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 + NumPad +

Difference

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

Boolean Difference

Hotkey: Alt + NumPad −

Intersect

Keep only the volume where both shapes overlap.

Boolean Intersect

Hotkey: Alt + NumPad /

Slice (tool-level)

Cut the active object with the target and keep both halves as separate volumes. Slice is only available from the draw tool — the Boolean modifier’s Operation dropdown 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.

Smooth blend

Setup

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

Parameters

  • Target — the other Chisel object used as the operand.
  • Operation — Difference / Union / Intersect. (Slice is a tool-level operation that creates two modifiers; see Slice above.)
  • Blend Radius — 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, 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