It seems you are asking about Curviloft 18 — likely a reference to the Curviloft extension (by Chris Fullmer) for SketchUp, possibly in the context of version 18 (e.g., SketchUp 2018 or a release around that period).

Below is a concise report covering what Curviloft is, its key features, compatibility, and typical usage as relevant to SketchUp 2018.

Benefits

Increased Productivity: With its intuitive design and powerful features, Curviloft 18 enables users to complete projects more efficiently.
Enhanced Creativity: The software's flexibility and advanced capabilities open new avenues for creative expression and innovation.
Precision and Accuracy: Achieve high levels of precision and accuracy in your designs, crucial for professional applications.

1. Enhanced Bezier Curve Editing

The core of CurviLoft 18 is its robust curve engine. Users can draw complex Bezier and Spline curves directly in the 3D workspace. Version 18 introduced smoother handles and better snapping mechanics, reducing the "flickering" seen in earlier builds.

Conclusion: Download CurviLoft 18 Today

If you have made it this far, you understand that CurviLoft 18 is not just a plugin; it is a philosophy shift. It frees you from the tyranny of 90-degree angles and flat planes. It transforms SketchUp from a drafting board into a sculptor's studio.

To get started:

Update SketchUp to at least version 2021.
Search for "Fredo6 CurviLoft" on Sketchucation or the Extension Warehouse.
Watch Fredo6’s official YouTube tutorials (they are dry but incredibly detailed).
Spend one hour lopping random curves – you will be a master by the end of the day.

Stop fighting curves. Start lopping them. CurviLoft 18 is your key to organic design.

Keywords used: CurviLoft 18, Curviloft 18, SketchUp extension, lofting tool, Fredo6, organic modeling, surface skinning, 3D curves.

Note: Curviloft requires LibFredo6 (also by Fredo6). Install both.

CurviLoft 18: The Ultimate Guide to SketchUp’s Most Powerful Organic Modeling Tool

3. Key Settings Panel (after clicking a tool)

Surface type: Mesh, Quad mesh, or Subdivided.
Thickness (if Thickened mode): Enter a value (e.g., 0.5 cm).
Smoothness: Higher = smoother but heavier.
Reverse direction: Flips normals if surface is inside-out.
Delete original curves checkbox.

1. Native Support for the New SketchUp Graphics Engine

SketchUp 2021 and later introduced a new graphics pipeline. CurviLoft 18 leverages this for real-time previews. As you drag your mouse to adjust a loft, the surface updates instantly without the white "loading" flash.

1. Use Groups Religiously

CurviLoft 18 treats any geometry not inside a group as "active." If you loft raw curves, you cannot delete the curves without deleting the surface. Always group your source curves before lofting, or check "Preserve curves" in the options.