I created the rough texture using the Wings3D shaders. Then, I used the Gimp to create the base of bump map, added the grip's pattern and this way I created the normal map which gives this slight deformed surface we see in some lens filter.
![[Image: Filter-frame-shader-to-texture.png]](https://i.postimg.cc/y6Pv31MV/Filter-frame-shader-to-texture.png)
Here is a closeup of the final result (basecolor+rough+normal):
![[Image: Filter-frame-shader-to-texture.png]](https://i.postimg.cc/y6Pv31MV/Filter-frame-shader-to-texture.png)
Here is a closeup of the final result (basecolor+rough+normal):
![[Image: Lens-Filter-textured-pbr.png]](https://i.postimg.cc/prqZwCf9/Lens-Filter-textured-pbr.png)