What Is Front Faces Only Masking in Blender?

Front Faces Only masking in Blender is a sculpting feature that restricts brush strokes, masking, and paint operations strictly to the surfaces of a mesh that are facing the camera view. By ignoring back-facing geometry and hidden surfaces within the brush's radius, this setting prevents accidental modifications to the opposite side of thin objects or complex overlapping meshes.

How Front Faces Only Works

When sculpting or painting in Blender, standard brushes operate within a spherical volume. This means any geometry falling inside that 3D sphere gets modified, even if it is on the back of the object or hidden behind another layer.

Enabling Front Faces Only changes how Blender calculates brush influence:

  • Normal Orientation: The brush evaluates the direction of surface normals relative to the viewport angle.
  • Angle Limits: Geometry pointing away from the view (typically surfaces angled beyond 90 degrees from the viewport camera) is automatically excluded from the operation.
  • Surface Occlusion: Surfaces hidden directly behind the front-most mesh geometry will not be affected.

Common Use Cases

This feature is essential for several standard sculpting scenarios:

  • Thin Geometry: Sculpting features on thin objects like ears, fingers, eyelids, cloth, or armor plates without ruining the geometry on the reverse side.
  • Tight Creases and Folds: Working inside narrow crevices without affecting adjacent, opposing surfaces.
  • Targeted Masking: Applying paint or sculpt masks precisely to visible areas without bleeding through the mesh.

How to Enable Front Faces Only in Blender

You can turn on Front Faces Only for specific brushes in Sculpt Mode:

  1. Select Sculpt Mode from the mode dropdown menu.
  2. Select your desired sculpting or masking brush (e.g., Draw, Grab, or Mask).
  3. Open the Tool settings panel on the right sidebar (N-panel) or the top tool options bar.
  4. Expand the Advanced drop-down section under the brush settings.
  5. Check the box for Front Faces Only.

Alternatively, you can enable global viewport falloff controls under the Options menu in the top-right corner of the Sculpt Mode viewport by adjusting the Topology or Normal falloff settings depending on your Blender version.