A modeling operation that moves a 2D cross-section profile along a defined 3D path curve to generate a solid or surface.
A sweep takes a 2D profile (the cross-section) and moves it along a 3D path (guide curve), generating a solid by tracing the profile's boundary. Unlike a loft, the cross-section shape remains constant throughout (unless a twist or scaling factor is applied). The path can be any 3D curve: straight, arc, helix, or freeform spline. Sweeps are used for conduit routing, pipe design, handrails, and spring geometries.
For 3D printing: sweep creates cable channels, conduit pathways, ergonomic grip ridges, and helical threads. A circular cross-section swept along a helix path creates a spring or coil geometry. Fusion 360 sweep supports constant and variable cross-sections with twist. Orientation of the sweep path relative to print layers affects strength: paths oriented parallel to Z layers produce the strongest sweep results.
The profile must remain entirely on one side of the path: if the path curves tighter than the profile width, self-intersection occurs and the operation fails. Very long sweep paths with tight bends produce geometry that overhangs unsupported. Always verify the sweep with a cross-section at the sharpest bend point to check for self-intersection or near-zero wall thickness.
| Field | 3D design, engineering |
|---|---|
| Also called | path sweep, swept solid |
Engineer, author of The Big Book of 3D Printing and additive manufacturing expert