Chisel
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Boolean

Combine two SDF objects. Chisel booleans operate directly on the distance fields, so the result is clean and re-editable — no mesh repair, no bad normals, no duplicated geometry.

Boolean settings

Operations

Union

Combine both shapes into a single solid volume.

Boolean Union

Hotkey: Alt + = or NumPad +

Difference

Subtract the target from the active object — the classic “cut out” boolean.

Boolean Difference

Hotkey: Alt + − or NumPad −

Intersect

Keep only the volume where both shapes overlap.

Boolean Intersect

Hotkey: Alt + \\ or NumPad /

Slice

Cut the active object with the target and keep both halves as separate volumes — Slice flips the host to Difference and spawns a {name}_slice copy set to Intersect. Add it from the draw tool, the Add Modifier menu, or the pie. The Boolean modifier’s Operation dropdown itself contains Difference, Union, and Intersect only.

Boolean Slice

Smooth blending

Push the Blend Radius above zero and the boolean seam becomes a smooth fillet — no extra geometry, just math. The fillet shape follows the Blend Profile. In the panel this slider is labelled Outer.

Smooth blend

Setup

  1. Select source objects, then make the destination active.
  2. Add a Boolean modifier (Add Modifier menu, pie menu, or hotkey).
  3. Set the Target to the operand object.
  4. Choose the Operation.
  5. Optionally raise Blend Radius for a smooth transition.

Swap the operation

Swap Modifier (on the RMB context menu and as the Shift+click of the pie modifier buttons) rewrites every modifier that targets the selected shapes to a new operation at once. The cycle hotkeys ; and ' step the active boolean through Difference → Union → Intersect → Emboss → Engrave (Slice excluded).

Parameters

  • Target — the operand object. The field is a native object search box labelled Target; type or pick the operand by name.
  • Operation — Difference / Union / Intersect. (Slice creates two modifiers and isn’t in this dropdown; see Slice above.)
  • Blend Radius (labelled Outer in the panel) — fillet radius at the seam (0.0–10.0, soft max 2.0). 0.0 = sharp boolean.
  • Blend Profile — Round / Sharp / Soft / Tight / Chamfer.
  • Blend Smooth (Chamfer profile only) — softens the chamfer’s outer edges.
  • Material Blend — width multiplier for the color blend across the seam (0.0–10.0, soft max 3.0, default 1.0). 1.0 = color follows geometry; higher = color bleeds wider; 0.0 = color snaps even on smooth seams.

When Blend Radius > 0, Use Smooth is auto-enabled. See Rounding & Blending for the profile shapes.

See also