Convert Legacy Curve
Turn an old curve shape into its analytic replacement in one click. A Curve becomes an Ngon, a Curve Revolve becomes an Ngon plus a Revolve modifier, and a Curve Tube becomes a sphere swept along the curve with the Sweep modifier. The new shape keeps the old one’s place in the chain. The curve primitives themselves stay available; converting is optional.
How to use
- Select the curve shape.
- In Object Properties → SDF, under the curve settings, click the button for its type:
- Convert to Ngon on a Curve
- Convert to Ngon + Revolve on a Curve Revolve
- Convert to Sweep Chain on a Curve Tube
- Adjust the options in the redo panel if needed.
The operator works on every selected curve shape at once. The converted object ends up selected and active, ready to edit with the Ngon or Sweep gizmo.
What carries over
Everything that made the shape part of your model: its name, its modifier stack, every boolean or emboss that used it as a target, its parenting, and its materials. The curve object itself is deleted unless you tick Keep Original.
Options
- Samples per Segment: polygon points sampled from each Bezier segment when a profile becomes an Ngon (default
8, range2–32). - Max Profile Points: cap on the converted Ngon’s point count (default
96). - Keep Original: keep the curve object, hidden and with Render off, instead of deleting it.
What each type becomes
| Legacy shape | Result |
|---|---|
| Curve | An Ngon in the profile’s plane, with the same depth, rounding and profile. Edit the outline with the Ngon gizmo. |
| Curve Revolve | An Ngon of the profile plus a Revolve modifier around the old axis. Only full 360° revolves with an untilted profile convert; the operator says why otherwise. |
| Curve Tube | A sphere with the tube’s radius, carrying a Sweep whose path is the curve’s waypoints. Every interior corner is pre-rounded to match the original curvature, so the path re-smooths into the tube’s shape. Edit the path with the Sweep gizmo. |
Only the first spline of a multi-spline curve converts; the operator reports how many it skipped.
See also
- Curve-Based Primitives: the three legacy shapes
- Sweep, Revolve, Ngon: what they become