At this `Work process` I`d like to explain how I created material of corten steel. At the very beginning I was thinking to create nice material with Substance Painter, but it wasn`t a really good decision because in that case I can create one-project-material and I want to make something more multipurpose, material which I can use in future projects.

I found nice corten texture and divide it on few smaller ones to get randomness on my corten panels. So my basic material it`s quite complicated blend material with few levels of dirt and BW masks to looks as realistic as possible, which later I copied few times with different numbers on AO.

I made separate materials for different levels of panels:
1. Wet panels under windows with a different intensity of AO and glossiness.
2. Dry panels from sunny side.
3. Top panels with dirt only on edges.
4. Lower panels with ground dirt.
5. Vertical panels.
6. Material for window frames.