public bool Scatter(Ray ray, HitInfo hit, out Vec3 attenuation, out Ray scattered)
{
attenuation = albedo;
double nu;
double cosine;
Vec3 norm;
Vec3 reflected = Vec3.Reflect(ray.Direction, hit.normal);
double reflect_prob;
if (Vec3.Dot(hit.normal, ray.Direction) > 0)
{
norm = -hit.normal;
nu = ri;
cosine = ri * Vec3.Dot(ray.Direction, hit.normal) / ray.Direction.Length;
}
else
{
norm = hit.normal;
nu = 1.0 / ri;
cosine = -Vec3.Dot(ray.Direction, hit.normal) / ray.Direction.Length;
}
reflect_prob = Refract(ray.Direction, norm, nu, out Vec3 refracted) ? SchlickReflectivity(cosine) : 1.0;
scattered.A = hit.hitpoint;
scattered.B = reflect_prob > rng.NextDouble() ? reflected : refracted;
return(true);
}
public bool Scatter(Ray ray, HitInfo hit, out Vec3 attenuation, out Ray scattered)
{
Vec3 target_dir = Vec3.Reflect(ray.Direction, hit.normal) + rng.GetRandomPointInUnitSphere() * fuzziness;
scattered.A = hit.hitpoint;
scattered.B = target_dir;
attenuation = albedo;
return(Vec3.Dot(scattered.Direction, hit.normal) > 0);
}
