---
title: Blending
order: 2
---

A blend is the fillet where two things meet: a join's seam, a Bisect cut, a Mirror seam, the joins of Array copies. It is set on the modifier, and on most modifiers it uses one of the five [profiles](profiles.md).

![The sphere, a Union cutter, selected; the blue Blend arc dragged outward: the seam fillets](../assets/gizmo-blending.webp)

## Where blends live

| Modifier | Settings | Radius | Profile | In the viewport |
|---|---|---|---|---|
| [Boolean](../joins/boolean.md) | **Blend**, **Profile**, **Outer**, **Smooth**, **Material Blend** | `0` and up (soft max `2`) | yes | `Ctrl + B`, the blue arc, on a selected [cutter](../getting-started/concepts.md#cutter) |
| [Carve](../joins/carve.md) | **Blend**, **Profile**, **Outer**, **Smooth** | `0` and up (soft max `2`) | yes | `Ctrl + B`, the blue arc, on a selected carve [target](../getting-started/concepts.md#target) |
| [Emboss & Engrave](../joins/emboss-engrave.md) | **Profile**, **Outer**, **Smooth**; **Inner Profile**, **Inner**, **Inner Smooth** | `0` and up (soft max `2`) | yes, per edge | `Ctrl + B` (Outer), the yellow or violet arcs, on a selected stamp |
| [Bisect](../modifiers/bisect.md) | **Blend**, **Profile**, **Outer**, **Smooth**; per polyline corner **Corner Blend**, **Profile**, **Smooth** | `0` and up (soft max `2`) | yes | the orange blend dot and corner dots |
| [Mirror](../modifiers/mirror.md) | **Blend** | `0` and up (soft max `0.5`) | Round only | none |
| [Array](../modifiers/array.md) | **Smooth** | `0` and up (soft max `0.5`) | Round only | the orange smooth dot |
| [Smooth](../modifiers/smooth.md) | **Radius**, **Profile**, **Smooth**, **Override All** | `0` and up (soft max `2`), default `0.02` | yes | none |

With the host active, each of these modifiers has a row in the pie's East wedge. Clicking the blend value on a row drags the blend of that one modifier.

## Blend checkbox

A Boolean, Carve or Bisect only blends while its **Blend** box is ticked; the **Profile**, **Outer** and **Smooth** rows appear when it is. Dragging the radius above `0` ticks the box automatically. An Emboss or Engrave has no **Blend** box: its **Outer** and **Inner** radii always apply.

## Adjust modal (`Ctrl + B`)

With the Chisel tool active, `Ctrl + B` changes the blend of every modifier that uses a selected shape: the Booleans and Carves whose target it is, and the **Outer** edge of the Emboss and Engrave modifiers it stamps. Select the cutter, carve target or stamp; with only a [host](../getting-started/concepts.md#host) selected, `Ctrl + B` does nothing. Moving the mouse away from the active shape widens the blend. The current value is shown next to the cursor.

| Key | What it does |
|---|---|
| `Shift` (held) | Precision: a tenth of the speed |
| `Ctrl` (held) | Snap to `0.1`; with `Shift`, to `0.01` |
| `1` – `5` | Profile: Round, Sharp, Soft, Tight, Chamfer (numpad too) |
| `S` | On a Chamfer: drag its **Smooth** instead; `S` again goes back |
| Click, `Enter`, `Space` | Confirm |
| `Esc`, right-click | Cancel |

Dragging the blue **Blend** arc, at the bottom right of the selection, does the same.

## Material Blend

A Boolean's **Material Blend** sets how wide the colour change across its seam is, without changing the shape. At `1` the colour change follows the fillet, higher values spread it wider, and `0` gives a sharp colour line. A material's own **Blend** setting ([Matcap Shader](../materials/node-editor.md)) can also widen it; the wider of the two is used.

## Smooth modifier

A [Smooth](../modifiers/smooth.md) modifier gives every seam, rounding and bevel of its shape at least its **Radius**. Anything with a smaller radius is raised to it and takes the Smooth's **Profile**; anything larger keeps its own radius and profile. With **Override All** on, every one of them takes the Smooth's radius and profile. Mirror seams and Array joins take only the radius and stay round.

## Limits and known issues

> [!warning] Cancelling keeps the profile
> `Esc` restores the radii, but a profile picked with `1`–`5` during the drag stays. Confirm and press `Ctrl + Z` to undo all of it.

## See also

- [Rounding](rounding.md), [Profiles](profiles.md)
- [Gizmos](../interface/gizmos.md#adjust-arcs): the adjust arcs