pub const ANGULAR: f64 = 1e-12;Expand description
Two directions closer than this in angle are parallel. Dimensionless.
Deliberately tight: near the limit of what f64 can distinguish. It is the
right threshold for comparing directions that were stored, such as two
surface axes read back from a model. It is the wrong one for comparing
directions computed through subtraction of nearby coordinates, where the
input’s own rounding is already larger; such a comparison needs a bound
derived from the magnitudes involved.