A modeling operation that blends between two or more 2D cross-section profiles placed at different positions to form a smooth transitional solid.
Loft creates a solid by interpolating smoothly between multiple cross-section profiles positioned in 3D space. A two-profile loft transitions from shape A to shape B. Additional guide rails or rail curves can control the path and curvature of the transition. Loft is essential for organic and aerodynamic shapes, wing profiles, boat hulls, ergonomic grips, and consumer product casings, where no single extruded or revolved shape is sufficient.
In 3D printing design, loft creates tapered enclosures, ergonomic handles, and duct shapes that transition from circular to rectangular cross-sections. Fusion 360, SolidWorks, and FreeCAD all support multi-section loft with guide rails. For best print results, orient the loft so the smallest cross-section is at the top to minimize overhangs and support needs.
Profiles must have compatible point counts or the loft will twist. Mismatched profile orientations cause helical twisting of the solid: use the 'align profiles' option in your CAD tool. Lofts between very different shapes (circle to star) can produce unprintable thin features at intermediate sections. Always cross-section the resulting solid at intermediate heights to verify wall thickness throughout.
| Field | 3D design, engineering |
|---|---|
| Also called | lofted solid, skinning |
Engineer, author of The Big Book of 3D Printing and additive manufacturing expert