by Clonephaze·Workflow
Images © Clonephaze. Used for product review; image policy.
A focused paint-masking add-on for Blender 4.2 LTS and newer, released under the GNU GPL v3.0 or later.
Auto Paint Boundaries handles face selection for painting in Blender across Texture Paint, Vertex Paint, and Weight Paint. On click, it finds the face under your cursor, expands to a connected region using your active boundary rules, enables Face Masking automatically, and passes the stroke through to your normal brush. There is no manual face selection and no replacement tools.
Boundary rules can be enabled individually or combined, for example Sharp Edges plus UV Seams. Available rules cover Topology, Single Face, Mesh Island, Face Set, Surface Normal Angle with an adjustable threshold, and Edge Attributes including Sharp Edges, UV Seams, Crease Edges, and Bevel Weight. Single Face always limits the result to exactly one polygon. You can toggle boundaries and pin masks directly from the tool header.
Pin Mask Area keeps the mask between strokes instead of clearing it, with Shift+Click to add, Ctrl+Click to subtract, and Ctrl+Shift+Click to replace. Face selections can be saved as named presets on the object and reloaded later with one click. Shortcuts and startup defaults are configured in the add-on preferences.
Auto Paint Boundaries is best for blender artists painting textures, vertex colors, or weights who want strokes limited to clean, connected face regions.
Auto Paint Boundaries is completely free to download and use.
Auto Paint Boundaries is compatible with Blender 4.2 LTS and newer, so it runs on 4.2 and later releases. It integrates with Blender's paint modes, supporting Texture Paint, Vertex Paint, and Weight Paint. Toggles for boundaries and pin masks appear in the tool header, and you can configure shortcuts and startup defaults through the add-on preferences. For the newest release details, check the developer's page and version history.
Auto Paint Boundaries supports Texture Paint, Vertex Paint, and Weight Paint in Blender. In all three, clicking a face finds the polygon under your cursor, expands to a connected region using your active boundary rules, enables Face Masking automatically, and passes the stroke through to your normal brush. There is no manual face selection and no replacement tools, so your existing brushes handle the actual painting within the masked area.
Auto Paint Boundaries lets you enable the boundaries you need and combine them, for example Sharp Edges plus UV Seams. Available rules include Topology, Single Face, Mesh Island, Face Set, and Surface Normal Angle with an adjustable threshold, along with Edge Attributes such as Sharp Edges, UV Seams, Crease Edges, and Bevel Weight. Single Face always limits the result to exactly one polygon. The selected region is what the tool masks before handing the stroke to your brush.
Auto Paint Boundaries can be added to Blender by dragging and dropping the add-on into Blender, or by downloading it and using Install from Disk. Once installed, open the add-on preferences under Edit → Preferences → Extensions → Auto Paint Boundaries to assign custom keybinds for toggling boundaries, toggling pin mask area, and clearing the selection, and to choose which settings apply automatically when opening a new file.
Auto Paint Boundaries is listed as free here and is distributed under the GNU General Public License v3.0 or later. The developer, Clonephaze, also offers a way to support continued development. For current licensing terms and any updates, refer to the developer's page. The extension does not require special permissions in Blender, and issues can be reported through the developer's GitHub repository.
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