Affect Region Modifier

This modifier lets you translate an area of vertices to form a bubble over the surface of an object.In addition to providing effects similar to the Affect Region function in an Editable Mesh, the affect region modifiier is not dependent on a specific selection of vertices.

The easiest way to see this modifier’s effect is with a shallow, flat box object with plenty of subdivisions.

When you apply the Affect Region modifier, it assigns an arrow-like gizmo consisting of two points connected by a line. The base of the arrow is the start point. The length and direction of the arrow defines the amount of movement of the vertices. Any vertices within Falloff distance of the base of the arrow are translated in the direction of the arrow.

Note that since no points on the mesh are directly selected, this modifier does not depend on the topology of the input object. You can apply it to any renderable object.

Affect Region Modifier applied

Affect Region Modifier on a helix

Reference

Note: The parameters of this modifier are exactly the same as in the Affect Region function of the Edit Mesh modifier.

Sub-Object Seletion

Points: The base and tip of the gizmo arrow are selectable points when in sub-object selection mode. You can select, translate, and animate these two points together or individually.

Affect Region Parameters

Falloff: Use this to set the radius, in units, from the base of the gizmo arrow, of affected vertices. (Spinner Value: float, 0 to 999,999)

Ignore Back Facing: Check this to affect only those vertices whose face normals are in the same genreral direction as the gizmo arrow. When this is unchecked, all vertices in the Falloff area are affected.

Curve Parameters

Pinch: Use this to affect the tangency of the curve where it meets the arrow tip. Positive values produce a pointed tip, while negative values produce a dimple. (Spinner Value: float, -999,999 to 999,999)

Bubble: Use this to change the curvature of the affected vertices. A value of 1.0 produces a half-dome. As you reduce this value, the sides of the dome slope more steeply. Negative values lower the base of the curve below the base of the arrow gizmo. (Spinner Value: float, -999,999 to 999,999)

How To

To form a bubble over the surface of a box, do this:

1. Create a box with 15 height, width and length segments
2. Select affect region in the modify panel.
3. In the parameters area, set the falloff to 50.
4. Adjust the various parameters to achieve different effects.