Basically, instead of just pushing up and down like a regular displacement map, this pushes at an angle. So it's like using a normal map to control the direction of a displacement map, so it can push in/out at an angle, allowing for overlapping.
This image shows it better
Shows it better, as you can see how it's not just pushing geometry up and down, it's doing it in a direction, allowing such overlapping.
Replies
This image shows it better
Shows it better, as you can see how it's not just pushing geometry up and down, it's doing it in a direction, allowing such overlapping.