Steps for Metalness Workflow
Metal materials load much in the same way as our regular materials but with these exceptions:
Use the SPECULAR workflow, not the METALNESS workflow.
Don't invert the reflection (REFL) map, because in the specular workflow this is where the color information is stored.
Under the reflection panel, make sure to disable "Fresnel" otherwise the material will not look metallic.
Here is a visual demonstration for how the materials should be setup in Vray:
If you require any assistance using our materials in SketchUp please contact us at firstname.lastname@example.org.