The approach of the islands along a common edge.

The approach of the islands along a common edge, with the possibility of setting the distance between them.

Projecting islands in this way is necessary in order to

1. Draw more conveniently.
2. It is more convenient to perceive UV.
3. When applying textures on UV, so that there are no multidirectional fibers, cracks, etc.

The distance between the islands is needed for normal maps in places of hard edges, so that artifacts do not appear. It turns out something similar to the "Stitch" tool, but so that it works with many islands, not two.