Info:
UVPackmaster 2 is an efficient and fully-featured UV packing engine available also as a plugin for 3ds Max. Its robustness comes not only from the fact that it was written in C++ and runs as a multi-threaded application - it also provides a packing algorithm for Cuda-enabled GPUs (what gives a significant boost). In fact, it can perform some packing operations on all devices simultaneously: CPU and all GPUs in the system.

Features
UVPackmaster in 3ds Max is implemented as modifier - in order to pack a UV map the user needs to add the UVP modifier to the object modifier stack, select appropriate packing options (or load the options from a preset file) and press the Pack button. The UVP engine will pack the UV map and render the result to the user in a separate window. After the user closes the window, the modifier will remember the packing result in its own structure and it will apply it the original UV map every time it is instructed by 3ds Max to modify the object. The user can press the Pack button multiple times, changing the options according to their needs. Every time the button is pressed, the previous packing result is discarded and the original UV map is packed once again using a new set of the packing parameters. In order to apply the packed UV map to the object permanently, the user simply needs to collapse the UVP modifier.

The plugin for 3ds Max provides all core features of UVPackmaster engine PRO edition:

efficient UV packing algorithm
UV islands area measurement
overlapping UV islands detection
heuristic search algorithm
packing for a non-square texture
add new UV islands into an existing packing
accurate pixel margin calculation
overlapping UV islands lock
grouping UV islands
UDIM support
advanced heuristic algorithm
packing on GPU
heuristic search on all devices simultaneously (CPU and all GPUs)