intersect_ray_sphere.hpp

#ifndef PASTELGEOMETRY_INTERSECT_RAY_SPHERE_HPP
#define PASTELGEOMETRY_INTERSECT_RAY_SPHERE_HPP

#include "pastel/geometry/intersect/intersect_ray_sphere.h"
#include "pastel/geometry/intersect/intersect_line_sphere.h"

namespace Pastel
{

    template <typename Real, integer N>
    integer intersect(
        const Ray<Real, N>& ray,
        const Sphere<Real, N>& sphere,
        Vector<Real, 2>& hitList)
    {
        Vector<Real, 2> t;
        if (!intersect(ray.line(), sphere, t))
        {
            return 0;
        }

        if (t[1] < 0)
        {
            return 0;
        }

        if (t[0] < 0)
        {
            hitList[0] = t[1];
            return 1;
        }

        hitList = t;
        return 2;
    }

}

#endif