---
title: Modifiers
order: 4
---

Modifiers compose primitives into complete shapes. Boolean, mirror, array, twist — every one of them runs on the SDF directly, so the result is always a single, watertight surface. No mesh repair, no double-sided faces, no booleans that fall apart at zoom.

## Where modifiers live

Open the Chisel section of the *Object Properties* panel and use the toolbar at the top of the modifier list to add, reorder, and remove modifiers. The pie menu (`Q`) also exposes the most common operations: boolean Difference / Union / Intersect, mirror, and quick adjustments.

Each modifier collapses into a header showing its name and active state. Click the chevron to expand its options. New modifiers expand by default — toggle that in the [addon preferences](../preferences.md) if you'd rather they stay collapsed.

## Categories

- **[Boolean](boolean.md)** — Difference, Union, Intersect, Slice. With smooth blending.
- **[Mirror](mirror.md)** — Reflect across one or more axes with optional smooth seam.
- **[Array](array.md)** — Linear and circular repetition.
- **[Solidify](solidify.md)** — Hollow into a shell of given thickness.
- **[Emboss & Engrave](emboss-engrave.md)** — Push a target shape outward (Emboss) or inward (Engrave).
- **[Twist & Bend](twist-bend.md)** — Deform along an axis.

## Modifier UI tips

- **Toolbar buttons** add, remove, and reorder without leaving the panel.
- **Header chevron** expands or collapses each modifier's options. New modifiers expand by default — change in [Preferences](../preferences.md).
- **Quick boolean hotkeys** (`Alt + NumPad −/+/⁄`) bypass the panel entirely: select operands, make destination active, tap the key.
- **Adjust modal** — `B` opens *Adjust Rounding* on a primitive; `Ctrl+B` opens it on the active boolean modifier. While active, keys `1–5` switch profiles instantly: `1` Round, `2` Sharp, `3` Soft, `4` Tight, `5` Chamfer; `S` toggles between the radius and the Chamfer Smooth value.