public override bool Scatter(Ray r, HitRecord rec, out Vec3f attenuation, out Ray Scattered, Random drand)
{
Vec3f reflected = Vec3f.Reflect(r.Direction.GetNormal(), rec.Normal);
Scattered = new Ray(rec.Point, reflected + Fuzz * RayTrace1.RandomInUnitSphere(drand));
attenuation = Albedo;
return(Vec3f.Dot(Scattered.Direction, rec.Normal) > 0);
}
public override bool Scatter(Ray r, HitRecord rec, out Vec3f attenuation, out Ray Scattered, Random drand)
{
Vec3f outward_normal;
Vec3f reflected = Vec3f.Reflect(r.Direction, rec.Normal);
float ni_over_nt;
// try 1,1,0 to see color shift, then change to 1,1,1 and see differance.
attenuation = new Vec3f(1.0f, 1.0f, 1.0f);
Vec3f refracted;
float reflect_prob;
float cosine;
if (Vec3f.Dot(r.Direction, rec.Normal) > 0)
{
outward_normal = -rec.Normal;
ni_over_nt = RefIndex;
cosine = RefIndex * Vec3f.Dot(r.Direction, rec.Normal) / r.Direction.GetLength();
}
else
{
outward_normal = rec.Normal;
ni_over_nt = 1.0f / RefIndex;
cosine = -Vec3f.Dot(r.Direction, rec.Normal) / r.Direction.GetLength();
}
if (Vec3f.Refract(r.Direction, outward_normal, ni_over_nt, out refracted))
{
reflect_prob = Schlick(cosine, RefIndex);
//Scattered = new Ray(rec.Point, refracted);
}
else
{
Scattered = new Ray(rec.Point, reflected); // comment out this line?
reflect_prob = 1.0f;
//return false;
}
if (drand.NextDouble() < reflect_prob)
{
Scattered = new Ray(rec.Point, reflected);
}
else
{
Scattered = new Ray(rec.Point, refracted);
}
return(true);
}