Function intersect_triangle 

pub fn intersect_triangle(
    ray: &Ray,
    vertices: [Vector3D; 3],
) -> Option<(f64, Vector3D)>

Intersects a ray with a triangle using the Moller-Trumbore algorithm.

The test is two-sided: a hit on either face counts, and the returned normal is flipped when needed so that it always faces against the ray direction, making back-face hits usable for shading. A ray parallel to the triangle plane yields None.

The ray’s own t_min/t_max are deliberately not consulted: this free function reports the raw distance along the ray however far away the triangle is. Ray::intersect_triangle is the range-clamped variant and the two must stay distinguishable at the call site.

Arguments

• &Ray - The ray whose origin and direction are tested; its parameter range is ignored.
• [Vector3D; 3] - The three triangle vertices in winding order.

Returns

• Option<(f64, Vector3D)> - The hit distance along the ray and the unit surface normal oriented against the ray direction, or None on miss.