Auke Huys writes:
Maybe you know IPackThat or similiar programs and extensions for other 3d packages - these programs helps you to pack your UV Islands to a compact mass. Usally we do this in Blender by hand, but this is a huge load of work and for the most of us, it isnt fun.
Features and requirements:
- Includes parameters to set iteration count and island margin.
- Currently only works on meshes with no ngons or corrupted data. Doesn't support overlapping UV.
- If the mesh has double vertices the algorithm has unexpected behavior. It's best to remove doubles before running packing.
Addon is developed for Blender version 2.78 and later, with Python 3.5 (builtin).
The developer was so kind to share four copies of his addon with you for free - in case you are fast enough. Please follow this link.
Note: I am not related to the developer. I am not the developer. I am just a supporter.