pub fn grade_corners3(curve: &Curve3, angle: f64) -> Result<Vec<f64>, GeomError>Expand description
Where an elevated or banked curve turns a corner: the seams (of its
profile, and of a banked curve’s pivot) across which the grade of its
point path jumps by more than angle radians, ascending.
A chain plan is tangent-continuous at its joins by construction, so only the vertical part can kink. Read from the laws on either side of each seam, not from nearby samples. Empty for every other family.
§Errors
The laws’ refusals at a seam, by name.