Combine Curviloft 18a with Fredo6 Tools on Surface and Vertex Tools . This trinity of plugins will allow you to model anything from a Formula 1 car to a Gaudí cathedral inside SketchUp.
The term refers to a specific, widely circulated version of this extension. While later updates (such as versions 1.8, 1.8b, and the newer CLF Essencials) exist, the 18a build is renowned among power users for its stability, specific feature set, and compatibility with older SketchUp versions (from 2015 to 2019). It acts as a bridge between basic push-pull modeling and advanced NURBS-like surface generation.
Select all three arcs. Click the Curviloft 18a icon (the rainbow-colored spline). Choose "Loft by Spline."
Introduction: What is Curviloft 18a? In the world of 3D modeling, particularly within the SketchUp ecosystem, few plugins have achieved the legendary status of Curviloft . Developed by the French architect and programmer Christophe L. (known as "ThomThom"), Curviloft has become the gold standard for creating complex organic shapes, rounded geometry, and smooth transitions that native SketchUp tools struggle to produce.
Open SketchUp 2018 or 2019 (optimal compatibility). Draw a 10m x 10m square. Delete the face so you only have the four edges.
