public override bool scatter(Ray rayIn, ShadeRec sr, out SColor Attenuation, out Ray rayScatter)
{
Vector3D reflectDir = Ray.getReflectDir(rayIn.Direction, sr.Normal);
reflectDir.Normalize();
rayScatter = new Ray(sr.HitPoint, reflectDir + fuzz * Vector3D.RandomInUnitSphere());
Attenuation = texture.getColor(sr.U, sr.V, sr.HitPoint);
return((rayScatter.Direction * sr.Normal) > 0);
}
public override bool scatter(Ray rayIn, ShadeRec sr, out SColor Attenuation, out Ray rayScatter)
{
Attenuation = new SColor(1, 1, 1);
Vector3D outward_normal;
Vector3D refracted;
Vector3D reflected = Ray.getReflectDir(rayIn.Direction, sr.Normal);
double eta, cos, reflect_prob;
if (rayIn.Direction * sr.Normal > 0)
{
outward_normal = -1 * sr.Normal;
eta = _RI;
cos = _RI * (rayIn.Direction * sr.Normal) / rayIn.Direction.Magnitude();
}
else
{
outward_normal = sr.Normal;
eta = 1.0 / _RI;
cos = -1.0 * (rayIn.Direction * sr.Normal) / rayIn.Direction.Magnitude();
}
if (refract(rayIn.Direction, outward_normal, eta, out refracted))
{
reflect_prob = schlick(cos, eta);
rayScatter = new Ray(sr.HitPoint, refracted);
}
else
{
reflect_prob = 1.0;
rayScatter = new Ray(sr.HitPoint, reflected);
}
if (Form2.random() < reflect_prob)
{
rayScatter = new Ray(sr.HitPoint, reflected);
}
else
{
rayScatter = new Ray(sr.HitPoint, refracted);
}
return(true);
}
