Guide curves (A) (B) allow you to control the shape of a lofted or swept surface between the cross sections. You can use a sketch, the edge of an adjacent surface, or a curve that has been projected onto a surface as guide curves.
The shape of a lofted surface with the same cross section elements changes depending on whether there are no guide curves, one guide curve, or more than one guide curves.
When you use a sketch as a guide curve, you can edit the sketch to change the shape of the feature.
Every guide curve must touch every cross section in the loft.
Guide curves may extend beyond either end of the loft. The loft will begin and end at the end cross sections.
All guide curves must be closed for closed lofts.
Guide curves can meet in a single point on the first or last section. They cannot meet at interior sections.
Guide curves cannot cross one another.