Function ncollide2d::query::distance

pub fn distance<N: RealField>(
    m1: &Isometry<N>, 
    g1: &dyn Shape<N>, 
    m2: &Isometry<N>, 
    g2: &dyn Shape<N>
) -> N

Computes the minimum distance separating two shapes.

Returns 0.0 if the objects are touching or penetrating.