Creates an imaginary plane as you move your cursor across the sur- face. The click where you start your stroke determines the height of the plane. Anything within the area of the brush will be pushed toward that plane, flattening the surface. As you move the cursor, the angle of the plane rotates to match the surface but the height relative to the surface will remain the same.
• Lock plane: When this modifier is active, the height and angle will be fixed in the position determined by the beginning of the stroke. This allows you to build up a large surface that is completely flat.
• Angle falloff: Use this when sculpting with the Flatten tool when you’re working near corner in the model’s surface. This modifier prevents the Flatten tool from distort- ing the surface that’s on the other side of the corner.