Flatten Mode

Flatten Mode flattens vertices to a common plane. The flatten plane is set by the first face that is clicked on at the start of a brush stroke.

1. Area is flattened by performing brush strokes starting from a semi-horizontal face at a raised height.
2. Area is flattened by performing brush strokes starting from a sloping face.
3. Area is flattened by performing brush strokes starting from a horizontal face at ground level.

By holding SHIFT as you perform the brush stroke, the flattening wil be constrained to a horizontal plane at the height of the first face that was clicked.

A negative strength value (strength indicator points towards the mesh) will displace the vertices away from the plane of the first face that was clicked on at the start of the stroke. This operation has limited practical use. It tends to produce sharp peaks and deep valleys which could be suitable for sculpting a rocky mountain range