Function self_union 

pub fn self_union(
    model: &mut Model,
    solid: &Shape,
    tol: Tolerances,
) -> OgeomResult<Built>

The union of the material solid encloses, where its boundary passes through itself: the regions it encloses twice made one, and its faces cut where they cross and trimmed back to the union’s boundary.

A solid whose boundary does not pass through itself (what self_crossings finds) comes back as it is, with an empty history. A region the boundary winds round negatively, enclosed inside out, is not material and is left out.

Errors

OgeomError::Construction if solid is not a solid; OgeomError::NotDone where a face passes through itself or through a face it shares an edge or a corner with (only faces apart are split against each other), where a piece’s two sides cannot be read, or where the kept pieces do not close or the union still crosses itself; and as the boolean’s operations.