The add-on is available in two versions: basic and extended. The functionalities provided by the two versions are depicted are listed below:

efficient packing algorithm: basic and extended

multi-threading support: basic and extended

measure area of selected islands: basic and extended

check for overlapping islands: basic and extended

rotate islands to achieve better packing: extended only

heuristic search algorithm: extended only

pack for a non-squared texture: extended only

pack new islands into an existing packing: extended only

The basic version is available for free. You still can make a donation when downloading the basic version in order to reward our work, but we generally recommend buying the extended version.

Why is the extended version worth buying:

first of all, by buying the extended version you support our work and motivate us to develop this project further,

you can achieve much better packing when rotations are considered (note the presentation video shown above was recorded using the extended version),

when new features are implemented the add-on price may increase, but in order to get the update you will only have to pay the difference between the new price and the amount you have already paid

New functionalities planned to be implemented include:

packing additional islands to those already packed (DONE in version 1.2)

grouping islands by material.

Packing Options

Iterations: number describing how exact the algorithm will be when searching for island placement.

Margin: margin to apply during packing.

Rotation Enable: allow packer to rotate islands in order to achieve better result.

Pre-rotation Disable: disable the initial rotation of islands before generating other orientations. The pre-rotation operation usually optimizes packing, use this option only if you have a good reason

Rotation Step: rotation step in degrees to apply during packing.

Automatic Overlap Check: automatically check for overlapping islands after packing is done.

Heuristic Search Time: the time in seconds the add-on will spend searching the optimal packing solution using the heuristic algorithm. Value ‘0’ means the feature is disabled. This feature is most useful when a single packing pass doesn’t take much time (a few seconds). Use it with a limited number of islands and with limited island orientations considered (‘Rotation Resolution’ == 1). The current heuristic algorithm is most efficient for packing UV maps containing limited number of big islands of irregular shape.

Use Texture Ratio: take into consideration the ratio of the active texture dimensions during packing.

Pack To Others: add selected islands into those already packed in the unit UV square (no scaling will be applied).

You can learn more about the tool here.