geomcore 0.6.0

A pure, standalone geometric kernel for CAD-grade curves and surfaces: parametric evaluation, transformations, and curve-on-surface parametrization.
Documentation 
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//! Analytic intersection result types.
//!
//! The `intersect_*` methods on the analytic surfaces return these enums:
//! the intersecting curve on success, or an explicit classification when
//! the pair is tangent, disjoint, parallel, or coincident. Tangency and
//! coincidence are decided with [`crate::Tolerance`], so near-degenerate
//! configurations classify robustly instead of collapsing to noise.

use crate::{Circle3D, Line3D, Point3D};

/// Result of intersecting two planes.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum PlanePlaneIntersection {
    /// The planes meet in a line.
    Line(Line3D),
    /// The planes are parallel but distinct.
    Parallel,
    /// The planes coincide.
    Coincident,
}

/// Result of intersecting a plane with a sphere.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum PlaneSphereIntersection {
    /// The plane cuts the sphere in a circle.
    Circle(Circle3D),
    /// The plane grazes the sphere in a single point.
    TangentPoint(Point3D),
    /// The plane misses the sphere.
    Empty,
}

/// Result of intersecting two spheres.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum SphereSphereIntersection {
    /// The spheres meet in a circle.
    Circle(Circle3D),
    /// The spheres touch in a single point.
    TangentPoint(Point3D),
    /// The spheres are separate, one inside the other without contact, or
    /// concentric with different radii.
    Empty,
    /// The spheres coincide (same center and radius within tolerance).
    Coincident,
}