Locate the Curviloft.rbz file on your computer and select . Restart SketchUp to ensure the tools load correctly. Licensing and Cost
3.4. Curvature continuity Enforce C^2 continuity by matching derivatives up to second order between adjacent spline segments. Use Hermite data: positions, tangents, curvature vectors. For surface patches, match mixed partials S_uv, S_vv at boundaries.