Rounding
Rounding softens the edges of a single primitive. Every primitive that has hard edges exposes a rounding control in the Object Properties panel.
Parameters
- Rounding: edge radius (
0.0–10.0, soft max2.0, default0.0) - Profile: Round / Sharp / Soft / Tight / Chamfer (see Profiles)
- Chamfer Smooth (when Profile = Chamfer): softens where the chamfer meets the faces (
0.0–5.0, soft max0.5)
Which primitives support rounding
| Primitive | Rounding | Bevel |
|---|---|---|
| Box | ✓ | — |
| Cylinder | ✓ | — |
| Cone | ✓ | — |
| Prism | ✓ | ✓ |
| Trapezoid | ✓ | ✓ |
| Curve | ✓ | — |
| Sphere | : (already smooth) | — |
| Capsule | : (already smooth) | — |
| Torus | : (already smooth) | — |
| Curve Tube | : (swept smooth) | — |
| Curve Revolve | ✓ | — |
| Ngon | per corner | per corner |
Bevel for Prism and Trapezoid
Prism and Trapezoid have an extra Bevel control independent of Rounding. Rounding applies to the top and bottom rims; Bevel applies to the vertical (or slanted) corner edges. Both have their own profile selector and chamfer-smooth control, so you can pair, say, Round on the rims with Sharp on the corners.
Workflow
- Select the primitive.
- Open Object Properties → SDF.
- Drag the Rounding slider, or press
Bover the primitive for a live drag modal. - Pick the profile (Round / Sharp / Soft / Tight / Chamfer): the dropdown or
1–5in the modal. - If you picked Chamfer, push Chamfer Smooth up to soften the bevel-meets-face seam.
Adjust modal (B)
Press B over a primitive to drag its rounding radius live. You can also click the rounding gizmo dot in the viewport to enter the same modal, see Interface: Gizmos.
| Action | Effect |
|---|---|
| LMB-drag | Adjust radius |
| Shift (while dragging) | Precision mode: slow, fine adjustment |
| Ctrl (while dragging) | Snap to round increments |
1 | Round profile |
2 | Sharp profile |
3 | Soft profile |
4 | Tight profile |
5 | Chamfer profile |
S | Toggle radius ↔ Chamfer Smooth (only useful when profile = Chamfer) |
| Enter / Space / LMB-release | Confirm |
| Esc / RMB | Cancel |
The viewport updates in real time, including across booleans and mirrors, so you see the fillet propagate through the entire modifier stack as you drag.
A Smooth modifier on the object rounds every edge to at least its radius, so a shape’s own Rounding only shows where it is the larger of the two.
See also
- Blending: fillets on modifier seams (
Ctrl+Bmodal) - Profiles: all five fillet shapes explained
- Interface: Gizmos: viewport gizmos that open this modal