I see an error when trying to activate the Blender add-on
Restart Blender once – it should fix the problem. Blender restart might be also needed after upgrading to a newer add-on version.
I activated the add-on but I cannot find the UVP interface in Blender
Keep in mind that the add-on UI is present in the N panel of the UV editor in Blender (not in the 3D Viewport).
The UVPackmaster add-on initializes properly, but packing functionalities are not working (the UVP engine is not initialized)
If you have antivirus software installed, check whether it is not blocking the packer binary from being run. (Some antivirus software is picky about an executable being called from a Python script, as it is the case with UVPackmaster – it is a false positive alert). If you are on Windows, make sure you have Visual Studio Redistributable 2017 from Microsoft installed – it is required for the engine to run.
I don’t see my GPU in the packing device list
Note the packer supports CUDA-enabled GPUs with compute capability 3.0 and higher. If you have such card and still don’t see it in the packing device list, then installation of the latest GPU driver should solve the problem.
I am receiving a "Faces with inconsistent values found" error
For some packer operations the user may specify parameters on a per-island basis (e.g. group number, per-island rotation step, lock group number etc.). The problem is such that Blender does not internally maintain information about UV islands. That is why the user needs to specify aforementioned parameters on a per-UV face basis in the Blender UI. And during an operation the packer uses those per-face values to determine values assigned to UV islands.
An Faces with inconsistent values error is returned by the packer every time the user assigns different parameter values to two faces belonging to a single UV island – in such a situation the packer cannot determine the parameter value for the island itself in a unambiguous way. After returning an error, the packer will also select all problematic islands, so parameter assignment may be easily fixed by the user.
In order to fix this error, the user has to select every problematic island one by one, and assign a single parameter value to all faces in every island.
For example, if the packer returns an error like in the picture above, it means that at least two faces in the given islands have a different Rotation Step values assigned.