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Blender Add-ons

Isolate Weight

Blender 4.2+ Paint Tool

Overview

Isolate Weight sets the active vertex group (bone) weight to 1 and all other deform bone weights to 0 on selected Weight Paint vertices. Locked vertex groups are preserved and the remainder (1 - locked_sum) is assigned to the active bone.

UI Location

  • 3D Viewport > Weight Paint > Sidebar (N key) under the Edit tab (Weight Utility).

Features & Usage

  1. Ensure the mesh has an Armature Modifier (or an Armature parent).
  2. Switch to Weight Paint and make the target vertex group active.
  3. Run Isolate Weight from the Sidebar.
    • If vertex selection is off, the first click turns it on and stops. Select vertices, then run again.
  4. With vertices selected, run again to isolate the active bone to 1.

Left unchanged

  • Weights on unselected vertices
  • Locked vertex groups (preserved; remainder goes to active)
  • Non-bone deform vertex groups
  • Hidden vertices

Errors

  • No Armature found
  • No deform bone vertex groups
  • No active bone selected / not found / not a deform bone / locked