When I sweep a circle with one closed polyline x-section, it seems like sometimes the resulting closed polysurface is broken into 4 segments with seams at the quads as depicted in the picture attached.
When I sweep two rails, the result is a single surface. I can’t explain why there is this difference in the outcomes. Can someone explain this to me. I’m uploading a sample file too.
Surfacing Question.3dm (281.2 KB)