Firstly, the above picture is from Autodesk Navisworks, not Inventor. The part was created in Inventor and then was uppended to Navisworks for plant layout purpose.
The images applied to part surface in Inventor will be gone after the part is uppend to Navisworks. I have not found the better way to make such simple safty fence in Inventor and then display it in Navisworks. Still need help.