const Point3 = @import("vec3.zig").Point3;
const Vec3 = @import("vec3.zig").Vec3;
const Ray = @import("ray.zig").Ray;

pub const HitRecord = struct {
    p: Point3,
    normal: Vec3,
    t: f32,
    front_face: bool,

    pub fn setFaceNormal(hit: *HitRecord, ray: Ray, outward_normal: Vec3) void {
        const front_face = Vec3.dot(ray.direction, outward_normal) < 0;
        hit.*.front_face = front_face;
        if (front_face) {
            hit.*.normal = outward_normal;
        } else {
            const origin = Vec3{};
            hit.*.normal = origin.sub(outward_normal);
        }
    }
};