tree. now look for transparency(should be checked). Just un-check transparent. Should make your part(or assembly) solid, then at the top right of inventor click the "return".