Function intersect_plane_sphere 

pub fn intersect_plane_sphere(
    sphere: &SphericalSurface,
    normal: Vec3,
    d: f64,
) -> Result<Vec<IntersectionCurve>, MathError>

Intersect a plane with a spherical surface.

The intersection of a plane with a sphere is a circle (or empty/point). Computes the circle center, radius, and samples points on it.

Errors

Returns an error if curve fitting fails.