While I create surface sweep using guide curves an error saying " The feature could not be created because it would produce self intersecting geometry.".im using SW2017!. I have created a ellipse at a end of a spline and pierced the centre of ellipse to end of spline and used a intersection curve as guild curve. But when I select the guide curve and sweep the above error appears. But without the guild curve with just the spline for path the sweep is created. Can't we use 3d curve or intersection curve as guide curve??..