Curviloft is an essential extension for SketchUp, developed by Fredo6, that specializes in generating complex surfaces and organic shapes from contours. While "Curviloft 18" often refers to its compatibility with SketchUp 2018 or specific maintenance releases like version 1.8a, it remains a top-tier tool for architectural and organic modeling. Key Features & Tools
The extension is divided into three primary tools that handle different geometric challenges:
Loft by Spline: Creates a smooth surface across a series of separate contours or frames. It automatically generates intermediate edges to "skin" the space between lines.
Loft Along Path: Functions similarly to SketchUp’s "Follow Me" tool but with significantly more control. It allows you to loft shapes along a rail, supporting multiple intermediate profiles to vary the shape (e.g., transition from a square to a circle).
Skinning (Skin Contours): Generates a mesh over a closed or open frame of edges. This is highly effective for creating tensile structures, terrain, or complex architectural skins. Ease of Use & Workflow
Curviloft is a powerful geometry-generation plugin for SketchUp, developed by the prolific developer Fredo6. Often referred to as "the lofting powerhouse," it is designed to bridge the gap between SketchUp’s native linear tools and the complex, organic shapes required in modern architecture and industrial design.
At its core, Curviloft automates the creation of curvilinear surfaces based on a set of selected contours. It functions through three primary modes: Loft by Splines, which connects separate open or closed profiles; Loft along Path, which follows a specific trajectory; and Skinning, which fills in a mesh framework of interconnected lines. This flexibility allows designers to create everything from flowing fabric structures and ergonomic furniture to complex rooflines that would be nearly impossible to model manually.
What sets Curviloft apart is its interactive interface. Before finalizing a shape, users can preview the geometry, adjust the "interpolation" (smoothness), and tweak the alignment of vertices. This non-destructive workflow allows for rapid iteration. While SketchUp is often criticized for its inability to handle high-poly organic forms, Curviloft empowers users to produce professional-grade parametric-style results within a lightweight environment.
is a powerful geometry-generation extension for , developed by Fredo6. It is specifically designed to create complex, organic surfaces from contours, which is a process known as lofting and skinning. SketchUcation Key Features and Capabilities
Curviloft typically provides three main tools for generating 3D surfaces: Loft by Spline
: Connects separate contours (profiles) to form a smooth surface along their path. Loft along Path
: Generates a surface by following a specific guide path or rail.
: Creates a surface or "skin" that covers a mesh or wireframe formed by intersecting lines. Technical Requirements
To run Curviloft properly, you must have the following installed: SketchUp Version : Compatible with SU2017 and newer versions.
: This is a shared library required for all Fredo6 plugins. You must have v14.3b or later installed. Sketchucation ExtensionStore : Recommended version v4.4.0 or above for license management. SketchUcation Licensing and Availability Curviloft is hosted on SketchUcation and currently operates under a paid licensing model: SketchUcation Perpetual License : Approximately for 3 seats. Fredo6Bundle2022 : Available for
, which includes 8 essential plugins (like RoundCorner and JointPushPull). SketchUcation Practical Applications Organic Modeling : Ideal for creating fluid shapes like flying roofs , landscape topography, or furniture. Grid Creation : Can be used alongside extensions like Multiple Offset to create structural grids, such as waffle slab ceilings Alternative to Sandbox
: Offers more flexibility and control over segment count and geometry variation compared to SketchUp's native Sandbox tools. troubleshooting a "trial expired" message? EASY GRIDS in SKETCHUP with Curviloft and Multiple Offset
Curviloft is a powerful organic modeling extension for SketchUp, developed by the prolific plugin creator Fredo6 . It is widely considered an essential tool for architects and 3D designers who need to create complex, curved skins and surfaces that SketchUp’s native tools cannot easily handle . curviloft 18
While the "1.8" specifically refers to Curviloft v1.8a, a maintenance release from October 2018, the extension has since evolved to version 2.0a to ensure compatibility with modern SketchUp versions . Core Functionality
Curviloft operates by generating surfaces (skins) from existing contours and edges. It is divided into three primary methods, each accessible through a dedicated toolbar :
Loft by Spline: Joins separate, non-intersecting contours (open or closed) using smooth splines. For example, you can transition a hexagon into a circle by selecting both shapes and letting the tool bridge the gap with a smooth mesh .
Loft along Path: Connects contours along a specified rail curve. This is ideal for modeling objects like curvy chair legs, twisted structural beams, or ship hulls .
Skinning: Generates a surface bounded by three or four contiguous contours. This tool is often used to "patch" holes in complex geometry or create fabric-like surfaces, such as tied curtains or cushions . Key Technical Requirements
To use Curviloft effectively, users must install supporting libraries and manage licensing:
Curviloft is a premier extension for SketchUp, developed by the prolific Fredo6, designed to bridge the gap between simple push-pull modeling and complex organic shapes. While the specific "Curviloft 18" naming likely refers to a maintenance release (like v1.8a) or a version compatible with SketchUp 2018, the core functionality remains the essential toolset for generating smooth surfaces from contours. Mastering the Curviloft Toolkit
Curviloft consists of three main operations that handle different geometric challenges:
Loft by Spline: Connects separate open or closed contours using smooth splines. This is ideal for joining different shapes—like a circle to a square—to create a fluid transition.
Loft along Path: Follows a rail curve to join profiles. This tool offers generation methods like Stretch, Offset, and Sweep, which are particularly useful for models requiring consistent thickness or complex winding paths.
Skinning: Creates surfaces bounded by 3 or 4 contiguous contours. It is the go-to choice for filling in the "skin" of an organic framework. Key Features for Precision Modeling Curviloft - SketchUcation
Curviloft is a specialized script for SketchUp, developed by the prominent extension creator Fredo6, specifically designed for Loft and Skinning operations. It is a cornerstone tool for organic 3D modeling, allowing users to generate complex, smooth surfaces from contour lines and curves that would be difficult to create manually. Core Functionality
Curviloft typically provides three primary tools to generate 3D geometry from a selection of curves or points:
Loft by Spline: Joins separate open or closed contours to create a continuous surface "bridge".
Loft Along Path: Follows a specific "rail" curve to extrude profiles, essentially creating complex, swept shapes or custom pipes.
Skinning (Skin Contours): Creates a surface (a "skin") based on a closed set of boundary curves, filling the area with smooth geometry. Technical Requirements & Installation
To run Curviloft, several dependencies must be installed on your SketchUp system: Curviloft is an essential extension for SketchUp, developed
LibFredo6: This is a shared library required for all Fredo6 extensions to function.
Sketchucation ExtensionStore: While not always strictly required for operation, it is the primary platform for downloading and managing updates for the plugin.
Cost: While historically free, many Fredo6 plugins have moved to a licensed "Freemium" or paid model on the SketchUcation PluginStore to support ongoing development. Usage Tips
Clean Geometry: Ensure there are no "gaps" in your contours; small breaks in the lines can cause the script to fail or create "deleted vertex" errors.
Path Precision: For the "Loft Along Path" tool, the path should ideally be a single continuous curve (use tools like Curvizard to weld segments if necessary).
Previews: Curviloft generates a temporary preview grid, allowing you to adjust parameters like segment density and vertex matching before finalizing the geometry. Curviloft - SketchUcation
Product Report: Curviloft 1.8 (SketchUp Extension) Curviloft is a powerful surface modeling extension for SketchUp, developed by Fredo6, specifically designed for "Loft and Skinning". It allows users to generate complex organic surfaces from simple contour lines or frames. Version 1.8 (often referred to as Curviloft v1.8a) marked a significant point in the extension's development, transitioning from a free beta tool to a licensed product. 1. Key Tools and Features
Curviloft consists of three primary tools that facilitate advanced organic modeling:
Loft by Spline: Joins separate contours (open or closed) using smooth splines. It draws intermediate edges between your lines to create a face.
Loft Along Path: Similar to SketchUp's native "Follow Me" tool but more advanced. It allows you to loft a shape along a rail while transitioning between different shapes (e.g., a square becoming a circle).
Skin Contours: Creates a surface or "skin" bounded by 3 or 4 contiguous contours. This is widely used for creating tensile structures, roofs, or complex architectural exteriors. 2. Technical Requirements
To run Curviloft successfully, the following dependencies must be installed on your system:
LibFredo6: This is a shared library required for all Fredo6 plugins. Current versions typically require LibFredo6 v14.3b or above.
Sketchucation ExtensionStore: This is needed for license management and updates, specifically v4.4.0 or above.
Compatibility: Supports SketchUp versions from SU2017 to current, running on both Windows and Mac OSX. 3. Licensing and Pricing
While earlier versions were free, Curviloft is now a paid extension licensed through Sketchucation.
Free Trial: A 30-day full-feature trial period is available starting from the first usage. CurviLoft 18 vs
Perpetual License: A one-time purchase of $15.00 covers a perpetual license for up to 3 seats.
Bundle Option: Users can also purchase the Fredo6Bundle (which includes 8 popular plugins like JointPushPull and RoundCorner) for $50.00. 4. Installation Steps Register for a free account at SketchUcation. Install the Sketchucation ExtensionStore plugin. Install LibFredo6 (critical prerequisite).
Download the Curviloft RBZ file and install it via the SketchUp Extension Manager. Restart SketchUp to ensure all components load properly. Curviloft
Unlocking Organic Forms: A Guide to SketchUp’s Curviloft Mastering organic geometry in SketchUp often feels like a hurdle, but the extension by
is the industry-standard solution for bridging that gap. Whether you are using the classic Curviloft v1.8a maintenance release or the latest
, this tool is essential for creating smooth, complex skins from simple contours. Why Every Modeler Needs Curviloft
Standard SketchUp tools like "Follow Me" are great for uniform extrusions, but they fail when a shape needs to transition—for example, turning a square base into a circular top.
solves this by generating surfaces through three primary methods: Loft by Spline
: Joins separate open or closed contours using smooth splines. Loft along Path
: Similar to "Follow Me," but allows you to add intermediate shapes, letting a profile change as it travels along a rail.
: Creates a surface bounded by 3 or 4 contiguous contours, perfect for complex architectural roofs or tensile structures. Getting Started: Installation Requirements , you must first install the shared library (v14.3b or above for newer versions). Download the SketchUcation ExtensionStore Install it via SketchUp's Extension Manager Restart SketchUp to ensure the plugin loads correctly. Free vs. Paid: What You Need to Know While older versions like were widely known as free, most extensions transitioned to a paid model in early 2022. Trial Period : You can download the latest version for a 30-day full-featured free trial : After the trial, a perpetual license for costs approximately for up to three seats at SketchUcation Bundle Options : If you use multiple Fredo6 tools, the Fredo6Bundle (including 8 plugins) is available for Pro Tip for Complex Meshes When generating a surface, use the Preview Mode
to adjust vertex matching. If the mesh looks "twisted," you can manually drag vertices to align them, ensuring a clean, symmetrical final geometry. For more in-depth workflows, expert reviewers at The SketchUp Essentials and tutorials on SketchUcation offer comprehensive guides for architectural modeling. 31 Mar 2024 —
Introducing Curviloft 18: Revolutionizing Design with Unparalleled Curve Mastery
Curviloft 18 is the latest iteration of a cutting-edge software solution designed for professionals and enthusiasts alike who seek to push the boundaries of curve and surface design. Developed with a keen eye on precision, functionality, and user experience, Curviloft 18 stands as a beacon of innovation in the realm of digital design, offering tools that are both intuitive and powerful.
As of 2025, Fredo6 has hinted that CurviLoft 18 might be the last major numbered version before merging his tools into a unified "Fredo6 Suite." However, version 18 is being hailed as the "Gold Standard" – stable enough for professional production work.
With the rise of AI geometry generation, CurviLoft remains relevant because it gives you manual control. You tell the curve where to go; the AI does not guess.
| Feature | Native SketchUp | CurviLoft 18 | | :--- | :--- | :--- | | Dome from curves | Impossible (needs multiple arcs) | 1 click | | Surface quality | Flat polygons (facets) | Smooth, triangulated mesh | | Twisting forms | Follow Me fails on twists | Handles 360-degree twists | | Editability | Destroy original geometry | Non-destructive relative to curves in group | | File size | Large for complex curves | Efficient quad-based compression |
Use when you have 2+ profile curves.