pub fn quadratic_roots(a: f64, b: f64, c: f64) -> Vec<f64>Expand description
Real roots of a x^2 + b x + c.
Uses the citardauq form for whichever root would otherwise be computed as a
difference of nearly equal numbers. The schoolbook formula loses most of its
precision for the smaller root when b^2 >> 4ac, which is the common case
for a ray grazing a sphere.