[MENTION=329944]Mr. Boat[/MENTION] There is no easy solution for . If you know, where the edge of the mesh is placed in UVs, you could check if coordinates, that POM node outputs, are exceeding a given value. If yes, write 0 to opacity mask, otherwise write 1. method is probably not flexible enough to be actually usable. If you need silhouette on those edges, consider using tessellation. Otherwise, you could try implementing silhouette POM on your own. You would need geometry shader access for that and it is beyond of what can be done in material editor.