Function ncollide2d::query::time_of_impact

pub fn time_of_impact<N: RealField>(
    m1: &Isometry<N>, 
    vel1: &Vector<N>, 
    g1: &dyn Shape<N>, 
    m2: &Isometry<N>, 
    vel2: &Vector<N>, 
    g2: &dyn Shape<N>, 
    max_toi: N, 
    target_distance: N
) -> Option<TOI<N>>

Computes the smallest time at with two shapes under translational movement are separated by a distance smaller or equal to distance.

Returns 0.0 if the objects are touching or penetrating.