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Metamorphic Weight mode
The Current Tool dropdown contains four tools:
Add - Holding the LMB down in this mode will continue adding vertices to a weight map, or increase the strength of existing points within the weight map
Subtract - Has the opposite effect to Add as you might imagine
Blur - (Keyboard Modifier Shift) Blur softens a selection, bringing a gradient to soften a slope between points with not much weight and points with a lot
Clear - Is a soft deletion brush that removes vertices from a weight map.
None of the tools will have any effect if the Weight Map dropdown is not accessed first and either an existing weight map chosen, or a new one created.