Hard surface pattern -- substance designer
100% made in Substance Designer
With reference to Wang Chen's work
https://www.artstation.com/artwork/GXnRrB, it is more advantageous to use SD to make this kind of complex pattern. Similar to the pen tool, you can directly use the points to control the direction, and use the curve tool to control the thickness change and excessive shading.
Flood Fill node was used to detect the closed area and generate the pattern
