SLIM UV Unwrapping

[RonanDucluzeau]

@brecht

One is that an operation may be slow, and you want to be able to change settings without having to wait for it to complete each time. For that probably the best solution is to implement a mechanism where if the operation is slow, a progress bar start, but you can still change the settings.

I am not fan of wasting energy for unnecessary computations.

@Dangry

For instance of you do hard surface stuff 95% of the time Angle is enough and Conformal is only need in some very rare cases. When you do organic SLIM is usually the only method needed.

Indeed, unless if he is a newbie, user knows what method he wants before launching unwrap operator.
So, that is not crucial to have Unwrapping method as a redo setting.

That would make more sense to have a different item per method, in Unwrap menu ; the same way as we have different extrusion methods in Extrude menu.
That would probably incite users to create shortcuts, using user preferences for each method.

That way, if a user unwraps using SLIM method ; presence of a weight group, with a specific name like SLIMAI or SAI for SLIM Area Importance (short with no confusion possible), could be automatically detected and used.
(I prefer to use vertex group, because weight paint mode has a custom color gradient and overlays for values. It was thought as a normalized float attribute painting mode. It should evolve as an attribute painting mode.)

The user directly does what he wants. That can not be faster.