If you have ever struggled to create complex, organic, or double-curved surfaces in SketchUp, you have likely heard whispers of a legendary plugin: Curviloft. For years, Curviloft has been the go-to extension for architects, 3D modelers, and woodworkers who need to generate skins, membranes, and solid geometry from simple linework.
But if you are searching for the term "Curviloft RBZ" , you are likely at the very first step of the journey: installation. The .rbz file extension is SketchUp’s native packaging format for Ruby-based extensions. Unlike older .rb files that required manual placement into folders, the RBZ format allows for one-click installation via SketchUp’s Extension Manager.
This article will serve as your complete encyclopedia for everything related to Curviloft RBZ—from finding the legitimate file and installing it, to mastering its three core tools (Loft by Splines, Loft along Path, and Skin Contours).
Even with the correct Curviloft RBZ, users complain that "nothing happens." curviloft rbz
| Problem | Most Likely Cause | Solution | | :--- | :--- | :--- | | "Lines are not connecting" | Your curves have different vertex counts. | Use Weld (right-click > Weld) to make one continuous curve. | | "The face is twisted" | The start points of your profiles are misaligned. | Click the "Fix Orientation" button in the dialog or manually rotate the profiles. | | "SketchUp crashes" | You ran out of memory. Try to create a mesh with 100,000 faces. | Undo. Reduce curve resolution. Use "Simplified" mesh option. | | "Toolbar is greyed out" | No edges are selected. | Select at least two separate loops of edges before clicking the icon. |
Scenario: You have 3 rectangles drawn at different heights and rotated slightly.
Scenario: You want a garden hose bending around a corner. If you have ever struggled to create complex,
To truly master the plugin, combine it with other free extensions.
SketchUp updates (e.g., from 2023 to 2024) often break Ruby plugins.
To preserve your setup:
Note: Mac users find this in ~/Library/Application Support/SketchUp.
The primary home for Curviloft is SketchUcation (the largest SketchUp community forum). The developer, Chris Fullmer, released it as freeware, meaning it is 100% free.
While less common for older plugins, some versions are mirrored on the official SketchUp Extension Warehouse. Search for "Curviloft" directly inside SketchUp (Window > Extension Warehouse). Even with the correct Curviloft RBZ, users complain