Editing Convex hull (section)

===Space curves===
[[File:Oloid structure.svg|thumb|An [[oloid]], the convex hull of two circles in 3d space]]
For the convex hull of a [[space curve]] or finite set of space curves in general position in three-dimensional space, the parts of the boundary away from the curves are [[Developable surface|developable]] and [[ruled surface]]s.{{sfnp|Sedykh|1981}} Examples include the [[oloid]], the convex hull of two circles in perpendicular planes, each passing through the other's center,{{sfnp|Dirnböck|Stachel|1997}} the [[sphericon]], the convex hull of two semicircles in perpendicular planes with a common center, and D-forms, the convex shapes obtained from [[Alexandrov's uniqueness theorem]] for a surface formed by gluing together two planar convex sets of equal perimeter.{{sfnp|Seaton|2017}}