pub fn trim_intrinsic3(
curve: &Intrinsic3,
start: f64,
end: f64,
) -> Result<Intrinsic3, GeomError>Expand description
Restrict a space curve to [start, end] of its arc length.
Exact in shape: the laws are re-anchored, not refitted. The returned curve
has length end - start and its own start frame is the base curve’s frame
at start.