Plugin Sketchup — Curviloft
Summary: Curviloft turns SketchUp into a surface-modeling powerhouse. Master the three core tools (Loft by Spline, Loft along Path, Skinning) and you can create anything from organic furniture to architectural shells.
Would you like a specific example (e.g., making a spiral staircase surface or a terrain mesh)?
Master Complex Geometry: A Deep Dive into the Curviloft Plugin for SketchUp
If you’ve spent any significant time in SketchUp, you’ve likely hit the "wall." You know the one—where you need to create a smooth, organic shape, a flowing fabric, or a complex curved transition, and the native tools just won't cooperate. SketchUp is fantastic for rectilinear architecture, but organic modeling can feel like pulling teeth.
Enter Curviloft. Developed by the legendary Fredo6, Curviloft is widely considered a "must-have" extension for anyone serious about 3D modeling. It transforms SketchUp from a box-modeling tool into a powerhouse capable of generating complex surfaces from contours.
In this guide, we’ll explore what Curviloft is, its core features, and how you can use it to level up your workflow. What is Curviloft?
Curviloft is a dedicated SketchUp extension designed for Lofting and Skinning. In simple terms, it takes a set of lines or curves and "stretches" a surface across them.
Think of it like building a boat: you set up the wooden ribs (your curves), and Curviloft provides the planks (the geometry) to cover them. It automates the creation of faces that would otherwise take hours of manual stitching. The Three Core Tools of Curviloft
Curviloft is conveniently divided into three main functions, accessible via its floating toolbar: 1. Loft by Spline
This is the most common use case. You select a series of open or closed curves in space, and Curviloft connects them sequentially.
Best for: Creating organic furniture legs, vases, or complex ductwork.
Pro Tip: The order in which you select your curves matters, as it dictates the path of the generated geometry. 2. Loft Along Path
This tool is similar to SketchUp's native "Follow Me" tool but on steroids. It allows you to sweep a profile along a path while maintaining control over the scale and rotation of the profile as it moves.
Best for: Winding staircases, handrails, or custom moldings that change shape as they travel. 3. Skinning (Skin Contours)
Skinning allows you to select a closed loop of edges (even if they are on different planes) and fill them with a smooth mesh.
Best for: Landscape topography, tensile fabric structures, or filling gaps in complex organic models. Why Use Curviloft Instead of Native Tools?
You might wonder, "Can't I just use the Sandbox tool?" While the Sandbox tool is great for terrain, Curviloft offers precision and flexibility that native tools lack:
UV Mapping: Curviloft generates clean, quad-based geometry, which makes applying textures (UV mapping) much easier than dealing with the messy triangulation of the Sandbox tool.
Real-time Preview: Before committing to the geometry, Curviloft shows you a "ghost" mesh. You can adjust the number of segments, interpolation, and smoothness on the fly.
Vertex Matching: It intelligently aligns the vertices of different curves to prevent twisting, a common headache in 3D modeling. How to Install Curviloft
Curviloft is a third-party plugin hosted on SketchUcation. To get it running, follow these steps:
Install LibFredo6: This is a shared library required for all of Fredo6’s plugins. Without it, Curviloft won't work.
Download Curviloft: Get the RBZ file from the SketchUcation Plugin Store.
Install via Extension Manager: In SketchUp, go to Extensions > Extension Manager > Install Extension and select your files.
License: As of recent updates, Fredo6 plugins have moved to a very affordable "pay-what-you-want" or small flat-fee model for a perpetual license. It is well worth the investment for the time saved. Tips for Better Results curviloft plugin sketchup
To get the cleanest geometry out of Curviloft, keep these rules in mind:
Keep Segment Counts Consistent: If your first curve has 20 segments and your second has 100, the resulting mesh will look pinched. Use Fredo’s Curvizard tool to equalize segment counts before lofting.
Check Face Orientation: Ensure your curves aren't "inverted" relative to each other, or you’ll end up with a twisted "hourglass" effect.
Use Quads: Whenever possible, choose the "Generate Quads" option. This makes your model compatible with subdivision plugins like SubD. Final Thoughts
The Curviloft plugin is a bridge between SketchUp's simplicity and the power of high-end NURBS modelers like Rhino. Whether you are an architect designing a parametric facade or a hobbyist 3D printing a custom figurine, Curviloft provides the "skin" to your creative "bones."
Ready to start modeling? Download Curviloft today and stop fighting with SketchUp's edges.
Create a sleek chair shell: trace two offset profile curves (seat and back), use Loft by Spline, refine with smoothing and close edges to form a solid.
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is an essential organic modeling extension for developed by Fredo6. It bridges the gap between SketchUp's native tools and complex surface modeling by generating skins and lofts from contours. As of early 2026, it remains a "must-have" for architects and designers dealing with non-planar faces and flowy geometry. Core Functionality
The plugin provides three primary methods for creating geometry: Loft by Spline
: Joins separate contours or profiles using smooth splines to create a continuous curved surface. Loft Along Path
: Generates a surface by sweeping one or two profiles along a user-defined curve or rail.
: Creates a face or "skin" by connecting three or four bordering contours, perfect for complex roofs or tensile structures. Pros & Cons Curviloft for Sketchup – 2 minute Tutorial Curviloft for Sketchup – 2 minute Tutorial Sketchup Style Using Curviloft #sketchup
Curviloft is a specialized SketchUp extension developed by Fredo6 that simplifies the creation of organic, non-linear geometry by generating surfaces from existing curves or contours. It is widely considered an essential tool for architects and 3D modelers who need to create complex "skins" or smooth transitions between different shapes. Core Functionality
The plugin is divided into three primary modeling modes, each tailored for different geometric challenges:
Loft by Spline: Connects separate contours (like a circle and a hexagon) with smooth, interpolated splines to create a continuous surface.
Loft Along Path: Generates a surface by following a specific "rail" or path defined by the user. It offers methods like Stretch, Offset, and Sweep to control the resulting shape's thickness and deformation.
Skinning: Creates a "skin" over a frame of four or more intersecting or adjacent edges, ideal for filling complex organic gaps. Key Features & Workflow
Interactive Preview Mode: After selecting your curves, the tool enters a preview state where you can adjust parameters and see the changes reflected in real-time before finalizing the geometry.
Pseudo-Quads Generation: Curviloft can generate "pseudo-quad" meshes, which are compatible with other advanced tools like QuadFaceTools for further mesh refinement.
Vertex Matching: It automatically attempts to line up vertices between contours of different segment counts, though users can manually add "separators" to control exactly where the mesh splits. Requirements & Installation
To use Curviloft, you must install several components through the SketchUcation ExtensionStore:
LibFredo6: The foundational shared library required for all Fredo6 plugins (v14.3b or above).
SketchUcation ExtensionStore: Necessary for managing the plugin and its license. Would you like a specific example (e
Restart: You must restart SketchUp after installation for the tools to load properly. Licensing Information
As of recent updates, Curviloft is a paid/licensed extension:
Free Trial: A 30-day full-feature trial period is available from the first usage. Perpetual License: Approximately $15 for a 3-seat license.
Bundle Option: It is included in the Fredo6Bundle (containing 8 plugins) for approximately $50.
For those looking for free alternatives, while less powerful, users often look toward tools like Simple Loft by Chris Fullmer or the native Extrude Tools by TIG.
Other plugins similar to Curviloft, RoundCorner and JointPushPull
Curviloft Plugin for SketchUp: Technical Report Curviloft is a specialized SketchUp extension developed by Fredo6 dedicated to lofting and skinning operations. It is primarily used for generating complex organic surfaces from sets of contours or frames that are difficult to model using native SketchUp tools. Core Functionality
Curviloft offers three primary tools for surface generation:
Loft by Spline: Joins separate contours (curves or lines) to create a smooth surface.
Loft Along Path: Follows a predefined path to generate a surface from multiple cross-sections.
Skinning: Creates a "skin" over a frame or a set of intersecting contours to form a solid-looking surface. Key Specifications & Requirements Developer: Fredo6.
Platform Compatibility: Available for both Windows and Mac OSX.
Software Version: Supports SketchUp 2017 and above, including recent 2024 versions.
Mandatory Dependencies: To function, Curviloft requires LibFredo6 (v14.3b or above) and the Sketchucation ExtensionStore (v4.4.0 or above).
Pricing: Currently a paid extension licensed under the Sketchucation SCFLicense. Free Trial: 30 days of full features.
Perpetual License: Approximately $15 for 3 seats, or available in the Fredo6Bundle (8 plugins) for $50. Installation & Usage
Download: Obtain the .rbz file from the SketchUcation Plugin Store.
Installation: Use the native SketchUp Extension Manager or the Sketchucation ExtensionStore to install the RBZ file.
Activation: You must quit and restart SketchUp after installation for the tools to load properly.
Access: Tools are located under Tools > Fredo6 Collection > Curviloft. Troubleshooting Common Issues
Curviloft: Mastering Organic Geometry in SketchUp SketchUp is renowned for its simplicity, yet its native tools often struggle with the complex, non-linear forms required for modern architecture and product design. Enter Curviloft, a transformative extension developed by Fredo6. Dedicated to "lofting" and "skinning," Curviloft allows users to bridge the gap between simple line work and sophisticated, organic surfaces. Core Functionalities
Curviloft simplifies organic modeling through three primary generation modes:
Loft by Spline: This mode connects separate contours or faces using smooth splines. It is ideal for creating flowing, continuous shapes where each segment transitions naturally into the next.
Loft along Path: This tool generates a surface by following a specific user-defined rail or curve. It offers multiple generation methods—such as Stretch, Offset, and Sweep—to ensure the resulting geometry maintains the correct thickness and orientation. This article was written for advanced intermediate SketchUp
Skinning: Perhaps the most powerful feature, skinning creates a surface over a frame or set of bordering contours. By selecting 3 or 4 contours, users can "patch" empty spaces with complex, curved geometry, effectively building "skins" over skeletal structures. Installation and Integration
The digital design world is moving toward real-time parametrics (Grasshopper, Blender Geometry Nodes). However, for the millions of architects, interior designers, and woodworkers who use SketchUp as their daily driver, Curviloft is essential.
It bridges the massive gap between "push/pull" and "subdivision modeling." It turns SketchUp from a "paper and pencil" tool into a "clay and rib" tool.
If you ever find yourself saying, "I wish I could smoothly morph this square into this circle," you do not need a new software. You need the Curviloft plugin for SketchUp.
Final Rating: 9.5/10 (Deducted half a point for the initial learning curve regarding vertex matching, but plus points for stability and speed.)
Where to buy: Visit the SketchUcation Store. Support TIG so he keeps updating this miracle tool for future versions of SketchUp.
This article was written for advanced intermediate SketchUp users. Always save your file before running complex lofting operations to prevent crashes with large geometry.
Curviloft is a powerful, free extension for SketchUp developed by Fredo6 that allows you to create complex curved surfaces (skins) from lines and contours. It is an essential tool for organic modeling, as it automates the creation of geometry that would be nearly impossible to draw manually. 1. Getting Started
To use Curviloft, you must install two components from the Sketchucation Extension Store: Curviloft Plugin: The main tool.
LibFredo6: A shared library required for all Fredo6 plugins to function. 2. The Three Primary Tools
Curviloft consists of three main modes, each accessible from its toolbar:
Loft by Spline: Creates a surface (skin) by connecting two or more separate contours or profiles. It "lofts" the space between them.
Loft along Path: Similar to SketchUp's native "Follow Me" tool, but much more advanced. It allows you to sweep a profile along a path while varying the scale or rotation of that profile along the way.
Skinning: Generates a surface over a closed wireframe of four or more edges. This is ideal for filling in gaps in complex organic shapes. 3. Basic Workflow
Select Your Lines: Use the Select tool to highlight the edges or contours you want to use. Activate Curviloft: Click one of the three Curviloft icons.
Preview & Adjust: A floating interface will appear. You can adjust settings like "Segment Number" to make the curve smoother or "Interpolation" to change how the surface flows between lines.
Finalize: Click outside the geometry or press Enter to generate the final surface. 4. Pro Tips for Better Results
Smooth Your Geometry: After creating a surface, use the Soften Edges tray (Window > Default Tray > Soften Edges) to hide the mesh lines and make the surface look seamless.
Check Line Continuity: Curviloft works best when your contours are clean. If a surface fails to generate, check for tiny gaps in your lines.
Inference Locking: Use the arrow keys while drawing your initial profiles to lock them to the Red, Green, or Blue axes, ensuring your organic shapes stay aligned correctly. Curviloft for SketchUp Tutorials
Here’s a comprehensive guide to Curviloft for SketchUp, one of the most powerful extensions for organic and complex surface modeling.
This requires no path curve. You simply select a series of parallel or radial profile curves. Curviloft connects them edge-to-edge.
Similar to SketchUp’s native Follow Me, but far more robust. You provide a path curve and one or more profile curves. Curviloft extrudes the profile(s) along the path while allowing rotation, scaling, and twisting.
This tool generates a surface by connecting a series of open or closed contours (curves). It is ideal for forms that change shape gradually from one profile to another, similar to a hull of a ship or a curved wall.