How to create an offset spline on surface curve in SolidWorks

This video goes through two techniques to achieve an offset curve of a spline on surface.

1. Surfacing techniques
1.1 Ruled surface - Normal to surface
1.2 Extend surface
1.3 Offset surface
1.4 Intersection curve

2. Projection
2.1 Project spline on surface to appropriate plane (convert entities)
2.2 Use offset entities on 2d sketch
2.3 Use project curve to (sketch on faces) to project offset curve back onto original surface.

In addition to the two techniques, the video also outlines a situation where the projection method will give undesirable results.

Видео How to create an offset spline on surface curve in SolidWorks канала Intercad