Chisel
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Curve-Based Primitives

Three primitives that source their geometry from a Blender curve object. Edit the curve in normal Edit Mode and the SDF re-evaluates live in the viewport.

Curve

Extrude a 2D curve along the Z axis to create a swept solid. If no curve is selected when you create one, Chisel auto-generates a Bezier circle.

Curve depth

  • Source curve — any 2D Blender curve object (assigned via the dropdown)
  • Curve Depth — extrusion length (default 1.0, soft max 100.0)
  • Rounding + Profile — applies to the top and bottom edges

Use Curve for letterforms, logos, custom flat shapes, or any swept profile that doesn’t need rounding along the path.

Curve Tube

Sweep a circular cross-section along a 3D Bezier path. The result is perfectly smooth all the way down the path — no faceting, no LOD.

Curve Tube

  • Source curve — any 3D Bezier curve
  • Tube Radius — global radius (default 0.2, soft max 5.0)
  • Per-point radius — adjust radius per control point with Alt + S in curve Edit Mode

No rounding parameter — the swept surface is already smooth all the way along the path.

Curve Tube excels at piping, cables, ropes, hairs, vines, and any flow that benefits from smooth taper.

Curve Revolve

Revolve a 2D profile around the local Y axis. Perfect for vases, bottles, and turned hardware.

Curve Revolve

  • Source curve — a 2D profile curve
  • Revolve Angle — sweep angle in radians (default 2π for a full revolution; range ~1°–360°)
  • Rounding + Profile — applies along the profile edges

The profile is clamped so it cannot cross the axis (no negative-radius artifacts). Drop the angle below 2π to get a partial sweep — handy for pie-slice cutouts or one-off architectural details.

Editing the source curve

Each curve-based primitive references an external curve object. To edit it:

  1. Select the curve object (it lives in the same collection as the SDF object).
  2. Tab into Edit Mode.
  3. Move points, change handle types, or adjust per-point radius (Tube only) with Alt + S.
  4. The SDF refreshes as you go.

Hide the source curve in the outliner if you don’t want it cluttering the viewport — Chisel still finds it.

See also