Function boundary_clearance 

pub fn boundary_clearance(
    a: &ExactBRep,
    b: &ExactBRep,
    limit: Scalar,
    tolerance: Tolerance,
) -> Result<(DistanceBounds, Clearance), ExactMeasureError>

Refine the distance only until it clears limit.

Like an accuracy below the rounding floor, a limit within the floor of the distance settles at the floor and is never decided: the result is Clearance::Indeterminate.

Errors

As boundary_distance.