/* * DoRayMe - a quick and dirty Raytracer * Sphere implementation * * Created by Manoƫl Trapier * Copyright (c) 2020 986-Studio. * */ #include #include #include #include #include Intersect Sphere::intersect(Ray r) { Intersect ret; double a, b, c, discriminant; Tuple sphere_to_ray = r.origin - Point(0, 0, 0); a = r.direction.dot(r.direction); b = 2 * r.direction.dot(sphere_to_ray); c = sphere_to_ray.dot(sphere_to_ray) - 1; discriminant = b * b - 4 * a * c; if (discriminant >= 0) { ret.add(newIntersection((-b - sqrt(discriminant)) / (2 * a), this)); ret.add(newIntersection((-b + sqrt(discriminant)) / (2 * a), this)); } return ret; }