User Guide: Optimize

Lock All/Clear/Swap: Change the locked status of all flattened shells. Locked shells can't be accidentally flattened, cut, welded or edited in any other way; they can only be moved, rotated and scaled. Use the L hotkey to toggle individual shells, or to box select a group of shells.

Run For: Click on Run For to continuously flatten picked shells until they don't change any more, or until the timer runs out. If no shells are picked, all unlocked shells are optimized. You can increase the mins value to give it more minutes on complex meshes.

Map Rez: Change the Map Rez setting so that UVLayout knows the pixel resolution of the map that you will be using with these UVs, and it'll use that to work out when to stop flattening a shell; if the change is less than a pixel, there's no need to optimize further. You can cheat here though, so if you want a less accurate but faster optimize, reduce the Map Rez setting.

Calc Subdivision Targets: When a mesh is loaded as a SUBD surface, UVLayout moves the cage control points down onto the subdivision surface, and its this "knots surface" that you see and edit; under most circumstance this is enough to produce distortion free UVs for SUBD surfaces. There are certain shapes however where this approach doesn't work so well, and so Calc Subdivision Targets can then be used to compute a more accurate approximation of the subdivision surface; it can take a few minutes, so is not applied by default when SUBD surfaces are loaded. Pick the shells you want to apply this too, click the Calc Subdivision Targets button and wait for it to finish processing, then re-optimize. If no shells are picked, all unlocked shells are processed.
[v1.20.4 >>]

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-	; Calc Subdivision Targets : When a mesh is loaded as a SUBD surface, UVLayout moves the cage control points down onto the subdivision surface, and its this "knots surface" that you see and edit; under most circumstance this is enough to produce distortion free UVs for the SUBD surface. There are certain shapes however where this approach doesn't work so well, and so '''Calc Subdivision Targets''' can then be used to compute a more accurate approximation of the subdivision surface; it can take a few minutes, so is not applied by default when SUBD surfaces are loaded. Pick the shells you want to apply this too, click the '''Calc Subdivision Targets''' button wait for it to finish processing, then re-optimize. If no shells are picked, all unlocked shells are processed. {{New:end\|v1.20.4\|User Guide: Hotkeys#v1204}} </div>	+	; Calc Subdivision Targets : When a mesh is loaded as a SUBD surface, UVLayout moves the cage control points down onto the subdivision surface, and its this "knots surface" that you see and edit; under most circumstance this is enough to produce distortion free UVs for SUBD surfaces. There are certain shapes however where this approach doesn't work so well, and so '''Calc Subdivision Targets''' can then be used to compute a more accurate approximation of the subdivision surface; it can take a few minutes, so is not applied by default when SUBD surfaces are loaded. Pick the shells you want to apply this too, click the '''Calc Subdivision Targets''' button and wait for it to finish processing, then re-optimize. If no shells are picked, all unlocked shells are processed. {{New:end\|v1.20.4\|User Guide: Hotkeys#v1204}} </div>