Im trying to fill this trimmed corner with a surface hat should be g2 on all 4 sides. It always ends up with a crazy high degree… I uses srf from 4 edge curves. Sweep is equally bad, if not worse. Why does that happen, the other surfaces should be fine in terms of degree count?
You mean the point counts are high, not the degree. Some commands just don’t care and ‘refit’ every input, the ones that can make ‘simple’ surfaces require the input to not simply have the same point count but similar underlying structure that you can’t see.
You know how Apple makes (made?) those corners? Brute-force point-editing for days until it’s perfect.
To expand on Jim’s comment, those surfaces are multi-span, not single span. Multi-span surfaces have more control points than single span surfaces of the same degree.
The root cause of the large number of control points is the trimmed edge of the upper surface. When a surface is created using a trimmed surface edge as input, the trim curve for the edge is used. To see the complexity of the trimmed edge DupEdge the edge and turn on control points for the resulting curve.