// does the recursive (shadow rays & recursive/glossy rays) work
Vec3f RayTracer::TraceRay(const Ray &ray, Hit &hit, int bounce_count) const
{
hit = Hit();
bool intersect = CastRay(ray,hit,false);
Vec3f answer(args->background_color_linear);
if (intersect == true) {
const Material *m = hit.getMaterial();
assert (m != NULL);
// rays coming from the light source are set to white, don't bother to ray trace further.
if (m->getEmittedColor().Length() > 0.001) {
answer = Vec3f(1,1,1);
} else {
// ambient light
answer = args->ambient_light_linear *
m->getDiffuseColor(hit.get_s(),hit.get_t());
// Shadows
answer += shadows(ray, hit);
// Reflections
Vec3f reflectiveColor = m->getReflectiveColor();
double roughness = m->getRoughness();
if (bounce_count > 0 && reflectiveColor.Length() > MIN_COLOR_LEN) {
answer += reflectiveColor * reflections(ray, hit, bounce_count, roughness);
}
}
}
return answer;
}
void reflections(t_env *rt, t_vector ray, t_vector orig, int rr)
{
t_vector n;
t_vector tmp_reflect;
intersection(rt, ray, orig);
rt->inter = calcul_ptinter(orig, ray, rt->t);
calcul_light(rt, rt->i2);
if (rt->i2 != -1)
{
calcul_reflec(rt, &n, &tmp_reflect, &ray);
orig = rt->inter;
}
rt->color2.r = rt->color.r * rt->first_reflec + rt->color2.r *
(1 - rt->first_reflec);
rt->color2.g = rt->color.g * rt->first_reflec + rt->color2.g *
(1 - rt->first_reflec);
rt->color2.b = rt->color.b * rt->first_reflec + rt->color2.b *
(1 - rt->first_reflec);
if (rt->i2 != -1 && rr < rt->max_reflect &&
rt->object[rt->i2].material.shiny)
reflections(rt, ray, orig, rr + 1);
}
